旋转手势改变视图框架

Posted 2023-03-13

【中文标题】旋转手势改变视图框架

【英文标题】：Rotation gesture changing view frame

【发布时间】：2019-09-27 09:03:42

【问题描述】：

我想要实现的目标：我想要创建所选视图的副本。 我在UIView 上有两个UIImageViews。我正在选择这两个视图并希望克隆这两个视图。

在我不旋转 UIImageView 之前一切正常。如果正在旋转视图UIImageView 更改其框架。

UIView *viewClone = [[UIView alloc]initWithFrame:CGRectMake(fltLeadingMin, fltTopMin, fltCloneViewWidth, fltCloneViewHeight)];
viewClone.backgroundColor = [UIColor redColor];

UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(handlePan:)];
[viewClone addGestureRecognizer:panGesture];

for (UIImageView *imgView in arrSelectedViews) 

    NSData *archivedData = [NSKeyedArchiver archivedDataWithRootObject:imgView];
    UIImageView *imgViewClone = [NSKeyedUnarchiver unarchiveObjectWithData:archivedData];

    imgViewClone.frame = CGRectMake(imgViewClone.frame.origin.x - viewClone.frame.origin.x, imgViewClone.frame.origin.y - viewClone.frame.origin.y, imgView.frame.size.width, imgView.frame.size.height);
    imgViewClone.backgroundColor = UIColor.blueColor;

    [viewClone addSubview:imgViewClone];

这是它现在的截图：

【参考方案1】：

旋转图像后，它的框架将不再起作用，这就是您出现问题的原因。

你可以看看Apple document for UIView's transform property

当该属性的值不是恒等变换时，frame 属性中的值是未定义的，应该被忽略。

这种情况的解决方案是使用center 和transform 属性而不是frame。

UIView *viewClone = [[UIView alloc]initWithFrame:CGRectMake(fltLeadingMin, fltTopMin, fltCloneViewWidth, fltCloneViewHeight)];
viewClone.backgroundColor = [UIColor redColor];

UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(handlePan:)];
[viewClone addGestureRecognizer:panGesture];

for (UIImageView *imgView in arrSelectedViews) 

    NSData *archivedData = [NSKeyedArchiver archivedDataWithRootObject:imgView];
    UIImageView *imgViewClone = [NSKeyedUnarchiver unarchiveObjectWithData:archivedData];

    // This is the frame before you rotate image, can be replace with another size
    CGRect originalFrame = CGRectMake(0, 0, 200, 200);
    imgViewClone.frame = originalFrame 

    // Using center and transform instead of current frame
    imgViewClone.center = imgView.center;
    imgViewClone.transform = imgView.transform;

    imgViewClone.backgroundColor = UIColor.blueColor;

    [viewClone addSubview:imgViewClone];