拖动数组中的多个 UIImageView答案

【问题标题】：Drag multiple UIImageViews in an Array拖动数组中的多个 UIImageView
【发布时间】：2012-11-16 04:34:54
【问题描述】：

这是我目前所拥有的

-(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，这就是我所做的让它工作

-(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)];

        }
}
}

【问题讨论】：

标签： objective-c ios drag-and-drop uiimageview touch

【解决方案1】：

那是因为您将它们全部移动到同一位置，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。下面的代码应该可以解决您的问题！忘记 touchesBegan 并像这样覆盖 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)];
    }
}

如果您想在点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！

【讨论】：

这真的很好，唯一的事情是我希望图像现在分开移动，它们都一起移动。非常感谢。
@Jonathan 将它们分别移动查看我编辑的答案，希望对您有所帮助！
@Jonathan 再次编辑有一些小故障！试试看能不能解决你的问题！
非常感谢你的工作我只需要稍微调整你的代码，它所做的是当你触摸它会射击到（0,0）原点的对象然后我可以拖动它大约。我刚刚结合了你的两个代码，它工作了。

【解决方案2】：

在这里你只是这样编码。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。

【讨论】：