iOS UIImageView图片添加点击事件

其实很简单，用的就是UITapGestureRecognizer，但是UIImageView的userInteractionEnabled属性默认是NO，对，你没看错，NO！！！

所以要把这个参数设置成YES。亲测管用，上代码：

    UIImage *img = [UIImage imageWithContentsOfFile:@"/Users/jinhui005/Desktop/style_img.png"];
    UIImageView *imgView = [[UIImageView alloc] initWithImage:img];
    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(clickImage)];
    [imgView addGestureRecognizer:tapGesture];
    imgView.userInteractionEnabled = YES;