Databases
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    <p>Here's a working category implementation. In it's current form, this should only be used in <code>DEBUG</code>. I use this category in conjunction with a function (included below) to test various bits of code when user interaction and timing are important. Again this is only for development/debug purposes and shouldn't be considered for production, hence the <code>#ifdef DEBUG</code> ;)</p> <pre><code>#ifdef DEBUG #import &lt;objc/runtime.h&gt; static char UIButtonBlockKey; @interface UIButton (UIBlockButton) - (void)handleControlEvent:(UIControlEvents)event withBlock:(ActionBlock)block; - (void)callActionBlock:(id)sender; @end @implementation UIButton (UIBlockButton) - (void)handleControlEvent:(UIControlEvents)event withBlock:(ActionBlock)block { objc_setAssociatedObject(self, &amp;UIButtonBlockKey, block, OBJC_ASSOCIATION_COPY_NONATOMIC); [self addTarget:self action:@selector(callActionBlock:) forControlEvents:event]; } - (void)callActionBlock:(id)sender { ActionBlock block = (ActionBlock)objc_getAssociatedObject(self, &amp;UIButtonBlockKey); if (block) { block(); } } @end void DSAddGlobalButton(NSString *title, ActionBlock block) { UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [button setTitle:title forState:UIControlStateNormal]; [button handleControlEvent:UIControlEventTouchUpInside withBlock:block]; [button sizeToFit]; [button setFrame:(CGRect){{100.0f, 100.0f}, [button frame].size}]; UIView *firstView = [[[[UIApplication sharedApplication] keyWindow] subviews] objectAtIndex:0]; [firstView addSubview:button]; } #endif </code></pre>
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