UI控件与Block的灵活使用

static char * const UIViewBlockKey = "UIHelperViewBlockKey";

@interface UIView (UIHelper)

+ (UIView *) viewWithtouchesBegan:( void(^)(NSSet *touches, UIEvent *event) ) touchesBeganBlock
                     touchesMoved:( void(^)(NSSet *touches, UIEvent *event) ) touchesMovedBlock
                     touchesEnded:( void(^)(NSSet *touches, UIEvent *event) ) touchesEndedBlock
                 touchesCancelled:( void(^)(NSSet *touches, UIEvent *event) ) touchesCancelledBlock;

@end

@implementation UIView (UIHelper)

+ (UIView *) viewWithtouchesBegan:( void(^)(NSSet *touches, UIEvent *event) ) touchesBeganBlock
                     touchesMoved:( void(^)(NSSet *touches, UIEvent *event) ) touchesMovedBlock
                     touchesEnded:( void(^)(NSSet *touches, UIEvent *event) ) touchesEndedBlock
                 touchesCancelled:( void(^)(NSSet *touches, UIEvent *event) ) touchesCancelledBlock
{
    UIView *theView = [[UIView alloc] init];
    
    NSArray *opreations = (NSArray *)objc_getAssociatedObject(theView, UIViewBlockKey);
    if (opreations == nil)
    {
        opreations = [[NSArray arrayWithObjects:touchesBeganBlock, touchesMovedBlock, touchesEndedBlock, touchesCancelledBlock, nil] retain];
        objc_setAssociatedObject(theView, UIViewBlockKey, opreations, OBJC_ASSOCIATION_RETAIN);
    }
    
    return [theView autorelease];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSArray *opreations = (NSArray *)objc_getAssociatedObject(self, UIViewBlockKey);
    
    void(^handle)(NSSet *touches, UIEvent *event) = [opreations objectAtIndex:0];
    if (handle == nil)
    {
        return;
    }
    
    handle(touches, event);
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSArray *opreations = (NSArray *)objc_getAssociatedObject(self, UIViewBlockKey);
    
    void(^handle)(NSSet *touches, UIEvent *event) = [opreations objectAtIndex:1];
    if (handle == nil)
    {
        return;
    }
    
    handle(touches, event);
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSArray *opreations = (NSArray *)objc_getAssociatedObject(self, UIViewBlockKey);
    
    void(^handle)(NSSet *touches, UIEvent *event) = [opreations objectAtIndex:2];
    if (handle == nil)
    {
        return;
    }
    
    handle(touches, event);
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSArray *opreations = (NSArray *)objc_getAssociatedObject(self, UIViewBlockKey);
    
    void(^handle)(NSSet *touches, UIEvent *event) = [opreations objectAtIndex:3];
    if (handle == nil)
    {
        return;
    }
    
    handle(touches, event);
}

@end

//使用方法***************
    
    UIView *aView = [UIView viewWithtouchesBegan:^(NSSet *touches, UIEvent *event) {
        NSLog(@"touchesBegan");
    } touchesMoved:^(NSSet *touches, UIEvent *event) {
        NSLog(@"touchesMoved");
    } touchesEnded:^(NSSet *touches, UIEvent *event) {
        NSLog(@"touchesEnded");
    } touchesCancelled:^(NSSet *touches, UIEvent *event) {
        NSLog(@"touchesCancelled");
    }];
    aView.frame = CGRectMake(100, 0, 100, 44);
    aView.backgroundColor = [UIColor redColor];
    [self.window addSubview:aView];