问题
I wanna to use a UILabel to show some words which is sent from Server，these words which i set them as NSMutableAttributeString sometimes only occupy one line (only in this case, the problem comes).
I intend to get the exact space which the label would take up,but when the label only takes up one line,and very important — i set the NSMutableAttributeString with lineSpacing (10px,NSMutableParagraphStyle),but this，unexpectedly， would also works when even there is only one line here — the problem shows up as some extra padding below the word (i test with some chinese word,but attention: if the words takes up more than one line, there is no problem). and the weird story is — if the word is purely english or Arabic numerals，the extra padding won't exist)
the following pics may shows the problem a little clearly:
1.English words -- oneline (no extra padding)[test words:today 0987776]
2.Chinese words -- oneline (some extra padding)[test words:今天天气好啊!]
Hope someone would help . Thx a lot.
回答1:
use sizeToFit on a label to the size required by the text
[yourlabelName sizeToFit];
any other padding would be from the font, the label itself doesn't apply any other padding
回答2:
// baselineOffset, It was totally hit and miss Hope to help you
[attributedString addAttribute:NSBaselineOffsetAttributeName value:@(baselineOffset) range:range];
来源：https://stackoverflow.com/questions/33969276/how-to-remove-the-extra-padding-below-an-one-line-uilabel