如何给View添加点击事件

项目中有很多地方需要添加点击事件,重复代码很多,所以做了一个UIView的分类,专门做点击事件使用.
项目地址:UIView-Tap

代码很简单,主要有一点就是注意分类不能直接添加属性,需要用到运行时相关内容.

代码如下:

\\UIView+Tap.h文件
@interface UIView (Tap)
- (void)addTapBlock:(void(^)(id obj))tapAction;
@end

\\UIView+Tap.m文件
#import <objc/runtime.h>

static const void* tagValue = &tagValue;

@interface UIView ()
@property (nonatomic, copy) void(^tapAction)(id);
@end

@implementation UIView (Tap)
- (void)tap{
    if (self.tapAction) {
        self.tapAction(self);
    }
}
- (void)addTapBlock:(void(^)(id obj))tapAction{
    self.tapAction = tapAction;
    if (![self gestureRecognizers]) {
        self.userInteractionEnabled = YES;
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap)];
        [self addGestureRecognizer:tap];
    }
}

-(void)setTapAction:(void (^)(id))tapAction {
    objc_setAssociatedObject(self, tagValue, tapAction, OBJC_ASSOCIATION_COPY_NONATOMIC);
}
-(void (^)(id))tapAction {
    return objc_getAssociatedObject(self, tagValue);
}
@end

正如大家所见,如果要接收点击事件,必须userInteractionEnabled设置为YES,所以不管怎么只要确认要给视图添加点击事件,都会被设置为userInteractionEnabled = YES

简单实用:

UIView *redView = [[UIView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
redView.backgroundColor = [UIColor redColor];
[redView addTapBlock:^(UIView* obj) {
    NSLog(@"redView%@",obj.backgroundColor);
}];
[self.view addSubview:redView];

UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(50, 250, 100, 100)];
imageView.image = [UIImage imageNamed:@"icon"];
[imageView addTapBlock:^(UIImageView* obj) {
    NSLog(@"imageView:\n%@",obj.image);
}];
[self.view addSubview:imageView];

UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(150, 400, 100, 100)];
label.text = @"这是label,点击这里...";
[label addTapBlock:^(UILabel* obj) {
    NSLog(@"label:\n%@",obj.text);
}];
[self.view addSubview:label];