NSMutableAttributedString可变字符串使用

//原始数据字符串
NSString *string = @"我是好人我是好人我是个好人额鹅鹅鹅鹅鹅鹅饿哇哇哇哇哇哇哇";

// 创建可变属性化字符串
NSMutableAttributedString *attrString = [[NSMutableAttributedString alloc] initWithString:string];

//改变字符串当中从第18位置向后的10位数的字体
UIFont *smallFont = [UIFont systemFontOfSize:30];
[attrString addAttribute:NSFontAttributeName
value:smallFont
range:NSMakeRange(5, 10)];

//改变字符串当中第一个“1”的颜色
UIColor *rcolor = [UIColor redColor];
[attrString addAttribute:NSForegroundColorAttributeName
value:rcolor
range:[string rangeOfString:@"是"]];

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(20, 44, 320, 200)];
label.numberOfLines = 0;
[self.view addSubview:label];
label.attributedText = attrString;