2014/10/15 下午 10:12:16
iphone Programming Glossary: observersWhat's the nicest way to do observer/observable in objective-c (iphone version) http://stackoverflow.com/questions/165790/whats-the-nicest-way-to-do-observer-observable-in-objective-c-iphone-version in Cocoa Key Value Observing and notifications. In neither system do you need to maintain or notify a collection of observers yourself the framework will handle that for you. Key Value Observing KVO lets you observe a property of an object including..
http://stackoverflow.com/questions/1951826/move-up-uitoolbar this UIToolbar up down iphone keyboard share improve this question add your viewController class to the list of observers of UIKeyboardWillShowNotification UIKeyboardWillHideNotification . then you can move your view to make your textView visible...
Change UITextField background when editing begins http://stackoverflow.com/questions/1993598/change-uitextfield-background-when-editing-begins improve this question You might as well use the UITextFieldDelegate methods IMHO easier to maintain than key value observers #pragma mark #pragma mark UITextFieldDelegate methods BOOL textFieldShouldBeginEditing UITextField textField _field.background..
Select tableview row programmatically http://stackoverflow.com/questions/2035061/select-tableview-row-programmatically tableView didSelectRowAtIndexPath message nor will it send UITableViewSelectionDidChangeNotification notifications to observers. What I would do is void tableView UITableView tableView didSelectRowAtIndexPath NSIndexPath indexPath self doSomethingWithRowAtIndexPath..
Delegates Vs. Notifications in iPhoneOS http://stackoverflow.com/questions/2232694/delegates-vs-notifications-in-iphoneos the delegate message. In many cases the view controller should change the model and then the model should inform its observers or its delegate that it has been changed. Implementing a delegate pattern is simple In your ChildViewController.h declare..
In App Purchase Crashes on [[SKPaymentQueue defaultQueue] addPayment:payment] http://stackoverflow.com/questions/4150926/in-app-purchase-crashes-on-skpaymentqueue-defaultqueue-addpaymentpayment see anywhere where you remove self as an observer. Objects that send out notifications usually do not retain their observers since doing so can create a retain cycle and or a memory leak. In your dealloc code you need to cleanup and call removeTransactionObserver..
Receiving Notifications with App in background mode http://stackoverflow.com/questions/4928207/receiving-notifications-with-app-in-background-mode background mode I have an app that will keep track of everything the user do in the iPod app. To do this I added few observers to NSNotificationCenter like MPMusicPlayerControllerNowPlayingItemDidChangeNotification. But my problem is I only get those..
Is it possible to observe a readonly property of an object in Cocoa Touch? http://stackoverflow.com/questions/549672/is-it-possible-to-observe-a-readonly-property-of-an-object-in-cocoa-touch backing that property directly without seding willChangeValueForKey and didChangeValueForKey notifications then observers will not automatically be notified by the KVO system. If you can verify that the value of this property is changing and.. automatically be notified by the KVO system. If you can verify that the value of this property is changing and your observers are not being notified I would 1 post some code here or elsewhere so that others can help you find your bug and 2 if there..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers for your view controller For communicating back up the hierarchy use loose coupling Define a generic interface for observers like delegation This slide is then followed by what appears to be a place holder slide where the lecturer then apparently.. a time in an object what would the implementation look like for when the lecturer says Define a generic interface for observers like delegation . A pseudocode example would be awfully helpful here if possible. objective c iphone cocoa touch delegates..
Warning in Custom Map Annotations iPhone http://stackoverflow.com/questions/5872547/warning-in-custom-map-annotations-iphone view from navigation bar stack I usually see some warnings in console. MapAnnotation was deallocated while key value observers were still registered with it. Observation info was leaked and may even become mistakenly attached to some other object...
MPMoviePlayerPlaybackDidFinishNotification not being called http://stackoverflow.com/questions/5909138/mpmovieplayerplaybackdidfinishnotification-not-being-called share improve this question Did u read this MPMoviePlayerPlaybackDidFinishNotification Notifies observers that the movie finished playing. The affected movie player is stored in the object parameter of the notification. The userInfo..
I need help restructuring my method with better logic http://stackoverflow.com/questions/6163490/i-need-help-restructuring-my-method-with-better-logic session addExercisesObject exercise if you've added exercises go ahead and save. if you haven't let the observers take care of persisting or destroying it. iphone objective c core data share improve this question This is probably..
NSDefaultRunLoopMode vs NSRunLoopCommonModes http://stackoverflow.com/questions/7222449/nsdefaultrunloopmode-vs-nsrunloopcommonmodes of 𦣇ommon modes see the description of CFRunLoopAddCommonMode for details. CFRunLoopAddCommonMode Sources timers and observers get registered to one or more run loop modes and only run when the run loop is running in one of those modes. Common modes.. in one of those modes. Common modes are a set of run loop modes for which you can define a set of sources timers and observers that are shared by these modes. Instead of registering a source for example to each specific run loop mode you can register.. run loop mode in the common mode set. Likewise when a mode is added to the set of common modes any sources timers or observers already registered to the common pseudo mode are added to the newly added common mode. Can anyone please explain the two..
Setting breakpoint at NSKVODeallocateBreak http://stackoverflow.com/questions/7466652/setting-breakpoint-at-nskvodeallocatebreak to find my bug due to this error An instance 0x1b7ac0 of class AddressAnnotation was deallocated while key value observers were still registered with it. Observation info was leaked and may even become mistakenly attached to some other object...
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