ios - 如何使用 ARC 制作 UIBlockButton 套装？

Question

我正在使用来自 this post 的 UIBlockButton 代码:

typedef void (^ActionBlock)();

@interface UIBlockButton : UIButton {
  ActionBlock _actionBlock;
}

-(void) handleControlEvent:(UIControlEvents)event 
                 withBlock:(ActionBlock) action;

@implementation UIBlockButton

-(void) handleControlEvent:(UIControlEvents)event 
                 withBlock:(ActionBlock) action
{
  _actionBlock = Block_copy(action);
  [self addTarget:self action:@selector(callActionBlock:) forControlEvents:event];
}

-(void) callActionBlock:(id)sender{
  _actionBlock();
}

-(void) dealloc{
  Block_release(_actionBlock);
  [super dealloc];
}
@end

但我将代码更改为在 ARC 下，如何更改代码以确保一切正常？

Answer 1

标题:

@interface UIBlockButton : UIButton

- (void) handleControlEvent: (UIControlEvents) event withBlock: (dispatch_block_t) action;

@end

实现:

@interface UIBlockButton ()
@property(copy) dispatch_block_t actionBlock;
@end

@implementation UIBlockButton
@synthesize actionBlock;

- (void) handleControlEvent: (UIControlEvents) event withBlock: (dispatch_block_t) action
{
    [self setActionBlock:action];
    [self addTarget:self action:@selector(callActionBlock:) forControlEvents:event];
}

- (void) callActionBlock: (id) sender
{
    if (actionBlock) actionBlock();
}

@end

但请注意，多次调用 handleControlEvent:withBlock: 将覆盖您的 block ，您不能使用此实现对不同的事件执行不同的操作。此外，您可能应该为该类使用不同的前缀而不是 UI，以防止与 Apple 代码发生潜在冲突。