本文介绍了相对于触摸移动 UIView的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试移动与用户触摸相关的 UIView.
i'm trying to move a UIView with relation to the user's touches.
这是我目前所拥有的:
int oldX, oldY;
BOOL dragging;
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self.view];
if (CGRectContainsPoint(window.frame, touchLocation)) {
dragging = YES;
oldX = touchLocation.x;
oldY = touchLocation.y;
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self.view];
if (CGRectContainsPoint(window.frame, touchLocation) && dragging) {
CGRect frame;
frame.origin.x = (window.frame.origin.x + touchLocation.x - oldX);
frame.origin.y = (window.frame.origin.y + touchLocation.y - oldY);
window.frame = frame;
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
dragging = NO;
}
视图不断从一个位置闪烁到另一个位置，我不知道还能做什么.
The view keeps flickering from one location to another, and I don't know what else to do.
感谢任何帮助.
推荐答案
将 touchesBegan 和 touchesMoved 方法修改为如下所示.
Modify the touchesBegan and touchesMoved methods to be like the following.
float oldX, oldY;
BOOL dragging;
touchesBegan:withEvent: 方法.
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self.view];
if (CGRectContainsPoint(window.frame, touchLocation)) {
dragging = YES;
oldX = touchLocation.x;
oldY = touchLocation.y;
}
}
touchesMoved:withEvent: 方法.
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self.view];
if (dragging) {
CGRect frame = window.frame;
frame.origin.x = window.frame.origin.x + touchLocation.x - oldX;
frame.origin.y = window.frame.origin.y + touchLocation.y - oldY;
window.frame = frame;
}
}
touchesEnded:withEvent: 方法.
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
dragging = NO;
}
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