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2014/10/15 ¤U¤È 10:10:08
iphone Programming Glossary: i.eRetrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage for the alpha channel. Do I need to translate the co ordinates between UIKit and Core Graphics i.e is the y axis inverted Or have I misunderstood premultiplied alpha values Update @Nikolai Ruhe's suggestion..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs 's frame. My solution when I had to do this very recently was as follows Create a UIView subclass i.e. ClipView that will contain the UIScrollView and it's subviews. Essentially it should have the frame..
How can I launch the Google Maps iPhone application from within my own native application? http://stackoverflow.com/questions/30058/how-can-i-launch-the-google-maps-iphone-application-from-within-my-own-native-ap same Google Maps application with a specific address from within my own native iPhone application i.e. not a web page through Mobile Safari in the same way that tapping an address in Contacts launches the..
Install xCode 3.2.3 w/ iPhone SDK 4, get “Base SDK missing”, can't see other SDKs http://stackoverflow.com/questions/3161385/install-xcode-3-2-3-w-iphone-sdk-4-get-base-sdk-missing-cant-see-other-sdk version or SDK cf. here . Yes you can install multiple Xcode versions in different directories i.e. put only one version in Developer. You can use the old Xcode to test your app's compliance vs. a 3.x..
Managing multiple asynchronous NSURLConnection connections http://stackoverflow.com/questions/332276/managing-multiple-asynchronous-nsurlconnection-connections I track responses in an CFMutableDictionaryRef keyed by the NSURLConnection associated with it. i.e. connectionToInfoMapping CFDictionaryCreateMutable kCFAllocatorDefault 0 kCFTypeDictionaryKeyCallBacks..
Build fat static library (device + simulator) using Xcode and SDK 4+ http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 each other from Xcode 3.x through to Xcode 4.6.x Bonus script to let you auto include Bundles i.e. include PNG files PLIST files etc from your library see below scroll to bottom now supports iPhone5..
Difference between self.ivar and ivar? http://stackoverflow.com/questions/4142177/difference-between-self-ivar-and-ivar hello and self.name @ hello Thanks EDIT Follow up question How to write my own setter for an ivar i.e. self.ivar ... iphone objective c ios share improve this question self.name uses the accessor and..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events you can make your app be looking like running forever . Register for one background process i.e. VoIP . This will cause your app to be restarted after termination. Now write some Task has to be finished.. dispatch_block_t expirationHandler into your headerfile and initialize the code somewhere else i.e. void applicationDidFinishLaunching UIApplication application expirationHandler ^ ... because your app..
http://stackoverflow.com/questions/554997/cancel-a-uiview-animation to cancel a UIView animation while it is in progress Or would I have to drop to the CA level i.e. I've done something like this maybe setting an end animation action too UIView beginAnimations nil..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers a global variable . Instead you should always inject those dependencies into the controller i.e. pass in the objects it needs via methods . If you follow the dependency injection pattern your controller.. will be modular and reusable. And if you think about where the Stanford presenters are coming from i.e. as Apple employees their job is to build classes that can easily be reused reusability and modularity.. use it in my own application assuming BookWarehouse and CheckoutController are generic interfaces i.e. protocols that I can implement @interface MyBookWarehouse NSObject BookWarehouse ... @end @implementation..
Undefined symbols for architecture i386: _OBJC_CLASS_$_SKPSMTPMessage", referenced from: error http://stackoverflow.com/questions/6984368/undefined-symbols-for-architecture-i386-objc-class-skpsmtpmessage-refere imported framework for sending email from application in background. i have imported framework i.e. SKPSMTPMessage. Can somebody suggest me why i am getting this error Undefined symbols for architecture..
iCloud basics and code sample [closed] http://stackoverflow.com/questions/7795629/icloud-basics-and-code-sample So there shouldn't be any need for me save anything into the 'old' sandbox of my app i.e. as it used to be in the old pre iCloud days . Right now my sandbox is totally empty but I don't know.. NSNotification notification 3 if Query is finished this will send the result i.e. either it found our text.dat or it didn't to the next function NSMetadataQuery query notification object..
Programmatically lock and unlock iPhone screen http://stackoverflow.com/questions/832940/programmatically-lock-and-unlock-iphone-screen lock and unlock iPhone screen How do I programmatically lock and unlock the main screen i.e. the device itself of an iPhone iphone share improve this question It can be done by caling GSEventLockDevice..
how to create iphone's wobbling icon effect? http://stackoverflow.com/questions/929364/how-to-create-iphones-wobbling-icon-effect
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage black transparent area of the image I get non zero values for the alpha channel. Do I need to translate the co ordinates between UIKit and Core Graphics i.e is the y axis inverted Or have I misunderstood premultiplied alpha values Update @Nikolai Ruhe's suggestion was key to this. I did not in fact need to translate..
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs user starts the drag outside the range of the UIScrollView 's frame. My solution when I had to do this very recently was as follows Create a UIView subclass i.e. ClipView that will contain the UIScrollView and it's subviews. Essentially it should have the frame of what you would assume the UIScrollView would have under..
How can I launch the Google Maps iPhone application from within my own native application? http://stackoverflow.com/questions/30058/how-can-i-launch-the-google-maps-iphone-application-from-within-my-own-native-ap standard with the iPhone will launch. How can I launch the same Google Maps application with a specific address from within my own native iPhone application i.e. not a web page through Mobile Safari in the same way that tapping an address in Contacts launches the map NOTE THIS ONLY WORKS ON THE DEVICE ITSELF. NOT IN THE..
Install xCode 3.2.3 w/ iPhone SDK 4, get “Base SDK missing”, can't see other SDKs http://stackoverflow.com/questions/3161385/install-xcode-3-2-3-w-iphone-sdk-4-get-base-sdk-missing-cant-see-other-sdk You can still download from Apple and install a previous Xcode version or SDK cf. here . Yes you can install multiple Xcode versions in different directories i.e. put only one version in Developer. You can use the old Xcode to test your app's compliance vs. a 3.x SDK moving the hard work to a fancy compiler and simulator...
Managing multiple asynchronous NSURLConnection connections http://stackoverflow.com/questions/332276/managing-multiple-asynchronous-nsurlconnection-connections objective c cocoa cocoa touch share improve this question I track responses in an CFMutableDictionaryRef keyed by the NSURLConnection associated with it. i.e. connectionToInfoMapping CFDictionaryCreateMutable kCFAllocatorDefault 0 kCFTypeDictionaryKeyCallBacks kCFTypeDictionaryValueCallBacks It may seem odd to use this..
Build fat static library (device + simulator) using Xcode and SDK 4+ http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 of show stopper bugs in Xcode if you embed projects inside each other from Xcode 3.x through to Xcode 4.6.x Bonus script to let you auto include Bundles i.e. include PNG files PLIST files etc from your library see below scroll to bottom now supports iPhone5 using Apple's workaround to the bugs in lipo . NOTE the install..
Difference between self.ivar and ivar? http://stackoverflow.com/questions/4142177/difference-between-self-ivar-and-ivar Could someone please explain the difference between name @ hello and self.name @ hello Thanks EDIT Follow up question How to write my own setter for an ivar i.e. self.ivar ... iphone objective c ios share improve this question self.name uses the accessor and or mutator defined by you this is nonatomic and retain in..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events background automatically after bootup With abusing this behavior you can make your app be looking like running forever . Register for one background process i.e. VoIP . This will cause your app to be restarted after termination. Now write some Task has to be finished code. According to Apple you have some time 5 seconds.. app UIApplication sharedApplication it's better to move dispatch_block_t expirationHandler into your headerfile and initialize the code somewhere else i.e. void applicationDidFinishLaunching UIApplication application expirationHandler ^ ... because your app may crash if you initialize expirationHandler twice. dispatch_block_t..
http://stackoverflow.com/questions/554997/cancel-a-uiview-animation a UIView animation Is it possible to cancel a UIView animation while it is in progress Or would I have to drop to the CA level i.e. I've done something like this maybe setting an end animation action too UIView beginAnimations nil context NULL UIView setAnimationDuration duration UIView setAnimationCurve..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers look up the objects it needs to do its job e.g. reference a global variable . Instead you should always inject those dependencies into the controller i.e. pass in the objects it needs via methods . If you follow the dependency injection pattern your controller will be modular and reusable. And if you think about.. you follow the dependency injection pattern your controller will be modular and reusable. And if you think about where the Stanford presenters are coming from i.e. as Apple employees their job is to build classes that can easily be reused reusability and modularity are high priorities. All of the best practices they mention.. class and related GUI view objects and I can easily use it in my own application assuming BookWarehouse and CheckoutController are generic interfaces i.e. protocols that I can implement @interface MyBookWarehouse NSObject BookWarehouse ... @end @implementation MyBookWarehouse ... @end @interface MyCheckoutController..
Undefined symbols for architecture i386: _OBJC_CLASS_$_SKPSMTPMessage", referenced from: error http://stackoverflow.com/questions/6984368/undefined-symbols-for-architecture-i386-objc-class-skpsmtpmessage-refere i386 _OBJC_CLASS_ _SKPSMTPMessage referenced from error I have imported framework for sending email from application in background. i have imported framework i.e. SKPSMTPMessage. Can somebody suggest me why i am getting this error Undefined symbols for architecture i386 _OBJC_CLASS_ _SKPSMTPMessage referenced from objc class..
iCloud basics and code sample [closed] http://stackoverflow.com/questions/7795629/icloud-basics-and-code-sample I understand iCloud it will save a local copy of text.txt automatically. So there shouldn't be any need for me save anything into the 'old' sandbox of my app i.e. as it used to be in the old pre iCloud days . Right now my sandbox is totally empty but I don't know if this is correct. Should I keep another copy of text.txt.. @ AppDelegate new document opened from iCloud void queryDidFinishGathering NSNotification notification 3 if Query is finished this will send the result i.e. either it found our text.dat or it didn't to the next function NSMetadataQuery query notification object query disableUpdates query stopQuery self loadData query..
Programmatically lock and unlock iPhone screen http://stackoverflow.com/questions/832940/programmatically-lock-and-unlock-iphone-screen lock and unlock iPhone screen How do I programmatically lock and unlock the main screen i.e. the device itself of an iPhone iphone share improve this question It can be done by caling GSEventLockDevice from your app. This function can be found in..
how to create iphone's wobbling icon effect? http://stackoverflow.com/questions/929364/how-to-create-iphones-wobbling-icon-effect
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage I get non zero values for the alpha channel. Do I need to translate the co ordinates between UIKit and Core Graphics i.e is the y axis inverted Or have I misunderstood premultiplied alpha values Update @Nikolai Ruhe's suggestion was key to this...
UIScrollView horizontal paging like Mobile Safari tabs http://stackoverflow.com/questions/1220354/uiscrollview-horizontal-paging-like-mobile-safari-tabs of the UIScrollView 's frame. My solution when I had to do this very recently was as follows Create a UIView subclass i.e. ClipView that will contain the UIScrollView and it's subviews. Essentially it should have the frame of what you would assume..
How can I launch the Google Maps iPhone application from within my own native application? http://stackoverflow.com/questions/30058/how-can-i-launch-the-google-maps-iphone-application-from-within-my-own-native-ap How can I launch the same Google Maps application with a specific address from within my own native iPhone application i.e. not a web page through Mobile Safari in the same way that tapping an address in Contacts launches the map NOTE THIS ONLY..
Install xCode 3.2.3 w/ iPhone SDK 4, get “Base SDK missing”, can't see other SDKs http://stackoverflow.com/questions/3161385/install-xcode-3-2-3-w-iphone-sdk-4-get-base-sdk-missing-cant-see-other-sdk a previous Xcode version or SDK cf. here . Yes you can install multiple Xcode versions in different directories i.e. put only one version in Developer. You can use the old Xcode to test your app's compliance vs. a 3.x SDK moving the hard..
Managing multiple asynchronous NSURLConnection connections http://stackoverflow.com/questions/332276/managing-multiple-asynchronous-nsurlconnection-connections this question I track responses in an CFMutableDictionaryRef keyed by the NSURLConnection associated with it. i.e. connectionToInfoMapping CFDictionaryCreateMutable kCFAllocatorDefault 0 kCFTypeDictionaryKeyCallBacks kCFTypeDictionaryValueCallBacks..
Build fat static library (device + simulator) using Xcode and SDK 4+ http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 embed projects inside each other from Xcode 3.x through to Xcode 4.6.x Bonus script to let you auto include Bundles i.e. include PNG files PLIST files etc from your library see below scroll to bottom now supports iPhone5 using Apple's workaround..
Tab Bar Application With Navigation Controller http://stackoverflow.com/questions/369128/tab-bar-application-with-navigation-controller etc. What I would like and cant seem to find an example of is adding a navigation controller to the app so each nib i.e. each tab can drill down to further detail pages. Should I be adding a navigation controller to the main window and creating..
Difference between self.ivar and ivar? http://stackoverflow.com/questions/4142177/difference-between-self-ivar-and-ivar between name @ hello and self.name @ hello Thanks EDIT Follow up question How to write my own setter for an ivar i.e. self.ivar ... iphone objective c ios share improve this question self.name uses the accessor and or mutator defined..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events With abusing this behavior you can make your app be looking like running forever . Register for one background process i.e. VoIP . This will cause your app to be restarted after termination. Now write some Task has to be finished code. According.. it's better to move dispatch_block_t expirationHandler into your headerfile and initialize the code somewhere else i.e. void applicationDidFinishLaunching UIApplication application expirationHandler ^ ... because your app may crash if you..
http://stackoverflow.com/questions/5214197/simple-iphone-motion-detect that's it. Bear in mind that every acceleration will have a counterpart. That means if you apply a force to move i.e. accelerate the device to the right there will be a counterpart for deceleration to stop the motion and let that the device..
http://stackoverflow.com/questions/554997/cancel-a-uiview-animation animation Is it possible to cancel a UIView animation while it is in progress Or would I have to drop to the CA level i.e. I've done something like this maybe setting an end animation action too UIView beginAnimations nil context NULL UIView..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers do its job e.g. reference a global variable . Instead you should always inject those dependencies into the controller i.e. pass in the objects it needs via methods . If you follow the dependency injection pattern your controller will be modular.. your controller will be modular and reusable. And if you think about where the Stanford presenters are coming from i.e. as Apple employees their job is to build classes that can easily be reused reusability and modularity are high priorities... and I can easily use it in my own application assuming BookWarehouse and CheckoutController are generic interfaces i.e. protocols that I can implement @interface MyBookWarehouse NSObject BookWarehouse ... @end @implementation MyBookWarehouse..
Undefined symbols for architecture i386: _OBJC_CLASS_$_SKPSMTPMessage", referenced from: error http://stackoverflow.com/questions/6984368/undefined-symbols-for-architecture-i386-objc-class-skpsmtpmessage-refere from error I have imported framework for sending email from application in background. i have imported framework i.e. SKPSMTPMessage. Can somebody suggest me why i am getting this error Undefined symbols for architecture i386 _OBJC_CLASS_..
iCloud basics and code sample [closed] http://stackoverflow.com/questions/7795629/icloud-basics-and-code-sample copy of text.txt automatically. So there shouldn't be any need for me save anything into the 'old' sandbox of my app i.e. as it used to be in the old pre iCloud days . Right now my sandbox is totally empty but I don't know if this is correct... iCloud void queryDidFinishGathering NSNotification notification 3 if Query is finished this will send the result i.e. either it found our text.dat or it didn't to the next function NSMetadataQuery query notification object query disableUpdates..
Programmatically lock and unlock iPhone screen http://stackoverflow.com/questions/832940/programmatically-lock-and-unlock-iphone-screen lock and unlock iPhone screen How do I programmatically lock and unlock the main screen i.e. the device itself of an iPhone iphone share improve this question It can be done by caling GSEventLockDevice from..
how to create iphone's wobbling icon effect? http://stackoverflow.com/questions/929364/how-to-create-iphones-wobbling-icon-effect
How to delete a user default value in NSUserDefaults? http://stackoverflow.com/questions/1342348/how-to-delete-a-user-default-value-in-nsuserdefaults to delete a user default value in NSUserDefaults I.e. my app sets some standard default values at the beginning. Then those values may get overridden by the user. And when the..
http://stackoverflow.com/questions/2136051/calculating-multiline-text-height-for-uilabel-uitableviewcell-different-results NSLog @ calculated size for @ f f text theSize.width theSize.height This returns 306.000000 84.000000. I.e 4 rows with 17px font and 4px linespacing 21px leading. Good. However later when actually drawing the cell label UILabel..
Core Data cannot resolve faults when object has “description” attribute? http://stackoverflow.com/questions/2169252/core-data-cannot-resolve-faults-when-object-has-description-attribute entity A id 0xf35820 x coredata B01FEC86 14D6 4973 BFDB EDE4AFD24FDC A p6 data prop1 value1 prop2 value2 ... etc ... I.e by the problematic line if the object was of type A it has been faulted and is available in memory but if it is B it's a..
iPhone Core Data “Production” Error Handling http://stackoverflow.com/questions/2262704/iphone-core-data-production-error-handling Error Handling I've seen in the example code supplied by Apple references to how you should handle Core Data errors. I.e NSError error nil if context save error Replace this implementation with code to handle the error appropriately. abort causes..
How to truncate an NSString based on the graphical width? http://stackoverflow.com/questions/2266396/how-to-truncate-an-nsstring-based-on-the-graphical-width share improve this question One option is trying different sizes by looping until you get the right width. I.e. start with the full string if that's wider than what you need replace the last two characters with an ellipsis character...
iPhone Tableview Use Cells in Horizontal Scrolling not Vertical http://stackoverflow.com/questions/2778521/iphone-tableview-use-cells-in-horizontal-scrolling-not-vertical controller that will display cells in a vertical strip down the iphone and the tableview scrolls horizontally. I.e. a 100 normal tableview that is rotated 90deg without rotating the phone orientation Is this possible iphone uitableview..
iPhone Browser simulator for Windows? http://stackoverflow.com/questions/3882233/iphone-browser-simulator-for-windows or any other Windows browser for that matter . So are there any good iPhone Browser simulators that run on windows I.e. that render a site in the same way that the iPhone browser does. Bonus points if there's some way of inspecting the CSS..
http://stackoverflow.com/questions/4213529/saving-uiview-contents-in-ios-4-with-real-size-of-the-images-inside-i-e-scale load with scale 2 I want to save the contents of the UIView ... BUT ... have the real size of the images inside. I.e. the view has size 200x200 and images with scale 2 inside I'd like to save a resulting image of 400x400 and all the images..
Usage of NSException in iPhone Apps http://stackoverflow.com/questions/4310560/usage-of-nsexception-in-iphone-apps by definition unrecoverable why pay the cost of cleanup Consider this call stack your code 1 system code your code 2 I.e. code where your code calls into system code which calls into more of your code a very common pattern though the call stacks..
iPhone different between self and normal variable http://stackoverflow.com/questions/536388/iphone-different-between-self-and-normal-variable accessors for your member variables according to the specifications given in the @property directive in your .h file. I.e. if you specify retain the setter will retain the variable and if you specify copy it will copy it. The accessors will unless..
TableView Crashing/Freezing Because Of Core Data Error http://stackoverflow.com/questions/5454354/tableview-crashing-freezing-because-of-core-data-error That's the name of your xdatamodel. 2 You need to reference your app delegate's context and NOT make one locally. I.e. CurlAppDelegate curlAppDelegate UIApplication sharedApplication delegate NSManagedObjectContext context curlAppDelegate..
NSString retainCount is 2147483647 [duplicate] http://stackoverflow.com/questions/5483357/nsstring-retaincount-is-2147483647 of a second space consuming copy of a constant immutable string and thus returns the already existing constant string. I.e. a singleton. Of a class whose instances are only ever created by the compiler. For which retain release autorelease retainCount..
iPhone Dev - How important is Project.pbxproj? http://stackoverflow.com/questions/5931788/iphone-dev-how-important-is-project-pbxproj your project that Xcode uses to build it the settings the file references configuration targeted platforms etc... I.e. it is a critically important. There really isn't a great answer for this. Typically teams will avoid conflict by limiting..
how to call pin annotation on button click in iphone http://stackoverflow.com/questions/6058939/how-to-call-pin-annotation-on-button-click-in-iphone called by your MapView. This method is only for providing the annotation's view on demand when the mapView needs it. I.e. When the annotation is in or about to move into the mapView's visible region. You need to add an annotation object to your..
how can I Get Chinese Romanization from google API with JSON http://stackoverflow.com/questions/6177615/how-can-i-get-chinese-romanization-from-google-api-with-json API with JSON I want to translate English to Chinese and I got that working but I also need Chinese Romanization. I.e. God should translate to to ç¥ as well as Shén I couldn't get Shén. How can I do this iphone json google api share improve..
How to read objective-c stack traces http://stackoverflow.com/questions/6462214/how-to-read-objective-c-stack-traces was set to call TFSignalHandler . There are situations where a signal handler might be called on a random thread. I.e. there is a minuscule chance that this particular crash had nothing to do with the parser and everything to do with a crash..
Detect key press on virtual keyboard http://stackoverflow.com/questions/6882808/detect-key-press-on-virtual-keyboard son that involves timing on the virtual keyboard. Is possible to detect when a key on the virtual keyboard is pressed I.e. get a touch notification touchesBegan I do not need to know which key is pressed just if and when the press action started...
iCloud basics and code sample [closed] http://stackoverflow.com/questions/7795629/icloud-basics-and-code-sample still work with my text app Or do I simply ignore them Would I need to write separate functions for non iCloud users I.e. functions in which I simply load a text.txt from the documents folder Apple writes Treat files in iCloud the same way you..
Mic input to the speaker output on an iOS device? http://stackoverflow.com/questions/8076850/mic-input-to-the-speaker-output-on-an-ios-device
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