Question

这是我到目前为止所拥有的

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

    UITouch *touch = [[event allTouches] anyObject];

    for (UIImageView *imageView in _imageViewArray) {
            CGPoint Location = [touch locationInView:touch.view];
            imageView.center = Location;
    }   
}

我面临的问题是当我移动一张图像时，它们都会跳到同一个地方。

感谢cyberpawn这就是我做了它让它工作

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];

    CGPoint oldPoint = [touch previousLocationInView:touch.view];
    CGPoint newPoint = [touch locationInView:touch.view];

    CGPoint diff = CGPointMake(newPoint.x - oldPoint.x, newPoint.y - oldPoint.y);

    for (UIImageView *imageView in _imageViewArray) {
        if (CGRectContainsPoint(imageView.frame, newPoint)) {
            CGPoint cntr = [imageView center];
            [imageView setCenter:CGPointMake(cntr.x + diff.x, cntr.y + diff.y)];

        }
}
}

Answer 1

这是因为您将它们全部移动到相同位置，您需要计算触摸位置之间的差异并将该位移添加到所有视图。下面的代码应该解决你的问题！忘记touchesBegan和Just覆盖touchesMoved方法。

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];

    CGPoint oldPoint = [touch previousLocationInView:touch.view];
    CGPoint newPoint = [touch locationInView:touch.view];

    CGPoint diff = CGPointMake(newPoint.x - oldPoint.x, newPoint.y - oldPoint.y);

    for (UIImageView *imageView in _imageViewArray) {
        CGPoint cntr = [imageView center];
        [imageView setCenter:CGPointMake(cntr.x + diff.x, cntr.y + diff.y)];
    }
}

如果您想在单击其中任何一个时单独移动它们而不是使用下面的代码！

float oldX, oldY;

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];
    CGPoint pt = [touch locationInView:touch.view];
    for (UIImageView *imageView in _imageViewArray) {
        if(CGRectContainsPoint(imageView.frame, pt)) {
            oldX = imageView.center.x - imageView.frame.origin.x - pt.x;
            oldY = imageView.center.y - imageView.frame.origin.y - pt.y;
            break;
        }
    }
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint pt = [touch locationInView:touch.view];

    for (UIImageView *imageView in _imageViewArray) {
        if (CGRectContainsPoint(imageView.frame, pt)) {
            [self setCenter:CGPointMake(pt.x+oldX, pt.y+oldY)];
        }
    }

享受编程！

Answer 2

这里你只是编码。如果要移动单个图像，则必须找到该图像，并且应该单独移动该图像。

在Array中拖动多个UIImageViews

2 个答案: