在iOS開發中經常會用到UIlabel來展示一些文字性的內容，但是默認的文字排版會覺得有些擠，為了更美觀也更易于閱讀我們可以通過某些方法將UIlabel的行間距和字間距按照需要調節。

比如一個Label的默認間距效果是這樣：

然后用一個封裝起來的Category來調整這部分文字的行間

[UILabel changeLineSpaceForLabel:cell.describeLabel WithSpace:5.0];

調整后的效果是這樣的：

其中5.0就是我自定義的文字間距。

這是一個UILabel 的Category，他的內部實現是這樣的：

UILabel+ChangeLineSpaceAndWordSpace.h

#import <UIKit/UIKit.h>@interface UILabel (ChangeLineSpaceAndWordSpace)/***  改變行間距*/
+ (void)changeLineSpaceForLabel:(UILabel *)label WithSpace:(float)space;/***  改變字間距*/
+ (void)changeWordSpaceForLabel:(UILabel *)label WithSpace:(float)space;/***  改變行間距和字間距*/
+ (void)changeSpaceForLabel:(UILabel *)label withLineSpace:(float)lineSpace WordSpace:(float)wordSpace;@end

UILabel+ChangeLineSpaceAndWordSpace.m

#import "UILabel+ChangeLineSpaceAndWordSpace.h"@implementation UILabel (ChangeLineSpaceAndWordSpace)+ (void)changeLineSpaceForLabel:(UILabel *)label WithSpace:(float)space {NSString *labelText = label.text;NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:labelText];NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];[paragraphStyle setLineSpacing:space];[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [labelText length])];label.attributedText = attributedString;[label sizeToFit];}+ (void)changeWordSpaceForLabel:(UILabel *)label WithSpace:(float)space {NSString *labelText = label.text;NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:labelText attributes:@{NSKernAttributeName:@(space)}];NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [labelText length])];label.attributedText = attributedString;[label sizeToFit];}+ (void)changeSpaceForLabel:(UILabel *)label withLineSpace:(float)lineSpace WordSpace:(float)wordSpace {NSString *labelText = label.text;NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:labelText attributes:@{NSKernAttributeName:@(wordSpace)}];NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];[paragraphStyle setLineSpacing:lineSpace];[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [labelText length])];label.attributedText = attributedString;[label sizeToFit];}@end

根據內部實現也可以自己靈活運用 不一定用Category的方法。