无需触摸图像即可拖动 UIImageView？ [关闭]

Posted 2023-03-08

【中文标题】无需触摸图像即可拖动 UIImageView？ [关闭]

【英文标题】：Dragging a UIImageView without having to touch the Image? [closed]

【发布时间】：2014-04-03 19:48:05

【问题描述】：

我的应用有一个 UIView，其中有一个 UIImageView。用户需要能够移动该图像，但不一定要触摸该图像。

【参考方案1】：

只要声明

NSInteger offsetX;
NSInteger offsetY;

并在您的视图控制器中实现以下方法：

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

    //Get touch coordinates in location view
    UITouch *touch = [touches anyObject];
    CGPoint touchPoint = [touch locationInView:self.view];

    //Calculate offset on touches began
    offsetX = touchPoint.x - imageView.frame.origin.x;
    offsetY = touchPoint.y - imageView.frame.origin.y;



-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event

    //Get touch coordinates in location view
    UITouch *touch = [touches anyObject];
    CGPoint touchPoint = [touch locationInView:self.view];

    //Create new frame with origin offset
    CGRect newFrame = CGRectMake(touchPoint.x - offsetX, touchPoint.y - offsetY, imageView.bounds.size.width, imageView.bounds.size.height);

    //Set the new frame
    imageView.frame = newFrame;

【讨论】：

正是我想要的！非常感谢您的快速回答！