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);
}

废话不多说贴代码。再stackOverflow中找到的马克下！