Question

我正在通过代码制作动态UIViews并尝试在其上添加UITapGestureRecogniser。但由于某种原因，他们没有回应。这是代码：

-(void)createRandomBlock{
    UIView * block = [[UIView alloc] initWithFrame:CGRectMake([self getRandomPosition], 0-_heightOfBlock, _widthOfBlock, _heightOfBlock)];
    block.backgroundColor = [self randomColor];
    block.userInteractionEnabled=YES;

    UITapGestureRecognizer * tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(blockTapped:)];
    tapGesture.delegate = self;
    tapGesture.numberOfTouchesRequired = 1;
    tapGesture.numberOfTapsRequired=1;
    [block addGestureRecognizer:tapGesture];

    [self.view addSubview:block];

    [UIView animateWithDuration:_durationOfAnimation delay:0.0 options:options animations:^{
        [block setFrame:CGRectMake(block.frame.origin.x, ScreenHeight, block.bounds.size.width, block.bounds.size.height)];
    } completion:^(BOOL finished) {
        [block removeFromSuperview];
    }];
}

-(void)blockTapped:(UITapGestureRecognizer*)gesture{
    NSLog(@"I am being called?");
    UIView * block = (UIView*)[gesture view];
    [block removeFromSuperview];
}

有人可以帮忙吗？

由于

Answer 1

你可以在框架上犯错误。请更改框架组＆amp;你可以解决你的问题。

-(void)createRandomBlock{
    int x_coord = arc4random() % 200; //Random number from 0-320  // set random x position 
    int y_coord = arc4random() % 481; //Random number from 0-480  // set random y position

    UIView * block = [[UIView alloc] initWithFrame:CGRectMake(x_coord, y_coord, 100, 100)]; // for testing set width & height 100 * 100
    block.backgroundColor = [UIColor redColor]; // for fix color you can use your change color function
    block.userInteractionEnabled=YES;

    UITapGestureRecognizer * tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(blockTapped:)];
    tapGesture.delegate = self;
    tapGesture.numberOfTouchesRequired = 1;
    tapGesture.numberOfTapsRequired=1;
    [block addGestureRecognizer:tapGesture];

    [self.view addSubview:block];

[UIView animateKeyframesWithDuration:1.0 delay:0.0 options:UIViewKeyframeAnimationOptionCalculationModeLinear animations:^{
        [block setFrame:CGRectMake(block.frame.origin.x, 0, block.bounds.size.width, block.bounds.size.height)];
    } completion:^(BOOL finished) {
//        [block removeFromSuperview];
    }];
}

-(void)blockTapped:(UITapGestureRecognizer*)gesture{
    NSLog(@"I am being called?");
    UIView * block = (UIView*)[gesture view];
    [block removeFromSuperview];
}

Answer 2

我尝试使用相同的代码，它对我有用。 仅更改内容，我没有为tapGesture 设置委托。

-(void)createRandomBlock{
    UIView * block = [[UIView alloc] initWithFrame:randomPosition];
    block.backgroundColor = [self randomColor];
    block.userInteractionEnabled=YES;

    UITapGestureRecognizer * tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(blockTapped:)];
    tapGesture.numberOfTapsRequired=1;
    [block addGestureRecognizer:tapGesture];

    [self.view addSubview:block];
}

-(void)blockTapped:(UITapGestureRecognizer*)gesture{
    NSLog(@"I am being called?");
    UIView * block = (UIView*)[gesture view];
    [block removeFromSuperview];
}

我想因为添加了委托，它会覆盖你指定的选择器，而是调用委托方法。

Answer 3

如果您的顶级视图的用户互动已停用，则您的手势也无法识别子视图上的互动。尝试在调用createRandomBlock消息之前在某处添加休息行。

self.view.userInteractionEnabled = YES;

Answer 4

我不知道你的[self getRandomPosition]和_widthOfBlock等有什么价值，否则在我的演示中代码工作正常。

 -(void)createRandomBlock{

UIView * block = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
block.backgroundColor = [UIColor redColor];
block.userInteractionEnabled=YES;

UITapGestureRecognizer * tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(blockTapped:)];
tapGesture.delegate = self;
tapGesture.numberOfTouchesRequired = 1;
tapGesture.numberOfTapsRequired=1;
[block addGestureRecognizer:tapGesture];

[self.view addSubview:block];
}

-(void)blockTapped:(UITapGestureRecognizer*)gesture{
NSLog(@"I am being called?");
UIView * block = (UIView*)[gesture view];
[block removeFromSuperview];
}

更新：

您应该使用touchesBegan来识别触摸，这是工作代码，

-(void)createRandomBlock{

UIView * block = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
block.backgroundColor = [UIColor redColor];
block.userInteractionEnabled=YES;
block.tag = 100;
self.view.userInteractionEnabled =YES;

UITapGestureRecognizer * tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(blockTapped:)];
//  tapGesture.delegate = self;
// tapGesture.numberOfTouchesRequired = 1;
tapGesture.numberOfTapsRequired=1;


[block addGestureRecognizer:tapGesture];
[self.view addSubview:block];




 [UIView animateWithDuration:5.0 delay:0.0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
    [block setFrame:CGRectMake(block.frame.origin.x, self.view.frame.size.height-200, block.bounds.size.width, block.bounds.size.height)];


} completion:^(BOOL finished) {
    [block removeFromSuperview];
}];


}

-(void)blockTapped:(UITapGestureRecognizer*)gesture{

NSLog(@"I am being called?");
UIView * block = (UIView*)[gesture view];
[block removeFromSuperview];
}


- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint touchLocation = [touch locationInView:self.view];
UIView *tempView = [self.view viewWithTag:100];

if ([tempView.layer.presentationLayer hitTest:touchLocation]) {

    NSLog(@"call");
    [tempView removeFromSuperview];
}


}

Answer 5

您正在删除完成块中的视图，这意味着在完成动画后，您的视图将被删除。从完成块中删除以下行。

[block removeFromSuperview];

你不应该这样做。您的视图本身将被删除Tap Gesture的工作方式。

UITapGesture没有动态创建UIViews

5 个答案: