NSMutableAttributedString的简单用法

 1 @interface NSMutableAttributedString : NSAttributedString
 2 
 3 - (void)replaceCharactersInRange:(NSRange)range withString:(NSString *)str;
 4 - (void)setAttributes:(nullable NSDictionary<NSString *, id> *)attrs range:(NSRange)range;
 5 
 6 @end
 7 
 8 @interface NSMutableAttributedString (NSExtendedMutableAttributedString)
 9 
10 @property (readonly, retain) NSMutableString *mutableString;
11 
12 - (void)addAttribute:(NSString *)name value:(id)value range:(NSRange)range;
13 - (void)addAttributes:(NSDictionary<NSString *, id> *)attrs range:(NSRange)range;
14 - (void)removeAttribute:(NSString *)name range:(NSRange)range;
15 
16 - (void)replaceCharactersInRange:(NSRange)range withAttributedString:(NSAttributedString *)attrString;
17 - (void)insertAttributedString:(NSAttributedString *)attrString atIndex:(NSUInteger)loc;
18 - (void)appendAttributedString:(NSAttributedString *)attrString;
19 - (void)deleteCharactersInRange:(NSRange)range;
20 - (void)setAttributedString:(NSAttributedString *)attrString;
21 
22 - (void)beginEditing;
23 - (void)endEditing;

 1     NSString *string = @"这是一个完整的句子吧";
 2     
 3     UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(50, 70, 250, 50)];
 4         [self.view addSubview:label];
 5     
 6     //初始化一个attriburitedString对象
 7     _attributeString = [[NSMutableAttributedString alloc] initWithString:string];
 8     
 9     //给这个属性添加一个属性前3个字符的背景颜色
10     NSRange orRange = NSMakeRange(0, 3);
11     [_attributeString addAttribute:NSBackgroundColorAttributeName value:[UIColor yellowColor] range:orRange];
12     
13     
14     //更换string的部分字符串
15     NSRange reRange = NSMakeRange(3, 2);
16     [_attributeString replaceCharactersInRange:reRange withString:@"qinguangyi"];
17     
18     //添加多个属性
19     NSRange seRange = NSMakeRange(8, 5);
20     [_attributeString setAttributes:@{
21                                       NSForegroundColorAttributeName:
22                                           [UIColor redColor],
23                                       NSBackgroundColorAttributeName:
24                                           [UIColor blueColor],
25                                       } range:seRange];
26     
27     NSMutableAttributedString *newAttributeString = [[NSMutableAttributedString alloc] initWithString:@"NEW"];
28     
29     /* 其他属性自己尝试
30     [_attributeString replaceCharactersInRange:NSMakeRange(0, 3) withString:@"123"];
31     [_attributeString insertAttributedString:newAttributeString atIndex:0];
32     [_attributeString deleteCharactersInRange:NSMakeRange(0, 3)];
33     [_attributeString appendAttributedString:newAttributeString];
34     
35     [_attributeString setAttributedString:newAttributeString];
36      */
37     
38     
39     
40     //最简单的给label赋值的方法打点调用attributedText
41     label.attributedText = _attributeString;