swift - UIButton's textLabel not being clipped -

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i have uibutton,and set text this:

let mybutton ... mybutton.textlabel?.text = "abcdefghijklmn"

but when run ,the text clipped. how uibutton auto resize fit inner text.

here screenshot.

enter image description here

what want this:

abcdefghijklmn

option a: mybutton.sizetofit()

option b: use layout constraints don't constrict label's width


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