一个从UIImageView中获得Image位置的函数
(CGRect)getFrameSizeForImage:(UIImage *)image inImageView:(UIImageView *)imageView { float hfactor = image.size.width / imageView.frame.size.width; float vfactor = image.size.height / imageView.frame.size.height; float factor = fmax(hfactor, vfactor); // Divide the size by the greater of the vertical or horizontal shrinkage factor float newWidth = image.size.width / factor; float newHeight = image.size.height / factor; // Then figure out if you need to offset it to center vertically or horizontally float leftOffset = (imageView.frame.size.width - newWidth) / 2; float topOffset = (imageView.frame.size.height - newHeight) / 2; return CGRectMake(leftOffset, topOffset, newWidth, newHeight);}