Need help about contentMode and autoresizingMask of UIImageView

i have picture like this image it will present on Landscape Mode

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so if rotate device to Portrait, how to present image like this

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How do I change aspect ratio in UIImageView?

If you are resizing UIImageView manually, set the content mode to UIViewContentModeScaleAspectFill . If you want to keep content mode UIViewContentModeScaleAspectFit do not resize imageview to 313. Image will adjust maximum possible width and height , keeping it's aspect ratio.

What is Contentmode in Swift?

A flag used to determine how a view lays out its content when its bounds change.

Use an UIImageView with these settings:

imageView.autoresizingMask = (UIViewAutoresizingFlexibleWidth |
                              UIViewAutoresizingFlexibleHeight);

imageView.contentMode = UIViewContentModeScaleAspectFit;