How to remove the extra padding below an one line UILabel

Question

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.

Answer 1

// baselineOffset, It was totally hit and miss Hope to help you

[attributedString addAttribute:NSBaselineOffsetAttributeName value:@(baselineOffset) range:range];

Answer 2

use sizeToFit on a label to the size required by the text

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[yourlabelName sizeToFit];

any other padding would be from the font, the label itself doesn't apply any other padding