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2014/10/15 ¤U¤È 10:04:33
iphone Programming Glossary: becauseHow to check for an active Internet Connection on iPhone SDK? http://stackoverflow.com/questions/1083701/how-to-check-for-an-active-internet-connection-on-iphone-sdk I came up with a way to do this using an NSURL . The way I did it seems a bit unreliable because even Google could one day be down and relying on a 3rd party seems bad and while I could check to see..
How to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present when the keyboard comes up. Even though it's not needed I feel like it provides a better interface because then the user can scroll and change textboxes for example. I've got it working where I change the frame..
How to add a breakpoint to objc_exception_throw? http://stackoverflow.com/questions/1163981/how-to-add-a-breakpoint-to-objc-exception-throw To do this go to Run Show Breakpoints and create two global breakpoints I do them globally because they are so useful in all my applications . The first should be named objc_exception_throw and its location..
Add UIPickerView & a Button in Action sheet - How? http://stackoverflow.com/questions/1262574/add-uipickerview-a-button-in-action-sheet-how ways to accomplish this. Here's one way that I just implemented in a current project. It's nice because I can reuse it between 5 or 6 different screens where I all users to select from a list of options...
How to store custom objects in NSUserDefaults http://stackoverflow.com/questions/2315948/how-to-store-custom-objects-in-nsuserdefaults Thank you but I'm still having some issues. Basically the code crashes now and I'm not sure why because it doesn't give any errors. Perhaps I'm missing something basic and I'm just too tired but we'll see...
How do I associate file types with an iPhone application? http://stackoverflow.com/questions/2774343/how-do-i-associate-file-types-with-an-iphone-application in Apple's Uniform Type Identifiers Overview . Those guides reside in the Mac developer center because this capability has been ported across from the Mac. One of the UTIs used in the above example was system..
How can I send mail from an iPhone application http://stackoverflow.com/questions/310946/how-can-i-send-mail-from-an-iphone-application I have heard that the iOS SDK doesn't have an email API. I don't want to use the following code because it will exit my application NSString url NSString stringWithString @ mailto foo@example.com cc bar@example.com..
How do I apply a perspective transform to a UIView? http://stackoverflow.com/questions/347721/how-do-i-apply-a-perspective-transform-to-a-uiview don't have any sublayers don't worry about it. I use the sublayerTransform in my example simply because there are two CALayers contained within the one layer that I'm rotating. share improve this answer..
How do you use NSAttributedString? http://stackoverflow.com/questions/3482346/how-do-you-use-nsattributedstring would like to have a string that has three colours. The reason I don't use 3 separate NSStrings is because the length of each of the three NSAttributedString substrings will be changing often and so I would..
Prefixing property names with an underscore in Objective C [duplicate] http://stackoverflow.com/questions/3521254/prefixing-property-names-with-an-underscore-in-objective-c in a cocoa objective c class work I've always avoided underscores in my variable names perhaps because its just not what was done back in my learning Java in college days. So when I define a property in.. @synthesize myStringProperty _myStringProperty Should I get over my aversion to the underscore because that is the one way it should be done is there a good reason for this style being the preferred one..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints object containg the CGPDFDocumentRef . I synchronize the part where I access the pdfDoc property because I release it and recreate it when receiving memoryWarnings. It seems that the CGPDFDocumentRef object..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll TableView. I want to make sure I'm on the right path before I change too much code. I'm confused because so many of the examples are array based instead of CoreData. Here are some questions Do I need to have..
Change User Agent in UIWebView (iPhone SDK) http://stackoverflow.com/questions/478387/change-user-agent-in-uiwebview-iphone-sdk edits on this post if you need methods that work in versions of iOS before 4.3 5.0. Note that because of the extensive edits the following comments other answers on this page may not make sense. This is..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c with respondsToSelector before calling a particular method on it. Apple recommends this method because it is more precise doesn't mess with NSObject and can provide better tool support. Speed Optimizations..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c and free is that any given object doesn't need to worry about other parts of the system crashing because you've freed memory they were using. Assuming everyone is playing along and retaining releasing according..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown may cause a leak because its selector is unknown I'm getting the following warning by the ARC compiler performSelector may cause.. is unknown I'm getting the following warning by the ARC compiler performSelector may cause a leak because its selector is unknown . Here's what I'm doing _controller performSelector NSSelectorFromString @ someMethod.. declared statically _controller performSelector @selector someMethod The reason for this is because the compiler actually is able to record all of the information about the selector and the object during..
iPhone Data Usage Tracking/Monitoring http://stackoverflow.com/questions/7946699/iphone-data-usage-tracking-monitoring . yes. Then device is connected via WiFi and doesn't use internet if_iobytes values still come because this method provides network bytes exchanges and not just internet . NSArray getDataCounters BOOL success..
How to convert time to the timezone of the iPhone device? http://stackoverflow.com/questions/1081647/how-to-convert-time-to-the-timezone-of-the-iphone-device device I have a time in EST timezone it is done using the NOW function on the mysql server. Because my server is located in EST the time stored is in EST. When I retrieve it from my app on the iPhone..
Declaration/definition of variables locations in ObjectiveC? http://stackoverflow.com/questions/12632285/declaration-definition-of-variables-locations-in-objectivec int v myClass myVar assuming myClass is an object of type MyClass. myClass setMyVar v 1 Because manually declaring and implementing every accessor method was quite annoying @property and @synthesize..
Changing my CALayer's anchorPoint moves the view http://stackoverflow.com/questions/1968017/changing-my-calayers-anchorpoint-moves-the-view are then setting the location of the center of the layer in its superlayer's coordinate system. Because the position is relative to the anchorPoint of the layer changing that anchorPoint while maintaining..
Notification of or detecting screenshot being taken? http://stackoverflow.com/questions/2121970/notification-of-or-detecting-screenshot-being-taken their finger on the screen for the image to show then I don't think they can create screenshots. Because as soon as you press the home lock keys to actually take the screenshot the screen seems to behave as..
Using SSL in an iPhone App - Export Compliance http://stackoverflow.com/questions/2128927/using-ssl-in-an-iphone-app-export-compliance Compliance I'm looking at creating an iPhone app that will communicate with a REST Web service. Because some user sensitive data name address age etc will be transmitted I'm looking at securing the connections..
What is the best way to enter numeric values with decimal points? http://stackoverflow.com/questions/276382/what-is-the-best-way-to-enter-numeric-values-with-decimal-points more elegant solution happens to also be the simplest. You don't need a decimal separator key Why Because you can simply infer it from the user's input. For instance in the US locale when you what to enter..
UIButton inside a view that has a UITapGestureRecognizer http://stackoverflow.com/questions/3344341/uibutton-inside-a-view-that-has-a-uitapgesturerecognizer still get highlighted. I can't just remove the UITapGestureRecognizer after I received it's tap. Because with it the new view can also be removed. Means I want a behavior like the fullscreen vide controls..
http://stackoverflow.com/questions/412982/iphone-unzip-code a look at the first two bytes of the file. If it is 'PK' it's WinZip if it's 0x1F8B it's gZip. Because this is iPhone specific have a look at this iPhone SDK forum discussion where miniZip is mentioned...
Difference between [NSMutableArray array] vs [[NSMutableArray alloc] init] http://stackoverflow.com/questions/5423211/difference-between-nsmutablearray-array-vs-nsmutablearray-alloc-init with NSMutableArray array NSMutableArray array and NSMutableArray array NSMutableArray alloc init Because in the beginning I was declaring all my arrays with alloc and if in the end of a certain function I.. release anything. Thanks iphone objective c ios ipad memory leaks share improve this question Because in the beginning i was declaring all my arrays with alloc and if in the end of a certain function i..
How to check for an active Internet Connection on iPhone SDK? http://stackoverflow.com/questions/1083701/how-to-check-for-an-active-internet-connection-on-iphone-sdk an Internet connection on the iPhone using the Cocoa Touch libraries. I came up with a way to do this using an NSURL . The way I did it seems a bit unreliable because even Google could one day be down and relying on a 3rd party seems bad and while I could check to see for a response from some other websites if Google didn't respond..
How to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present as normal. Edit I am adding the scroll bar just for when the keyboard comes up. Even though it's not needed I feel like it provides a better interface because then the user can scroll and change textboxes for example. I've got it working where I change the frame size of the UIScrollView when the keyboard goes up and down...
How to add a breakpoint to objc_exception_throw? http://stackoverflow.com/questions/1163981/how-to-add-a-breakpoint-to-objc-exception-throw add two breakpoints you should be able to debug these exceptions. To do this go to Run Show Breakpoints and create two global breakpoints I do them globally because they are so useful in all my applications . The first should be named objc_exception_throw and its location should be libobjc.A.dylib . The second should be NSException..
Add UIPickerView & a Button in Action sheet - How? http://stackoverflow.com/questions/1262574/add-uipickerview-a-button-in-action-sheet-how view controller containing a simple tableview. There are many ways to accomplish this. Here's one way that I just implemented in a current project. It's nice because I can reuse it between 5 or 6 different screens where I all users to select from a list of options. Create a new UITableViewController subclass SimpleTableViewController..
How to store custom objects in NSUserDefaults http://stackoverflow.com/questions/2315948/how-to-store-custom-objects-in-nsuserdefaults Thank you EDIT Alright so I worked with the code given below Thank you but I'm still having some issues. Basically the code crashes now and I'm not sure why because it doesn't give any errors. Perhaps I'm missing something basic and I'm just too tired but we'll see. Here is the implementation of my Custom class Player @interface..
How do I associate file types with an iPhone application? http://stackoverflow.com/questions/2774343/how-do-i-associate-file-types-with-an-iphone-application Identifiers Reference . Even more detail on UTIs can be found in Apple's Uniform Type Identifiers Overview . Those guides reside in the Mac developer center because this capability has been ported across from the Mac. One of the UTIs used in the above example was system defined but the other was an application specific UTI...
How can I send mail from an iPhone application http://stackoverflow.com/questions/310946/how-can-i-send-mail-from-an-iphone-application I want to send an email from my iPhone application. I have heard that the iOS SDK doesn't have an email API. I don't want to use the following code because it will exit my application NSString url NSString stringWithString @ mailto foo@example.com cc bar@example.com subject Greetings 20from 20Cupertino body Wish 20you..
How do I apply a perspective transform to a UIView? http://stackoverflow.com/questions/347721/how-do-i-apply-a-perspective-transform-to-a-uiview
How do you use NSAttributedString? http://stackoverflow.com/questions/3482346/how-do-you-use-nsattributedstring is available on the iPhone as of iPhone SDK 4.0 beta . I would like to have a string that has three colours. The reason I don't use 3 separate NSStrings is because the length of each of the three NSAttributedString substrings will be changing often and so I would prefer not to use any calculations to re position 3 separate..
Prefixing property names with an underscore in Objective C [duplicate] http://stackoverflow.com/questions/3521254/prefixing-property-names-with-an-underscore-in-objective-c Duplicate How does an underscore in front of a variable in a cocoa objective c class work I've always avoided underscores in my variable names perhaps because its just not what was done back in my learning Java in college days. So when I define a property in Objective C this is what I naturally do. In the header @interface.. nonatomic copy NSString myStringProperty In the implementation @synthesize myStringProperty _myStringProperty Should I get over my aversion to the underscore because that is the one way it should be done is there a good reason for this style being the preferred one iphone objective c coding style share improve this question..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints CGContextDrawPDFPage context pdfPage issue is the object containg the CGPDFDocumentRef . I synchronize the part where I access the pdfDoc property because I release it and recreate it when receiving memoryWarnings. It seems that the CGPDFDocumentRef object do some internal caching that I did not find how to get rid..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll with a predicate to retrieve the data for the primary TableView. I want to make sure I'm on the right path before I change too much code. I'm confused because so many of the examples are array based instead of CoreData. Here are some questions Do I need to have a second NSFetchedResultsController that retrieves only the..
Change User Agent in UIWebView (iPhone SDK) http://stackoverflow.com/questions/478387/change-user-agent-in-uiwebview-iphone-sdk standardUserDefaults registerDefaults dictionary See previous edits on this post if you need methods that work in versions of iOS before 4.3 5.0. Note that because of the extensive edits the following comments other answers on this page may not make sense. This is a four year old question after all. share improve this answer..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c as @optional like most delegate methods you still need to check with respondsToSelector before calling a particular method on it. Apple recommends this method because it is more precise doesn't mess with NSObject and can provide better tool support. Speed Optimizations Instead of checking whether a delegate responds to a selector..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c freed by the system. The basic way this differs from malloc and free is that any given object doesn't need to worry about other parts of the system crashing because you've freed memory they were using. Assuming everyone is playing along and retaining releasing according to the rules when one piece of code retains and then releases..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown may cause a leak because its selector is unknown I'm getting the following warning by the ARC compiler performSelector may cause a leak because its selector is unknown . Here's what I'm.. may cause a leak because its selector is unknown I'm getting the following warning by the ARC compiler performSelector may cause a leak because its selector is unknown . Here's what I'm doing _controller performSelector NSSelectorFromString @ someMethod Why do I get this warning I understand the compiler.. Interestingly the compiler will not complain about selectors declared statically _controller performSelector @selector someMethod The reason for this is because the compiler actually is able to record all of the information about the selector and the object during compilation. It doesn't need to make any assumptions about..
iPhone Data Usage Tracking/Monitoring http://stackoverflow.com/questions/7946699/iphone-data-usage-tracking-monitoring ifi_ipackets are shown just for lo0 i think its main interface . yes. Then device is connected via WiFi and doesn't use internet if_iobytes values still come because this method provides network bytes exchanges and not just internet . NSArray getDataCounters BOOL success struct ifaddrs addrs const struct ifaddrs cursor const..
How to convert time to the timezone of the iPhone device? http://stackoverflow.com/questions/1081647/how-to-convert-time-to-the-timezone-of-the-iphone-device to convert time to the timezone of the iPhone device I have a time in EST timezone it is done using the NOW function on the mysql server. Because my server is located in EST the time stored is in EST. When I retrieve it from my app on the iPhone I need to display it in the correct time zone of the user. How..
Declaration/definition of variables locations in ObjectiveC? http://stackoverflow.com/questions/12632285/declaration-definition-of-variables-locations-in-objectivec usual square bracket syntax to send messages call methods OtherClass.m int v myClass myVar assuming myClass is an object of type MyClass. myClass setMyVar v 1 Because manually declaring and implementing every accessor method was quite annoying @property and @synthesize were introduced to automatically generate the accessor methods..
Changing my CALayer's anchorPoint moves the view http://stackoverflow.com/questions/1968017/changing-my-calayers-anchorpoint-moves-the-view of the layer. When you set the position of the layer you are then setting the location of the center of the layer in its superlayer's coordinate system. Because the position is relative to the anchorPoint of the layer changing that anchorPoint while maintaining the same position moves the layer. In order to prevent this..
Notification of or detecting screenshot being taken? http://stackoverflow.com/questions/2121970/notification-of-or-detecting-screenshot-being-taken interface guidelines I'm sure. If you force the user to have their finger on the screen for the image to show then I don't think they can create screenshots. Because as soon as you press the home lock keys to actually take the screenshot the screen seems to behave as if there are no fingers touching it. Try taking a screenshot..
Using SSL in an iPhone App - Export Compliance http://stackoverflow.com/questions/2128927/using-ssl-in-an-iphone-app-export-compliance SSL in an iPhone App Export Compliance I'm looking at creating an iPhone app that will communicate with a REST Web service. Because some user sensitive data name address age etc will be transmitted I'm looking at securing the connections with SSL. However on my previous escapades into App Store..
What is the best way to enter numeric values with decimal points? http://stackoverflow.com/questions/276382/what-is-the-best-way-to-enter-numeric-values-with-decimal-points Thanks iphone cocoa touch share improve this question A more elegant solution happens to also be the simplest. You don't need a decimal separator key Why Because you can simply infer it from the user's input. For instance in the US locale when you what to enter in 1.23 you start by entering the numbers 1 2 3 in that order..
UIButton inside a view that has a UITapGestureRecognizer http://stackoverflow.com/questions/3344341/uibutton-inside-a-view-that-has-a-uitapgesturerecognizer through to these buttons The weird thing is that the buttons still get highlighted. I can't just remove the UITapGestureRecognizer after I received it's tap. Because with it the new view can also be removed. Means I want a behavior like the fullscreen vide controls . iphone objective c cocoa touch share improve this question..
http://stackoverflow.com/questions/412982/iphone-unzip-code have to parse the header and use other routines. To check have a look at the first two bytes of the file. If it is 'PK' it's WinZip if it's 0x1F8B it's gZip. Because this is iPhone specific have a look at this iPhone SDK forum discussion where miniZip is mentioned. It seems this can handle WinZip files. But if it's really a..
Difference between [NSMutableArray array] vs [[NSMutableArray alloc] init] http://stackoverflow.com/questions/5423211/difference-between-nsmutablearray-array-vs-nsmutablearray-alloc-init someone tell me the difference in declare an mutable array with NSMutableArray array NSMutableArray array and NSMutableArray array NSMutableArray alloc init Because in the beginning I was declaring all my arrays with alloc and if in the end of a certain function I returned the array created with alloc I had to autorelease that.. problems. Now using the first declaration I don't need to release anything. Thanks iphone objective c ios ipad memory leaks share improve this question Because in the beginning i was declaring all my arrays with alloc and if in the end of a certain function i returned the array created with alloc i had to autorelease that..
How to check for an active Internet Connection on iPhone SDK? http://stackoverflow.com/questions/1083701/how-to-check-for-an-active-internet-connection-on-iphone-sdk the Cocoa Touch libraries. I came up with a way to do this using an NSURL . The way I did it seems a bit unreliable because even Google could one day be down and relying on a 3rd party seems bad and while I could check to see for a response from..
How to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present scroll bar just for when the keyboard comes up. Even though it's not needed I feel like it provides a better interface because then the user can scroll and change textboxes for example. I've got it working where I change the frame size of the UIScrollView..
How to add a breakpoint to objc_exception_throw? http://stackoverflow.com/questions/1163981/how-to-add-a-breakpoint-to-objc-exception-throw to debug these exceptions. To do this go to Run Show Breakpoints and create two global breakpoints I do them globally because they are so useful in all my applications . The first should be named objc_exception_throw and its location should be libobjc.A.dylib..
Add UIPickerView & a Button in Action sheet - How? http://stackoverflow.com/questions/1262574/add-uipickerview-a-button-in-action-sheet-how There are many ways to accomplish this. Here's one way that I just implemented in a current project. It's nice because I can reuse it between 5 or 6 different screens where I all users to select from a list of options. Create a new UITableViewController..
How to store custom objects in NSUserDefaults http://stackoverflow.com/questions/2315948/how-to-store-custom-objects-in-nsuserdefaults the code given below Thank you but I'm still having some issues. Basically the code crashes now and I'm not sure why because it doesn't give any errors. Perhaps I'm missing something basic and I'm just too tired but we'll see. Here is the implementation..
How do I associate file types with an iPhone application? http://stackoverflow.com/questions/2774343/how-do-i-associate-file-types-with-an-iphone-application on UTIs can be found in Apple's Uniform Type Identifiers Overview . Those guides reside in the Mac developer center because this capability has been ported across from the Mac. One of the UTIs used in the above example was system defined but the..
How can I send mail from an iPhone application http://stackoverflow.com/questions/310946/how-can-i-send-mail-from-an-iphone-application my iPhone application. I have heard that the iOS SDK doesn't have an email API. I don't want to use the following code because it will exit my application NSString url NSString stringWithString @ mailto foo@example.com cc bar@example.com subject Greetings..
How do I apply a perspective transform to a UIView? http://stackoverflow.com/questions/347721/how-do-i-apply-a-perspective-transform-to-a-uiview
How do you use NSAttributedString? http://stackoverflow.com/questions/3482346/how-do-you-use-nsattributedstring SDK 4.0 beta . I would like to have a string that has three colours. The reason I don't use 3 separate NSStrings is because the length of each of the three NSAttributedString substrings will be changing often and so I would prefer not to use any..
Prefixing property names with an underscore in Objective C [duplicate] http://stackoverflow.com/questions/3521254/prefixing-property-names-with-an-underscore-in-objective-c in front of a variable in a cocoa objective c class work I've always avoided underscores in my variable names perhaps because its just not what was done back in my learning Java in college days. So when I define a property in Objective C this is.. In the implementation @synthesize myStringProperty _myStringProperty Should I get over my aversion to the underscore because that is the one way it should be done is there a good reason for this style being the preferred one iphone objective c..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints pdfPage issue is the object containg the CGPDFDocumentRef . I synchronize the part where I access the pdfDoc property because I release it and recreate it when receiving memoryWarnings. It seems that the CGPDFDocumentRef object do some internal caching..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll data for the primary TableView. I want to make sure I'm on the right path before I change too much code. I'm confused because so many of the examples are array based instead of CoreData. Here are some questions Do I need to have a second NSFetchedResultsController..
Change User Agent in UIWebView (iPhone SDK) http://stackoverflow.com/questions/478387/change-user-agent-in-uiwebview-iphone-sdk dictionary See previous edits on this post if you need methods that work in versions of iOS before 4.3 5.0. Note that because of the extensive edits the following comments other answers on this page may not make sense. This is a four year old question..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c you still need to check with respondsToSelector before calling a particular method on it. Apple recommends this method because it is more precise doesn't mess with NSObject and can provide better tool support. Speed Optimizations Instead of checking..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c differs from malloc and free is that any given object doesn't need to worry about other parts of the system crashing because you've freed memory they were using. Assuming everyone is playing along and retaining releasing according to the rules when..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown may cause a leak because its selector is unknown I'm getting the following warning by the ARC compiler performSelector may cause a leak because.. its selector is unknown I'm getting the following warning by the ARC compiler performSelector may cause a leak because its selector is unknown . Here's what I'm doing _controller performSelector NSSelectorFromString @ someMethod Why do I get.. complain about selectors declared statically _controller performSelector @selector someMethod The reason for this is because the compiler actually is able to record all of the information about the selector and the object during compilation. It..
iPhone Data Usage Tracking/Monitoring http://stackoverflow.com/questions/7946699/iphone-data-usage-tracking-monitoring its main interface . yes. Then device is connected via WiFi and doesn't use internet if_iobytes values still come because this method provides network bytes exchanges and not just internet . NSArray getDataCounters BOOL success struct ifaddrs..
How to convert time to the timezone of the iPhone device? http://stackoverflow.com/questions/1081647/how-to-convert-time-to-the-timezone-of-the-iphone-device timezone of the iPhone device I have a time in EST timezone it is done using the NOW function on the mysql server. Because my server is located in EST the time stored is in EST. When I retrieve it from my app on the iPhone I need to display it..
What happens if I don't retain IBOutlet? http://stackoverflow.com/questions/1250518/what-happens-if-i-dont-retain-iboutlet At this point the view property of the top level UIView will be nulled out it will be released and deallocated. Because the UITextField was set as a property that was retained the UITextField is not deallocated as it would have been had its..
Declaration/definition of variables locations in ObjectiveC? http://stackoverflow.com/questions/12632285/declaration-definition-of-variables-locations-in-objectivec call methods OtherClass.m int v myClass myVar assuming myClass is an object of type MyClass. myClass setMyVar v 1 Because manually declaring and implementing every accessor method was quite annoying @property and @synthesize were introduced to..
Send mail without MFMailComposeViewController http://stackoverflow.com/questions/1263412/send-mail-without-mfmailcomposeviewcontroller question This is not supported by the iPhone SDK probably because Apple doesn't want you to do it. Why not My guess Because it's easy to abuse. If we knew user's email address we could spam them we could fake emails from them etc. Imagine finding..
How to make xib compatible with both iphone 5 and iphone 4 devices http://stackoverflow.com/questions/13275144/how-to-make-xib-compatible-with-both-iphone-5-and-iphone-4-devices iphone 4 devices I am trying to layout my xib so that layout fits in both iphone 5 4 inches retina and 3.5 devices. Because I have to support IOS 5 I cannot use autolayout. I have to use springs and Struts. I tried everything in interface builder...
Break on EXC_BAD_ACCESS in XCode? http://stackoverflow.com/questions/1622079/break-on-exc-bad-access-in-xcode TO NOTE however is that you need to 100 make sure this is only in your debug code and not your distribution code. Because nothing is ever released your app will leak and leak and leak. To remind me to do this I put this log in my appdelegate..
Changing my CALayer's anchorPoint moves the view http://stackoverflow.com/questions/1968017/changing-my-calayers-anchorpoint-moves-the-view of the layer you are then setting the location of the center of the layer in its superlayer's coordinate system. Because the position is relative to the anchorPoint of the layer changing that anchorPoint while maintaining the same position moves..
Notification of or detecting screenshot being taken? http://stackoverflow.com/questions/2121970/notification-of-or-detecting-screenshot-being-taken the user to have their finger on the screen for the image to show then I don't think they can create screenshots. Because as soon as you press the home lock keys to actually take the screenshot the screen seems to behave as if there are no fingers..
Using SSL in an iPhone App - Export Compliance http://stackoverflow.com/questions/2128927/using-ssl-in-an-iphone-app-export-compliance an iPhone App Export Compliance I'm looking at creating an iPhone app that will communicate with a REST Web service. Because some user sensitive data name address age etc will be transmitted I'm looking at securing the connections with SSL. However..
How to set the width of a cell in a UITableView in grouped style http://stackoverflow.com/questions/2539021/how-to-set-the-width-of-a-cell-in-a-uitableview-in-grouped-style this void setFrame CGRect frame frame.origin.x inset frame.size.width 2 inset super setFrame frame Why is it better Because the other two are worse. Adjust table view width in viewWillAppear First of all this is unreliable the superview or parent..
What is the best way to enter numeric values with decimal points? http://stackoverflow.com/questions/276382/what-is-the-best-way-to-enter-numeric-values-with-decimal-points this question A more elegant solution happens to also be the simplest. You don't need a decimal separator key Why Because you can simply infer it from the user's input. For instance in the US locale when you what to enter in 1.23 you start by..
UIButton inside a view that has a UITapGestureRecognizer http://stackoverflow.com/questions/3344341/uibutton-inside-a-view-that-has-a-uitapgesturerecognizer is that the buttons still get highlighted. I can't just remove the UITapGestureRecognizer after I received it's tap. Because with it the new view can also be removed. Means I want a behavior like the fullscreen vide controls . iphone objective..
Behaviour for significant change location API when terminated/suspended? http://stackoverflow.com/questions/3421242/behaviour-for-significant-change-location-api-when-terminated-suspended up time your application is put into the background and given a small amount of time to process the location data. Because your application is in the background it should do minimal work and avoid any tasks such as querying the network that might..
http://stackoverflow.com/questions/412982/iphone-unzip-code routines. To check have a look at the first two bytes of the file. If it is 'PK' it's WinZip if it's 0x1F8B it's gZip. Because this is iPhone specific have a look at this iPhone SDK forum discussion where miniZip is mentioned. It seems this can handle..
Can somebody explain the process of a UIViewController birth (which method follows which)? http://stackoverflow.com/questions/5107604/can-somebody-explain-the-process-of-a-uiviewcontroller-birth-which-method-follo to do custom subview layout instead of relying on Cocoa's default autoresizing methods. 5. Putting it all together Because of the complexity there are many different ways for this process to occur but a normal timeline could look something like..
Difference between [NSMutableArray array] vs [[NSMutableArray alloc] init] http://stackoverflow.com/questions/5423211/difference-between-nsmutablearray-array-vs-nsmutablearray-alloc-init an mutable array with NSMutableArray array NSMutableArray array and NSMutableArray array NSMutableArray alloc init Because in the beginning I was declaring all my arrays with alloc and if in the end of a certain function I returned the array created.. I don't need to release anything. Thanks iphone objective c ios ipad memory leaks share improve this question Because in the beginning i was declaring all my arrays with alloc and if in the end of a certain function i returned the array created..
http://stackoverflow.com/questions/6214725/iphone-call-log-history iPhone . I searched the API including Core Telephony and didn't find anything myself either. So why this question Because this app in the App Store seems to be doing this without a problem... http itunes.apple.com us app callog id327883585 mt..
Are the Core Image filters in iOS 5.0 fast enough for realtime video processing? http://stackoverflow.com/questions/6625888/are-the-core-image-filters-in-ios-5-0-fast-enough-for-realtime-video-processing of your filters the image size being filtered and the performance characteristics of the device you're running on. Because Core Image has been available for a while on the Mac I can point you to the Core Image Programming Guide as a resource for..
Last In-First Out Stack with GCD? http://stackoverflow.com/questions/7567827/last-in-first-out-stack-with-gcd I ended up implementing... iphone objective c ios uitableview grand central dispatch share improve this question Because of the memory constraints of the device you should load the images on demand and on a background GCD queue. In the cellForRowAtIndexPath..
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