[UIScreen mainScreen]. bounds. size. height.

[UIScreen mainScreen]. bounds. size. height.
I. Problems

[UIScreen mainScreen]. bounds. size. height values are always fixed and will not be changed based on iPhone phones of different screen sizes.

Ii. Cause

This is because, after the Apple system detects default-568h@2x.png, it will call the screen size function.
Therefore, for ios development, you must add this image.

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