iphone - 找捏手势的点

Question

我对 UIGestures 很熟悉，但这种特殊的需求让我碰壁了。

问题：如何找到 UIPinchGesture 的起点和终点？

我必须得到所有这四个点，并且必须在服务器端进行一些计算。

以前有人试过吗？

Answer 1

利用

- (CGPoint)locationOfTouch:(NSUInteger)touchIndex inView:(UIView *)view

喜欢

[gesture locationOfTouch:0 inView:youView]; //first
[gesture locationOfTouch:1 inView:youView]; //second

Answer 2

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touchPositionOne = [[[event allTouches] allObjects] objectAtIndex:0];
UITouch *touchPositionTwo = [[[event allTouches] allObjects] objectAtIndex:1];
CGPoint fps = [touchPositionOne locationInView:self.imageView];
CGPoint sps = [touchPositionTwo locationInView:self.imageView];

NSLog(@"%@ %@", NSStringFromCGPoint(fps), NSStringFromCGPoint(sps));
}


- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touchPositionOne = [[[event allTouches] allObjects] objectAtIndex:0];
UITouch *touchPositionTwo = [[[event allTouches] allObjects] objectAtIndex:1];
CGPoint fps = [touchPositionOne locationInView:self.imageView];
CGPoint sps = [touchPositionTwo locationInView:self.imageView];

NSLog(@"%@ %@", NSStringFromCGPoint(fps), NSStringFromCGPoint(sps));
}

Answer 3

CGPoint point1 = [gestureRecognizer locationOfTouch:0 inView:piece];
CGPoint point2 = [gestureRecognizer locationOfTouch:1 inView:piece];
CGPoint center = [gestureRecognizer locationInView:piece];

Answer 4

我认为在 XCode 12 中您可以使用 location(ofTouch:, in:) 来识别点的位置：

print(sender.location(ofTouch: 0, in: view))
print(sender.location(ofTouch: 1, in: view))