iOS:触摸Imageview时发生的事件 [英] IOS: event when an Imageview is touched

问题描述

我有一个带png的ImageView，我想这样做:当有人触摸此imageview时，其alpha更改为0.0，这可能吗?(全部不带按钮)

I have an ImageView with a png and I want to do this: when someone touch this imageview it's alpha change to 0.0, is it possible? (all without buttons)

推荐答案

是的，有可能.例如，您可以按照以下步骤进行操作:

Yes, it is possible. For example you can do that with following steps:

1. 将图像视图的userInteractionEnabled属性设置为YES-这样它将接收触摸事件
2. 向其中添加UITapGestureRecongnizer

3. 在手势处理程序中将视图的Alpha设置为0.0，您也可以使用动画来做到这一点:

1. set image view's userInteractionEnabled property to YES - so it will receive touch events
2. add UITapGestureRecongnizer to it

3. in gesture handler set view's alpha to 0.0, you can do that with animation as well:

[UIView animateWithDuration:0.5 animations:^(void){
        imageView.alpha = 0.0f;
    }];

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