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2014/10/15 ¤U¤È 10:04:52
iphone Programming Glossary: callingHow would I tint an image programatically on the iPhone? http://stackoverflow.com/questions/1117211/how-would-i-tint-an-image-programatically-on-the-iphone image but it is not being tinted. I also tried loading other images setting the image in IB and calling setNeedsDisplay in my view controller. Update drawRect is not being called. Final update I found an..
Add UIPickerView & a Button in Action sheet - How? http://stackoverflow.com/questions/1262574/add-uipickerview-a-button-in-action-sheet-how In SimpleTableViewController.m implement the tableview data source and delegate methods calling itemSelectedatRow in tableView didSelectRowAtIndexPath . This approach has the added benefit of being..
How To Make iPhone App compatible with multiple SDK (firmware) versions http://stackoverflow.com/questions/3027120/how-to-make-iphone-app-compatible-with-multiple-sdk-firmware-versions that doesn't have the newer symbols. You must check to see that a newer method is available before calling it. You have to make sure not to call a method that is 5.0 or 4.X only when your app is on a 4.0 device...
display image from URL retrieved from ALAsset in iPhone http://stackoverflow.com/questions/3837115/display-image-from-url-retrieved-from-alasset-in-iphone with iOS5 maybe single core devices so I couldnt rely on the image to be available directly after calling findLargeImage . So I changed it to call out to a delegate. @protocol HiresImageDelegate NSObject @optional..
Difference between self.ivar and ivar? http://stackoverflow.com/questions/4142177/difference-between-self-ivar-and-ivar the current string then retains the new string and finally sets name to the retained string. Just calling name foo does nothing more than assigning name to foo. This also means that you can only call self.xxx..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c ... other methods here @end You would then use respondsToSelector as described above when calling this method. Delegates simply implement this method and they're done. This method is straight forward.. 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..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c of how many times it is being referenced specifically the NSObject base class implements this . By calling retain on an object you are telling it that you want to up its reference count by one. By calling release.. calling retain on an object you are telling it that you want to up its reference count by one. By calling release you tell the object you are letting go of it and its reference count is decremented. If after.. you tell the object you are letting go of it and its reference count is decremented. If after calling release the reference count is now zero then that object's memory is freed by the system. The basic..
Detecting the iPhone's Ring / Silent / Mute switch using AVAudioPlayer not working? http://stackoverflow.com/questions/6901363/detecting-the-iphones-ring-silent-mute-switch-using-avaudioplayer-not-worki 7 . Has anyone used this method successfully If so on what kind of device and SDK version I'm calling it like so BOOL deviceIsSilenced CFStringRef state UInt32 propertySize sizeof CFStringRef OSStatus audioStatus..
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 warning is that with ARC the runtime needs to know what to do with the result of the method you're calling. The result could be anything void int char NSString id etc. ARC normally gets this information from.. The call to methodForSelector assumes that the return value of the method it's calling is an object but does not retain release it. So you could end up creating a leak if your object is supposed.. creating a leak if your object is supposed to be released as in #3 above that is the method you're calling returns a new object . For selectors you're trying to call that return void or other non objects you..
iPhone: How to load a View using a nib file created with Interface Builder http://stackoverflow.com/questions/863321/iphone-how-to-load-a-view-using-a-nib-file-created-with-interface-builder NSBundle mainBundle loadNibNamed @ myViewNib owner self options nil Now as soon as you do that calling your property self.myViewFromNib will give you access to the view from your nib share improve this..
View Controllers: How to switch between views programmatically? http://stackoverflow.com/questions/910994/view-controllers-how-to-switch-between-views-programmatically I allocate that ViewController's class and the view get's visible would I have to take care about calling those methods How does it know that viewWillAppear viewDidDisappear or viewDidLoad I believe that the..
How would I tint an image programatically on the iPhone? http://stackoverflow.com/questions/1117211/how-would-i-tint-an-image-programatically-on-the-iphone setOverlayColor UIColor blueColor super viewDidLoad I see the image but it is not being tinted. I also tried loading other images setting the image in IB and calling setNeedsDisplay in my view controller. Update drawRect is not being called. Final update I found an old project that had an imageView set up properly so I could..
Add UIPickerView & a Button in Action sheet - How? http://stackoverflow.com/questions/1262574/add-uipickerview-a-button-in-action-sheet-how This is how we will pass the selection back to the parent controller. In SimpleTableViewController.m implement the tableview data source and delegate methods calling itemSelectedatRow in tableView didSelectRowAtIndexPath . This approach has the added benefit of being fairly reusable. To use import the SimpleTableViewController..
How To Make iPhone App compatible with multiple SDK (firmware) versions http://stackoverflow.com/questions/3027120/how-to-make-iphone-app-compatible-with-multiple-sdk-firmware-versions in the newer iOS. This is so your app will run on a device that doesn't have the newer symbols. You must check to see that a newer method is available before calling it. You have to make sure not to call a method that is 5.0 or 4.X only when your app is on a 4.0 device. Of course you have to gracefully handle working on older..
display image from URL retrieved from ALAsset in iPhone http://stackoverflow.com/questions/3837115/display-image-from-url-retrieved-from-alasset-in-iphone update When the result block fires seems to be a bit slower with iOS5 maybe single core devices so I couldnt rely on the image to be available directly after calling findLargeImage . So I changed it to call out to a delegate. @protocol HiresImageDelegate NSObject @optional void hiresImageAvailable UIImage aimage @end and comme..
Difference between self.ivar and ivar? http://stackoverflow.com/questions/4142177/difference-between-self-ivar-and-ivar mutator generated by the compiler which will first release the current string then retains the new string and finally sets name to the retained string. Just calling name foo does nothing more than assigning name to foo. This also means that you can only call self.xxx when you have defined a property for the ivar otherwise the..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c NSWindowNotifications void windowDidMove NSNotification notification ... other methods here @end You would then use respondsToSelector as described above when calling this method. Delegates simply implement this method and they're done. This method is straight forward and common in Apple's libraries but new code should use the.. methods in the protocol. For methods declared in the protocol 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..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c the basic concepts. In Cocoa each object keeps track of how many times it is being referenced specifically the NSObject base class implements this . By calling retain on an object you are telling it that you want to up its reference count by one. By calling release you tell the object you are letting go of it and its reference.. specifically the NSObject base class implements this . By calling retain on an object you are telling it that you want to up its reference count by one. By calling release you tell the object you are letting go of it and its reference count is decremented. If after calling release the reference count is now zero then that.. you want to up its reference count by one. By calling release you tell the object you are letting go of it and its reference count is decremented. If after calling release the reference count is now zero then that object's memory is freed by the system. The basic way this differs from malloc and free is that any given object..
Detecting the iPhone's Ring / Silent / Mute switch using AVAudioPlayer not working? http://stackoverflow.com/questions/6901363/detecting-the-iphones-ring-silent-mute-switch-using-avaudioplayer-not-worki the length value returned by CFStringGetLength state is always 7 . Has anyone used this method successfully If so on what kind of device and SDK version I'm calling it like so BOOL deviceIsSilenced CFStringRef state UInt32 propertySize sizeof CFStringRef OSStatus audioStatus AudioSessionGetProperty kAudioSessionProperty_AudioRoute..
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 someRect someView Reasoning for Warning The reason for this warning is that with ARC the runtime needs to know what to do with the result of the method you're calling. The result could be anything void int char NSString id etc. ARC normally gets this information from the header of the object type you're working with. 2 There.. inner most release pool is drained attributed with ns_returns_autoreleased The call to methodForSelector assumes that the return value of the method it's calling is an object but does not retain release it. So you could end up creating a leak if your object is supposed to be released as in #3 above that is the method you're.. object but does not retain release it. So you could end up creating a leak if your object is supposed to be released as in #3 above that is the method you're calling returns a new object . For selectors you're trying to call that return void or other non objects you could enable compiler features to ignore the warning but it..
iPhone: How to load a View using a nib file created with Interface Builder http://stackoverflow.com/questions/863321/iphone-how-to-load-a-view-using-a-nib-file-created-with-interface-builder
View Controllers: How to switch between views programmatically? http://stackoverflow.com/questions/910994/view-controllers-how-to-switch-between-views-programmatically if I do it my way without a tab bar controller I mean If I allocate that ViewController's class and the view get's visible would I have to take care about calling those methods How does it know that viewWillAppear viewDidDisappear or viewDidLoad I believe that the Tab Bar Controller has all this cleverness under the hood...
How would I tint an image programatically on the iPhone? http://stackoverflow.com/questions/1117211/how-would-i-tint-an-image-programatically-on-the-iphone viewDidLoad I see the image but it is not being tinted. I also tried loading other images setting the image in IB and calling setNeedsDisplay in my view controller. Update drawRect is not being called. Final update I found an old project that had..
Add UIPickerView & a Button in Action sheet - How? http://stackoverflow.com/questions/1262574/add-uipickerview-a-button-in-action-sheet-how back to the parent controller. In SimpleTableViewController.m implement the tableview data source and delegate methods calling itemSelectedatRow in tableView didSelectRowAtIndexPath . This approach has the added benefit of being fairly reusable. To..
How To Make iPhone App compatible with multiple SDK (firmware) versions http://stackoverflow.com/questions/3027120/how-to-make-iphone-app-compatible-with-multiple-sdk-firmware-versions run on a device that doesn't have the newer symbols. You must check to see that a newer method is available before calling it. You have to make sure not to call a method that is 5.0 or 4.X only when your app is on a 4.0 device. Of course you have..
display image from URL retrieved from ALAsset in iPhone http://stackoverflow.com/questions/3837115/display-image-from-url-retrieved-from-alasset-in-iphone to be a bit slower with iOS5 maybe single core devices so I couldnt rely on the image to be available directly after calling findLargeImage . So I changed it to call out to a delegate. @protocol HiresImageDelegate NSObject @optional void hiresImageAvailable..
Difference between self.ivar and ivar? http://stackoverflow.com/questions/4142177/difference-between-self-ivar-and-ivar will first release the current string then retains the new string and finally sets name to the retained string. Just calling name foo does nothing more than assigning name to foo. This also means that you can only call self.xxx when you have defined..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c NSNotification notification ... other methods here @end You would then use respondsToSelector as described above when calling this method. Delegates simply implement this method and they're done. This method is straight forward and common in Apple's.. in the protocol 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..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c object keeps track of how many times it is being referenced specifically the NSObject base class implements this . By calling retain on an object you are telling it that you want to up its reference count by one. By calling release you tell the object.. implements this . By calling retain on an object you are telling it that you want to up its reference count by one. By calling release you tell the object you are letting go of it and its reference count is decremented. If after calling release the.. one. By calling release you tell the object you are letting go of it and its reference count is decremented. If after calling release the reference count is now zero then that object's memory is freed by the system. The basic way this differs from..
Detecting the iPhone's Ring / Silent / Mute switch using AVAudioPlayer not working? http://stackoverflow.com/questions/6901363/detecting-the-iphones-ring-silent-mute-switch-using-avaudioplayer-not-worki state is always 7 . Has anyone used this method successfully If so on what kind of device and SDK version I'm calling it like so BOOL deviceIsSilenced CFStringRef state UInt32 propertySize sizeof CFStringRef OSStatus audioStatus AudioSessionGetProperty..
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 The reason for this warning is that with ARC the runtime needs to know what to do with the result of the method you're calling. The result could be anything void int char NSString id etc. ARC normally gets this information from the header of the object.. attributed with ns_returns_autoreleased The call to methodForSelector assumes that the return value of the method it's calling is an object but does not retain release it. So you could end up creating a leak if your object is supposed to be released.. So you could end up creating a leak if your object is supposed to be released as in #3 above that is the method you're calling returns a new object . For selectors you're trying to call that return void or other non objects you could enable compiler..
iPhone: How to load a View using a nib file created with Interface Builder http://stackoverflow.com/questions/863321/iphone-how-to-load-a-view-using-a-nib-file-created-with-interface-builder
View Controllers: How to switch between views programmatically? http://stackoverflow.com/questions/910994/view-controllers-how-to-switch-between-views-programmatically controller I mean If I allocate that ViewController's class and the view get's visible would I have to take care about calling those methods How does it know that viewWillAppear viewDidDisappear or viewDidLoad I believe that the Tab Bar Controller..
Calling web service on Scrolling UITableView http://stackoverflow.com/questions/14053143/calling-web-service-on-scrolling-uitableview web service on Scrolling UITableView Totally Confused ... I have one web service that accepts the pageNumber as Parameter..
Select tableview row programmatically http://stackoverflow.com/questions/2035061/select-tableview-row-programmatically only highlight the row. iphone objective c cocoa touch share improve this question From reference documentation Calling this method does not cause the delegate to receive a tableView willSelectRowAtIndexPath or tableView didSelectRowAtIndexPath..
Reading Open-XML documents in IOS http://stackoverflow.com/questions/2131430/reading-open-xml-documents-in-ios NSURL url NSURL fileURLWithPath path NSURLRequest request NSURLRequest requestWithURL url webView loadRequest request Calling loadDocument inView self loadDocument @ mydocument.rtfd.zip inView self.myWebview Taken from here . Besides also check out..
http://stackoverflow.com/questions/2238640/how-do-i-stop-nsxmlparser xmlParser abortParsing xmlParser release xmlParser nil iphone sdk nsxmlparser share improve this question Calling parser abortParsing will certainly stop the parser but why would you expect it to stop the rest of your code all you have..
Displaying ppt, doc, and xls in UIWebView doesn't work but pdf does http://stackoverflow.com/questions/2520137/displaying-ppt-doc-and-xls-in-uiwebview-doesnt-work-but-pdf-does NSURL url NSURL fileURLWithPath path NSURLRequest request NSURLRequest requestWithURL url webView loadRequest request Calling loadDocument inView self loadDocument @ mydocument.rtfd.zip inView self.myWebview It works for these in iPhone OS 2.2.1..
Calling a method when UIWebView scrolls http://stackoverflow.com/questions/4048677/calling-a-method-when-uiwebview-scrolls a method when UIWebView scrolls I have a UIWebView that contains a lot of text content. I need to be able to get the location..
Calling C++ method from Objective C http://stackoverflow.com/questions/4456239/calling-c-method-from-objective-c C method from Objective C I have the following files. foo.h C header file foo.mm C file test_viewcontroller.h objective..
iPhone UINavigation Issue - nested push animation can result in corrupted navigation bar http://stackoverflow.com/questions/5525519/iphone-uinavigation-issue-nested-push-animation-can-result-in-corrupted-naviga
Convert decimal to fraction in Objective-C? http://stackoverflow.com/questions/5552537/convert-decimal-to-fraction-in-objective-c m 0 1 m 1 0 m 1 0 ai m 1 1 return Fraction .nominator m 0 0 .denominator m 1 0 .error startx double m 0 0 double m 1 0 Calling it like this double aReal 123.45 long maxDenominator 42 Fraction aFraction fractionFromReal aReal maxDenominator printf..
Calling method in current view controller from App Delegate in iOS http://stackoverflow.com/questions/5873450/calling-method-in-current-view-controller-from-app-delegate-in-ios method in current view controller from App Delegate in iOS I have two view controllers BuildingsViewController and RoomsViewController..
Why does this create a memory leak (iPhone)? http://stackoverflow.com/questions/612986/why-does-this-create-a-memory-leak-iphone dealloc method. You should call editMyObject release assuming the ivar backing the @property is called editMyObject . Calling the accessor via self.editMyObject is safe for @synthesized accessors but if an overriden accessor relies on object state..
How can I write an iPhone app entirely in JavaScript without making it just a web app? http://stackoverflow.com/questions/64420/how-can-i-write-an-iphone-app-entirely-in-javascript-without-making-it-just-a-we dev cycle for me. Some day I'm sure I'll have to break down and learn Obj C. A few other resources I found helpful Calling Obj C from javascript calling objective c from javascript Calling javascript from Obj C iphone app development for web hackers.. learn Obj C. A few other resources I found helpful Calling Obj C from javascript calling objective c from javascript Calling javascript from Obj C iphone app development for web hackers Reading files from application bundle uiwebview share improve..
How to release MPMoviePlayerController? http://stackoverflow.com/questions/695307/how-to-release-mpmovieplayercontroller stop message before you can safely release it. So I do it in handlePlaybackEnd first I stop it then I autorelease it. Calling release doesn't seem to work too well void moviePlayBackDidFinish NSNotification notification VideoPlayerController player..
Tracking audio (level of intensity) - android/iphone http://stackoverflow.com/questions/8324463/tracking-audio-level-of-intensity-android-iphone
Calling method on category included from iPhone static library causes NSInvalidArgumentException http://stackoverflow.com/questions/932856/calling-method-on-category-included-from-iphone-static-library-causes-nsinvalida method on category included from iPhone static library causes NSInvalidArgumentException I have created a static library.. Extensions. In this category I have a method called void fadeOutWithDelay CGFloat delay duration CGFloat duration Calling this method works fine on the simulator on Debug configuration. However if try to run the app on the device I get a NSInvalidArgumentException..
Calling a method from another class in Objective C http://stackoverflow.com/questions/9629417/calling-a-method-from-another-class-in-objective-c a method from another class in Objective C I have 2 classes say class A and class B. Class B is created in class A. I have.. B. Class B is created in class A. I have a method in class A which needs to be executed in both class A and class B. Calling the method in class A itself is fine. But I am not sure about calling the method in class B. I have tried declaring the..
How to trigger MKAnnotationView's callout view without touching the pin? http://stackoverflow.com/questions/978897/how-to-trigger-mkannotationviews-callout-view-without-touching-the-pin location points. I would like to be able to have the callout displayed without touching the pin. How should I do that Calling setSelected YES on the annotationview did nothing. I'm thinking of simulate a touch on the pin but I'm not sure how to go..
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