点击检测无法在UIImageView上运行 [英] Tap detection not working on UIImageView

问题描述

在我的.m文件中，我添加了：

In my .m file I added:

@property (strong, nonatomic) UIImageView *star1;

然后在我做的方法中：

UIImage *star1Image;
star1Image = [UIImage imageNamed:@"staryes"];
self.star1 = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 32, 32)];
self.star1.tag = 800;
[self.star1 setImage:star1Image];
[ratingLabelBody addSubview:self.star1];

在与此无关的几行后，我有：

After a few lines not related to this I have:

[self.star1 setUserInteractionEnabled:YES];
UITapGestureRecognizer *tapped = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imgTouchUp:)];
tapped.numberOfTapsRequired = 1;
[self.star1 addGestureRecognizer:tapped];

最后在我实施的.m文件中：

And finally in the .m file I have implemented:

-(void)imgTouchUp:(id)sender {
    NSLog(@"imgTouchUp");
    UITapGestureRecognizer *gesture = (UITapGestureRecognizer *)sender;
    NSLog(@"tap detected on %li", (long)gesture.view.tag);
}

有了这一切，它应该识别我的图像上的点击但没有发生任何事情。有什么想法？

With all this, it should recognize the tap on my image but nothing is happening. Any idea?

推荐答案

因此，因为 UILabel 或<$等组件c $ c> UIImageView 不是设计为可触摸，添加可触摸功能（如 UITapRecognizer ），你有将 userInteractionEnabled 设置为 YES 。

So, since components like UILabel or UIImageView aren't design to be "touchable", to add a "touchable" feature (like a UITapRecognizer), you have to set their userInteractionEnabled to YES.

所以，即使您为 UIImageView （ star1 ）正确设置此属性，因为您将其添加为<$的子视图c $ c> ratingLabelBody ，你无法触发 UITapGestureRecognizer （ imgTouchUp：） 。$
您必须对 star1 的父视图执行相同操作，即 ratingLabelBody 。

So, even if you set this property correctly for your UIImageView (star1), since you add it as a subview of ratingLabelBody, you couldn't trigger your UITapGestureRecognizer (imgTouchUp:).
You have to do the same to the parent view of your star1, which is ratingLabelBody.

使用代码进行翻译，您必须这样做：

Translated with code, you just had to do:

[ratingLabelBody setUserInteractionEnabled:YES];

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