问题
Is there any way to have a label wordwrap text as needed? I have the line breaks set to word wrap and the label is tall enough for two lines, but it appears that it will only wrap on line breaks. Do I have to add line breaks to make it wrap properly? I just want it to wrap if it can't fit it in horizontally.
回答1:
If you set numberOfLines to 0 (and the label to word wrap), the label will automatically wrap and use as many of lines as needed.
If you're editing a UILabel in IB, you can enter multiple lines of text by pressing option+return to get a line break - return alone will finish editing.
回答2:
UILabel has a property lineBreakMode that you can set as per your requirement.
回答3:
In Swift you would do it like this:
label.lineBreakMode = NSLineBreakMode.ByWordWrapping
label.numberOfLines = 0
(Note that the way the lineBreakMode constant works is different to in ObjC)
回答4:
Xcode 10, Swift 4
Wrapping the Text for a label can also be done on Storyboard by selecting the Label, and using Attributes Inspector.
Lines = 0 Linebreak = Word Wrap
来源：https://stackoverflow.com/questions/1121358/uilabel-wordwrap-text