UILabel *lbl = [[UILabel alloc]initWithFrame:CGRectMake(10, 100, 200, 40)];
NSString *infoString=@"X2 and H20 A? B? C*";
NSMutableAttributedString *attString=[[NSMutableAttributedString alloc] initWithString:infoString];
[attString addAttribute:(NSString *)kCTSuperscriptAttributeName value:@1 range:NSMakeRange(1, 1)];
[attString addAttribute:(NSString *)kCTSuperscriptAttributeName value:@-1 range:NSMakeRange(8, 1)];
[attString addAttribute:(NSString *)kCTSuperscriptAttributeName value:@1 range:NSMakeRange(12, 1)];
[attString addAttribute:(NSString *)kCTSuperscriptAttributeName value:@1 range:NSMakeRange(15, 1)];
[attString addAttribute:(NSString *)kCTSuperscriptAttributeName value:@1 range:NSMakeRange(18, 1)];
lbl.attributedText = attString;
[self.view addSubview:lbl];
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原文鏈接：https://blog.csdn.net/yueyansheng2/article/details/15506007
