在iOS开发中经常会用到UIlabel来展示一些文字性的内容,但是默认的文字排版会觉得有些挤,为了更美观也更易于阅读我们可以通过某些方法将UIlabel的行间距和字间距按照需要调节。
比如一个Label的默认间距效果是这样:
然后用一个封装起来的Category来调整这部分文字的行间
[UILabel changeLineSpaceForLabel:cell.describeLabel WithSpace:5.0];
调整后的效果是这样的:
其中5.0就是我自定义的文字间距。
这是一个UILabel 的Category,他的内部实现是这样的:
UILabel+ChangeLineSpaceAndWordSpace.h
#import <UIKit/UIKit.h>
@interface UILabel (ChangeLineSpaceAndWordSpace)
/**
* 改变行间距
*/
+ (void)changeLineSpaceForLabel:(UILabel *)label WithSpace:(float)space;
/**
* 改变字间距
*/
+ (void)changeWordSpaceForLabel:(UILabel *)label WithSpace:(float)space;
/**
* 改变行间距和字间距
*/
+ (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
根据内部实现也可以自己灵活运用 不一定用Category的方法。