IOS-UIImageView 圖片自適應大小

<pre name="code" class="objc">UIImageView *imageView = [[UIImageView alloc] initWithFrame:frame];
imageView.contentMode = UIViewContentModeScaleToFill;
imageView.clipsToBounds = YES;
imageView.autoresizesSubviews = YES;
imageView.autoresizingMask =
            UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;

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