Ios UIImageView&；CGAffineTransformScale，路径错误

我正在尝试为图像添加边框（UIImageView），除了一件事外，其他一切都正常：当我调整图像大小时，我的形状变大（或变小）。下面是一些代码：

 CGPoint center = view.center; // view is a UIImageView
 CGAffineTransform transform = CGAffineTransformIdentity;
 CGFloat angle = [(NSNumber *)[view valueForKeyPath:@"layer.transform.rotation.z"] floatValue];
 CGFloat scale = [(NSNumber *)[view valueForKeyPath:@"layer.transform.scale"] floatValue];
 transform = CGAffineTransformTranslate(transform, center.x, center.y);
 transform = CGAffineTransformScale(transform, scale, scale);
 transform = CGAffineTransformRotate(transform, angle);
 transform = CGAffineTransformTranslate(transform, -center.x, -center.y);
 CGPathRef path = CGPathCreateWithRect(view.frame, &transform); // looks like the problem is here
 shape.path = path; // shape is a CAShapeLayer
 CGPathRelease(path);

通过替换解决

CGPathRef path = CGPathCreateWithRect(view.frame, &transform); 

与

CGPathAddLines(path, nil, points, 5);