Cocoa - iOS -Does updating the text property of a UILabel require setNeedsDisplay?

Question

I am a newbie and I have a iOS project where I am setting the text property of a UILabel field.

self.nameLabel.text = @"abcd";

Question

• Do I need to invoke setNeedsDisplayInRect for the label for the new text value to be displayed ?

My understanding based on some testing:

• Without invoking setNeedsDisplayInRect, the the label's text was updated,
• but I want to know if it was a coincidence or is gauranteed that the the label will display the new value without explicitly invoking setNeedsDisplay

Thanks