uiimageview 读取uiimage的大小

UIImage* image = [UIImage imageNamed:@"image.png"];

   UIImageView* imageView = [[[UIImageView alloc] initWithImage:image] autorelease];

   imageView.frame = CGRectMake(0, 0, 300, 200);

   imageView.layer.cornerRadius = 8;  
   imageView.layer.masksToBounds = YES;

///显示图片大小
    imageView1.contentMode = UIViewContentModeCenter;