在iOS開發(fā)中經(jīng)常會用到UIlabel來展示一些文字性的內(nèi)容直秆，但是默認的文字排版會覺得有些擠芹扭，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(diào)節(jié)御板。
比如一個Label的默認間距效果是這樣：
1749044-f66980df42aeebca.jpg
然后用一個封裝起來的Category來調(diào)整這部分文字的行間
[UILabel changeLineSpaceForLabel:cell.describeLabel WithSpace:5.0];
調(diào)整后的效果是這樣的：
1749044-384c81bf5a81633d.jpg
其中5.0就是我自定義的文字間距。
這是一個UILabel 的Category贯吓，他的內(nèi)部實現(xiàn)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(jù)內(nèi)部實現(xiàn)也可以自己靈活運用 不一定用Category的方法鳞溉。
