查看透明度和手势处理 [英] View transparency and Gesture handling

问题描述

我目前正在尝试创建一个视图，以处理应用程序中可能发生的所有手势.

I am currently trying to create a View that would handle all the Gesture that could happened on my application.

我希望此视图透明以便将其他视图放在下面，并且它们仍会显示(我不想将它们设为处理视图的子功能)

I would like this view transparent in order to put other view below and they would still display (I don't want to make them subbiews of the handling view)

从现在开始，在我将视图颜色设置为"clearColor"之前，手势处理效果都很好，这是视图消失的原因.除非我坚持使用子视图，否则在这种情况下，只有在点击子视图时才会发生手势.

The Gesture handling works fine until I set the view color on "clearColor" from then, it is has the view disappear. Unless I stick subviews, in this case the gesture are only happening when hitting on subviews.

因此，我的问题是:如何使Gesture事件在透明视图上发生?

My question hence is: How could I manage to have the Gesture event happening on a transparent view?

推荐答案

尝试类似的方法.此代码将两个子视图添加到主视图"bottomView，背景为红色"，然后添加"testView"，该视图为透明的，带有点击手势识别器的"bottomView"顶部的叠加层.如果仍然在"testView"中点击，打印出NSLog消息.希望对您有所帮助.

Try something like this. This code adds two subviews to the main view "bottomView which is has a red background and then "testView" which is transparent an overlay on top of "bottomView" with a tap gesture recognizer. If you tap anyway in the "testView" it will print out the NSLog message. I hope that helps.

-(void)viewDidLoad
{
    [super viewDidLoad];

    UIView *bottomView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
    [bottomView setBackgroundColor:[UIColor redColor]];
    [self.view addSubview:bottomView];    
    UIView *testView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 150)];
    [testView setBackgroundColor:[UIColor clearColor]];
    [self.view addSubview:testView];

    UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] 
                                          initWithTarget:self
                                          action:@selector(handleTap:)];
    [tapRecognizer setNumberOfTapsRequired:1];
    [tapRecognizer setDelegate:testView];
    [testView addGestureRecognizer:tapRecognizer];
}

-(void)handleTap:(UITapGestureRecognizer *)sender 
{
     NSLog(@"Tapped Subview");
}

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