好的，所以我意识到我可以从图层的CATransform3D中找到比例值，如下所示:
float scale = [[layer valueForKeyPath: @"transform.scale"] floatValue];
但是我无法终生想出如何从CGAffineTransform中找到比例值。举例来说，我有一个名为“cameraTransform”的CGAffineTransform:
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
CGAffineTransform *cameraTransform = imagePicker.cameraViewTransform;
现在如何从cameraTransform获取比例值？
最佳答案
The Quartz 2D Programming Guide tells you where to find the scale values.与the definition of the CGAffineTransform structure进行比较。