ios关联对象给UIView添加tapBlock

#import "UIView+tap.h"
#import <objc/runtime.h>

static char kActionHandlerTapGestureKey;
static char kActionHandlerTapBlockKey;

@implementation UIView (tap)

- (void)setTapWithBlock:(void(^)(void))block {
    UITapGestureRecognizer *tap = objc_getAssociatedObject(self, &kActionHandlerTapGestureKey);
    if (!tap) {
        tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onTap:)];
        [self addGestureRecognizer:tap];
        objc_setAssociatedObject(self, &kActionHandlerTapGestureKey, tap, OBJC_ASSOCIATION_RETAIN);
    }
    objc_setAssociatedObject(self, &kActionHandlerTapBlockKey, block, OBJC_ASSOCIATION_COPY);
}

- (void)onTap:(UITapGestureRecognizer *)gesture {
    if (gesture.state == UIGestureRecognizerStateRecognized) {
        void(^action)(void) = objc_getAssociatedObject(self, &kActionHandlerTapBlockKey);
        if (action) {
            action();
        }
    }
}

@end

use:

- (void)viewDidLoad {
    [super viewDidLoad];
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
    view.backgroundColor = [UIColor redColor];
    [view setTapWithBlock:^{
        NSLog(@"tap");
    }];
    [self.view addSubview:view];
}