iOS字符串的截取，拼接，字体颜色改变

• 改变字符串的颜色

UILabel* noteLabel = [[UILabel alloc] init];
noteLabel.frame = CGRectMake(60, 100, 200, 100);
noteLabel.textColor = [UIColor blackColor];
noteLabel.numberOfLines = 2;
NSMutableAttributedString *noteStr = [[NSMutableAttributedString alloc] initWithString:@"点击注册按钮,即表示您已同意隐私条款和服务协议"];
NSRange redRange = NSMakeRange([[noteStr string] rangeOfString:@"注册"].location, [[noteStr string] rangeOfString:@"注册"].length);
[noteStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:redRange];
NSRange redRangeTwo = NSMakeRange([[noteStr string] rangeOfString:@"同意"].location, [[noteStr string] rangeOfString:@"同意"].length);
[noteStr addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:redRangeTwo];
[noteLabel setAttributedText:noteStr];
[noteLabel sizeToFit];
[self.view addSubview:noteLabel];

• 截取字符串

NSString*string =@"sdfsfsfsAdfsdf";
string = [string substringToIndex:7];//截取下标7之后的字符串
NSLog(@"截取的值为：%@",string);
[string substringFromIndex:2];//截取下标2之前的字符串
NSLog(@"截取的值为：%@",string);

• 匹配字符串

NSString*string =@"sdfsfsfsAdfsdf";
NSRangerange = [stringrangeOfString:@"f"];//匹配得到的下标
NSLog(@"rang:%@",NSStringFromRange(range));
string = [string substringWithRange:range];//截取范围类的字符串
NSLog(@"截取的值为：%@",string);

• 分隔字符串

NSString*string =@"sdfsfsfsAdfsdf";
NSArray *array = [string componentsSeparatedByString:@"A"]; //从字符A中分隔成2个元素的数组
NSLog(@"array:%@",array); //结果是adfsfsfs和dfsdf

• 字符串分割

NSString *str1=@"1=2=3=4";//
NSArray *arry=[str1 componentsSeparatedByString:@"="];
NSLog(@"%@",arry);

https://blog.csdn.net/iCandyss/article/details/50298877