touchesMoved：withEvent [英] touchesMoved:withEvent

问题描述

我得到了touchesBegan和touchesEnded的坐标。
但是在touchesMoved中，我可以获取从touchesBegan到touchesEnded的所有触摸坐标。
我的意思是当我将手指放在屏幕上并拖动到某个位置然后抬起它时。
因此，我可以获取开始位置到结束位置的所有坐标。
如果可能，我如何获得它们？

I got the coordinates of touchesBegan and touchesEnded. But in touchesMoved can I get all the coordinates of the touch from touchesBegan to touchesEnded. I mean that when I put finger on screen and dragged to some position and then I lifted it. So, can I get all the coordinates of the starting position to end position. If possible, how I can I get them ?

推荐答案

TouchesMoved会在触摸发生移动时被调用。如果需要所有点的数组，则每次调用touchesMoved时都需要将它们添加到可变数组中。

TouchesMoved gets called whenever there is movement on the touch. If you want an array of all points you'll need to add them to a mutable array every time touchesMoved is called.

- (void) touchesMoved: (NSSet *)touches withEvent:(UIEvent *)event {
    CGPoint tappedPt = [[touches anyObject] locationInView: self];
    int     xPos = tappedPt.x;
    int     yPos = tappedPt.y;
    // do something with xPos and yPos like add them to an array
}

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