NSAttributedString

1. 富文本的简单处理

UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0, 60, CGRectGetWidth(self.view.frame), 60)];
  UILabel *label1 = [[UILabel alloc]initWithFrame:CGRectMake(0, 200, CGRectGetWidth(self.view.frame), 60)];
   [self.view addSubview:label];
   [self.view addSubview:label1];
    
    label.attributedText =
    [[NSAttributedString alloc]initWithString:@"just test"
                                   attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:20],//字体设置
                                                NSForegroundColorAttributeName:[UIColor redColor],//字体颜色
                                                NSBackgroundColorAttributeName:[UIColor greenColor],//背影颜色，默认为nil,透明色
                                                
                                                NSKernAttributeName:@0.2, //字符间距,正值增加，负值减少
                        
                                                NSStrikethroughStyleAttributeName:@1,//删除线，默认为0
                                                NSStrikethroughColorAttributeName:[UIColor orangeColor],//删除线颜色
                                                
                                                //NSUnderlineStyleSingle
                                                //NSUnderlineStyleDouble
                                                NSUnderlineStyleAttributeName:@(NSUnderlineStyleSingle),// 下划线,默认为0
                                                NSUnderlineColorAttributeName:[UIColor blueColor],//下划线颜色
                                                
                                                NSStrokeWidthAttributeName:@3.0,//笔画宽度，负值为填充效果，正值为中空效果
                                                NSStrokeColorAttributeName:[UIColor grayColor],//暂无效果
                                                
                                                NSBaselineOffsetAttributeName:@-3,//基线偏移值
                                                NSObliquenessAttributeName:@0.1,  //字符倾斜值
                                                
                                                NSExpansionAttributeName:@0.5,//文本横向拉伸
                                                                   }];
    NSMutableAttributedString *attributeString = [[NSMutableAttributedString alloc]initWithString:@"just test"];
    [attributeString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0, 2)];
    [attributeString addAttribute:NSStrikethroughStyleAttributeName value:@1 range:NSMakeRange(2, 3)];
    label1.attributedText = attributeString;

2.常用方法的封装

//对字符串部分文本更改颜色
-(NSMutableAttributedString *)changeCorlorWithColor:(UIColor *)color totalString:(NSString *)totalStr subStringArray:(NSArray *)subArray {
    
    NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc] initWithString:totalStr];
    for (NSString *rangeStr in subArray) {
        
        NSRange range = [totalStr rangeOfString:rangeStr options:NSBackwardsSearch];
        [attributedStr addAttribute:NSForegroundColorAttributeName value:color range:range];
    }
    return attributedStr;
}
//更改部分文字字体及颜色
-(NSMutableAttributedString *)changeFontAndColor:(UIFont *)font color:(UIColor *)color TotalString:(NSString *)totalString SubStringArray:(NSArray *)subArray {
    
    NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc] initWithString:totalString];
    for (NSString *rangeStr in subArray) {
        
        NSRange range = [totalString rangeOfString:rangeStr options:NSBackwardsSearch];
        [attributedStr addAttribute:NSForegroundColorAttributeName value:color range:range];
        [attributedStr addAttribute:NSFontAttributeName value:font range:range];
    }
    return attributedStr;
}
//更改字间距
-(NSMutableAttributedString *)changeSpaceWithTotalString:(NSString *)totalString space:(CGFloat)space {
    
    NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc] initWithString:totalString];
    long number = space;
    CFNumberRef num = CFNumberCreate(kCFAllocatorDefault,kCFNumberSInt8Type,&number);
    [attributedStr addAttribute:(id)kCTKernAttributeName value:(__bridge id)num range:NSMakeRange(0,[attributedStr length])];
    CFRelease(num);
    return attributedStr;
}
//更改行间距
-(NSMutableAttributedString *)changeLineSpaceWithTotalString:(NSString *)totalString lineSpace:(CGFloat)lineSpace {
    
    NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc] initWithString:totalString];
    
    NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    [paragraphStyle setLineSpacing:lineSpace];
    [attributedStr addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [totalString length])];
    return attributedStr;
}
//更改字间距与行间距
-(NSMutableAttributedString *)ls_changeLineAndTextSpaceWithTotalString:(NSString *)totalString lineSpace:(CGFloat)lineSpace textSpace:(CGFloat)textSpace {
    
    NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc] initWithString:totalString];
    NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    [paragraphStyle setLineSpacing:lineSpace];
    [attributedStr addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [totalString length])];
    long number = textSpace;
    CFNumberRef num = CFNumberCreate(kCFAllocatorDefault,kCFNumberSInt8Type,&number);
    [attributedStr addAttribute:(id)kCTKernAttributeName value:(__bridge id)num range:NSMakeRange(0,[attributedStr length])];
    CFRelease(num);
    return attributedStr;
}