查找捏手势

Question

我熟悉UIGestures，但这种特殊的需求让我撞上了墙壁。

问题：如何查找UIPinchGesture的开始两点和结束点？

我必须得到所有这四点，并且必须在服务器端进行一些计算。

有人曾尝试过吗？

Answer 1

- (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 2

使用

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

像

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

Answer 3

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