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POhow to replace delegate with block using ARC
 

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  1. POhow to replace delegate with block using ARC
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    <p>I can replace delegate with block using this method: <a href="https://stackoverflow.com/questions/8646476/best-technique-for-replacing-delegate-methods-with-blocks">Best Technique for Replacing Delegate Methods with Blocks</a></p> <p>I use this method to replace delegate:</p> <pre><code>// Generic Block Delegate @interface __DelegateBlock:NSObject typedef void (^HeapBlock)(NSInteger); @property (nonatomic, copy) HeapBlock callbackBlock; @end @implementation __DelegateBlock @synthesize callbackBlock; - (id) initWithBlock:(void(^)(NSInteger))callback { // Init and copy Callback Block to the heap (@see accessor) if (self = [super init]) [self setCallbackBlock:callback]; return [self autorelease]; } - (void) dealloc { // Release the block [callbackBlock release], callbackBlock = nil; [super dealloc]; } - (void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { // Return the result to the callback callbackBlock(buttonIndex); // Detach the block delegate, will decrement retain count SEL key = @selector(alertWithTitle:message:clickedBlock:cancelButtonTitle:otherButtonTitles:); objc_setAssociatedObject(alertView, key, nil, OBJC_ASSOCIATION_RETAIN); key = nil; // Release the Alert [alertView release]; } @end @implementation UIAlertView (BlocksDelegate) + (id) alertWithTitle:(NSString*)title message:(NSString*)message clickedBlock:(void(^)(NSInteger))buttonIndexClickedBlock cancelButtonTitle:(NSString*)cancelButtonTitle otherButtonTitles:(NSString*)otherButtonTitles { // Create class to hold delegatee and copy block to heap DelegateBlock *delegatee = [[__DelegateBlock alloc] initWithBlock:buttonIndexClickedBlock]; [[delegatee retain] autorelease]; // Create delegater UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title message:message delegate:delegatee cancelButtonTitle:cancelButtonTitle otherButtonTitles:otherButtonTitles, nil]; // Attach the Delegate Block class to the Alert View, increase the retain count objc_setAssociatedObject(alert, _cmd, delegatee, OBJC_ASSOCIATION_RETAIN); // Display the alert [alert show]; return alert; } @end </code></pre> <p>I should retain delegate using</p> <pre><code>// Create class to hold delegatee and copy block to heap DelegateBlock *delegatee = [[__DelegateBlock alloc] initWithBlock:buttonIndexClickedBlock]; [[delegatee retain] autorelease]; </code></pre> <p>but how to do it in ARC? </p>
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    1. COWhat does ARC have to do with using blocks instead of delegates? Or are you asking how to convert the referenced code to ARC?
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      1. POhow to replace delegate with block using ARC
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