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2014/10/15 ¤U¤È 10:07:26
iphone Programming Glossary: dosomethingTaking time to load the image from URL to UIImageview http://stackoverflow.com/questions/18506744/taking-time-to-load-the-image-from-url-to-uiimageview queue queue completionHandler ^ NSURLResponse response NSData data NSError error if data length 0 error nil doSomething With The data else if error nil error.code ERROR_CODE_TIMEOUT time out error else if error nil download error share improve..
Make a view (initialized from initWithNibName) load all its subview http://stackoverflow.com/questions/1935526/make-a-view-initialized-from-initwithnibname-load-all-its-subview viewController MyViewController alloc initWithNibName @ MyViewController bundle nil viewController.someSubview doSomething later on mainView addSubview viewController.view The problem is that the someSubview object doesn't seem to be loaded until.. The problem is that the someSubview object doesn't seem to be loaded until the view appears so the method doSomething is not called. So far my workaround is to call mainView addSubview viewController.view viewController.view removeFromSuperview..
http://stackoverflow.com/questions/2109257/isnan-in-objective-c
http://stackoverflow.com/questions/3537795/uimenucontroller-custom-items menu item that is shown is my Do Something item. From my TestViewController.m @implementation TestViewController void doSomething id sender NSLog @ Doing something void viewDidLoad UIMenuController menuController UIMenuController sharedMenuController.. UIMenuController sharedMenuController UIMenuItem item UIMenuItem alloc initWithTitle @ Do Something action @selector doSomething autorelease menuController setMenuItems NSArray arrayWithObject item @end Code for my MyTextView.h MyTextView.h #import..
http://stackoverflow.com/questions/3833184/iphone-ipad-context-menu a new menu item looks like this UIMenuItem someAction UIMenuItem alloc initWithTitle @ Something action @selector doSomething UIMenuController menu UIMenuController sharedMenuController menu.menuItems NSArray arrayWithObject someAction menu update..
My custom UI elements are not being updated while UIScrollView is scrolled http://stackoverflow.com/questions/4109898/my-custom-ui-elements-are-not-being-updated-while-uiscrollview-is-scrolled tracking modes so you can just do this NSTimer timer NSTimer timerWithTimeInterval 0.42 target foo selector @selector doSomething userInfo nil repeats YES NSRunLoop currentRunLoop addTimer timer forMode NSRunLoopCommonModes By the way you should do this..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events do sth. here or simply do nothing All your background treads and timers are still being executed while background self doSomething This is where you can do your X minutes in seconds here 10 sleep 10 And never call the expirationHandler so your App runs.. 0 ^ while 1 NSLog @ BGTime left f UIApplication sharedApplication .backgroundTimeRemaining self doSomething sleep 1 void applicationDidEnterBackground UIApplication application BOOL backgroundAccepted UIApplication sharedApplication.. 0 ^ while 1 NSLog @ BGTime left f UIApplication sharedApplication .backgroundTimeRemaining self doSomething sleep 1 After your app has timed out the VoIP expirationHandler will be called where you simply restart a long running..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers DEPENDS on the BookWarehouse object. Don't do this @implementation BookPickerViewController void doSomething I need to do something with the BookWarehouse so I'm going to look it up using the BookWarehouse class method comparable.. BookWarehouse warehouse myBookWarehouse is an instance variable myBookWarehouse warehouse myBookWarehouse retain void doSomething I need to do something with the BookWarehouse object which was injected for me myBookWarehouse listBooks ... When the Apple..
Why should a self-implemented getter retain and autorelease the returned object? http://stackoverflow.com/questions/801828/why-should-a-self-implemented-getter-retain-and-autorelease-the-returned-object variable indirectly generated by the release of its container aLocalVar aContainer getAnInstanceVar aContainer release doSomething aLocalVar If the get is implemented in the first form you should write aLocalVar aContainer getAnInstanceVar retain aContainer.. get is implemented in the first form you should write aLocalVar aContainer getAnInstanceVar retain aContainer release doSomething aLocalVar aLovalVar release The first form is a little bit more efficent in term of code execution speed. However if you..
Possible to pass [self anyFunction] in blocks without __weak object (iOS 5 + ARC) http://stackoverflow.com/questions/9003600/possible-to-pass-self-anyfunction-in-blocks-without-weak-object-ios-5-arc the block. For example object performBlock ^ object performSomeAction Will raise a warning or self performBlock ^ self doSomething Will raise a warning but self performBlock ^ object doSomething No problem here Because an object retains its blocks and.. Will raise a warning or self performBlock ^ self doSomething Will raise a warning but self performBlock ^ object doSomething No problem here Because an object retains its blocks and a block retains it's objects. So in both these cases the object..
iOS - How to know when NSOperationQueue finish processing a few operations? http://stackoverflow.com/questions/9998532/ios-how-to-know-when-nsoperationqueue-finish-processing-a-few-operations @selector done object nil NSInvocationOperation op1 NSInvocationOperation alloc initWithTarget self selector @selector doSomething object nil queue addOperation op1 doneOp addDependency op1 NSInvocationOperation op2 NSInvocationOperation alloc initWithTarget.. doneOp addDependency op1 NSInvocationOperation op2 NSInvocationOperation alloc initWithTarget self selector @selector doSomething object nil queue addOperation op2 doneOp addDependency op2 NSInvocationOperation op3 NSInvocationOperation alloc initWithTarget.. doneOp addDependency op2 NSInvocationOperation op3 NSInvocationOperation alloc initWithTarget self selector @selector doSomething object nil queue addOperation op3 doneOp addDependency op3 queue addOperation doneOp doneOp will only run after op1 op2..
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