ios - iPhone - 沿触摸和拖动路径移动对象

Question

我正在开发一个简单的动画，其中 UIImageView 沿着 UIBezierPath 移动，现在我想为移动的 UIImageView 提供用户交互，所以该用户可以通过触摸 UIImageView 并在屏幕上拖动 UIImageview 来引导 UIImageView。

Answer 1

更改touchesMoved:withEvent:中 ImageView 位置的框架.

编辑:一些代码

- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
    UITouch *touch = [[event allTouches] anyObject];
    if ([touch.view isEqual: self.view] || touch.view == nil) {
        return;
    }

    lastLocation = [touch locationInView: self.view];
}

- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event {
    UITouch *touch = [[event allTouches] anyObject];
    if ([touch.view isEqual: self.view]) {
        return;
    }

    CGPoint location = [touch locationInView: self.view];

    CGFloat xDisplacement = location.x - lastLocation.x;
    CGFloat yDisplacement = location.y - lastLocation.y;

    CGRect frame = touch.view.frame;
    frame.origin.x += xDisplacement;
    frame.origin.y += yDisplacement;
    touch.view.frame = frame;
    lastLocation=location;
}

您还应该实现 touchesEnded:withEvent: 和 touchesCanceled:withEvent:。