knowledge-kit/Chapter1 - iOS/1.28.md

# UILabel 给关键字模糊匹配并高亮

> 有些情况就是需要查找某个字符串并高亮，但有些需求就是需要全局模糊查找，找到符合的字符串并高亮。造了个小轮子

###效果图
![模糊匹配文字并高亮
](https://raw.githubusercontent.com/FantasticLBP/BlogDemos/master/image/QQ20180610-235439%402x.png)

```
#pragma mark -- 设置在一个文本中所有特殊字符的特殊颜色
+ (NSMutableAttributedString *)setAllText:(NSString *)allStr andSpcifiStr:(NSString *)keyWords withColor:(UIColor *)color specifiStrFont:(UIFont *)font{
    NSMutableAttributedString *mutableAttributedStr = [[NSMutableAttributedString alloc] initWithString:allStr];
    if (color == nil) {
        color = [UIColor redColor];
    }
    if (font == nil) {
        font = [UIFont systemFontOfSize:17];
    }
    
    
    for (NSInteger j=0; j<=keyWords.length-1; j++) {
        
        NSRange searchRange = NSMakeRange(0, [allStr length]);
        NSRange range;
        NSString *singleStr = [keyWords substringWithRange:NSMakeRange(j, 1)];
        while
            ((range = [allStr rangeOfString:singleStr options:NSLiteralSearch range:searchRange]).location != NSNotFound) {
                //改变多次搜索时searchRange的位置
                searchRange = NSMakeRange(NSMaxRange(range), [allStr length] - NSMaxRange(range));
                //设置富文本
                [mutableAttributedStr addAttribute:NSForegroundColorAttributeName value:color range:range];
                [mutableAttributedStr addAttribute:NSFontAttributeName value:font range:range];
            }
    }
    return mutableAttributedStr;
}
```

[源码地址](https://github.com/FantasticLBP/BlogDemos/tree/master/LBPAttributedStringTools)