如何在呈现popover之前获取触摸坐标？

在我的代码中，我需要获取触摸之前的坐标来呈现弹出窗口。这是代码：如何在呈现popover之前获取触摸坐标？

UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)]; 
[tapRecognizer setNumberOfTapsRequired:1]; 
[tapRecognizer setDelegate:self]; 
[self.view addGestureRecognizer:tapRecognizer]; 
FreeAndNil(tapRecognizer); 

ratingSliderViewController = [[CMRatingSliderViewController alloc] init]; 
ratingPopoverController = [[UIPopoverController alloc] initWithContentViewController:ratingSliderViewController]; 
[ratingPopoverController setDelegate:self]; 
[ratingPopoverController setPopoverContentSize:CGSizeMake(360.0, 50.0)]; 
[self setPopoverController:ratingPopoverController]; 
[ratingPopoverController presentPopoverFromRect:CGRectMake(latestTouchPoint.x, latestTouchPoint.y, 10.0,10.0) inView:detailView permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES]; 

[self.view removeGestureRecognizer:tapRecognizer]; 


... 

} 

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    UITouch *touch = [touches anyObject]; 
    latestTouchPoint = [touch locationInView:self.view]; 
}

然而酥料饼是touchesBegan调用之前提出。我该如何解决这个问题？我宁愿不使用延迟或运行通用的touchesBegan方法中的弹出窗口代码。

来源

2013-05-01 aneuryzm

我不明白 - 您只需将手势添加到视图中，然后显示弹出式视图即可。你为什么认为pop tou会在touchesBegan之前出现？ touchesBegan只会在用户触摸self.view时调用...... – 2013-05-01 11:51:32

@AviTsadok我已经意识到touchesBegan从来没有被调用过，但我无法弄清楚我的代码中有什么问题 – aneuryzm 2013-05-01 12:06:52

首先，touchesBegan是一个UIView方法，而不是View Controller方法，这就是为什么它从来没有被调用。其次，如果你添加了轻击手势，为什么你需要覆盖touchesBegan方法（你在错误的地方做过）？ – 2013-05-01 12:08:49

首先在视图加载时添加手势识别器。

@property (nonatomic, strong) UITapGestureRecognizer *tapRecognizer; 


- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    _tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)]; 
    [_tapRecognizer setNumberOfTapsRequired:1]; 
    [self.view addGestureRecognizer:_tapRecognizer]; 
}

另外，还要确保你目前的自来水识别处理功能，而不是在声明它里面的酥料饼（如你现在要做的）！

-(void) tapRecognizer:(UITapGestureRecognizer *)tabRecognizer{ 

    CGPoint touchedPoint = [gestureRecognizer locationInView:self.view]; 
    NSLog(@"Point x %f x %f", aPoint.x, aPoint.y); 

    ratingSliderViewController = [[CMRatingSliderViewController alloc] init]; 
    ratingPopoverController = [[UIPopoverController alloc] initWithContentViewController:ratingSliderViewController]; 
    [ratingPopoverController setDelegate:self]; 
    [ratingPopoverController setPopoverContentSize:CGSizeMake(360.0, 50.0)]; 
    [self setPopoverController:ratingPopoverController]; 
    [ratingPopoverController presentPopoverFromRect:CGRectMake(touchedPoint,  touchedPoint, 10.0,10.0) inView:detailView permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES]; 
}

来源

2013-05-01 11:53:15

您可以使用此委托方法添加委托手势获得，

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch

来源

2013-05-01 11:54:11 Balu

我已经找到了解决方案（需要一些JavaScript）位置：http://www.mindfirelabs.com/forum/viewtopic.php?f=10&t=142

来源

2013-05-01 15:17:00 aneuryzm

如何在呈现popover之前获取触摸坐标？

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