字符串的截取，拼接，字体颜色改变

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];

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);

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);

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

NSString *str1=@"1=2=3=4";//

NSArray *arry=[str1 componentsSeparatedByString:@"="];

NSLog(@"%@",arry);