解决方法
我发现这个帖子在Stackoverflow上使用归因字符串的上标造型文本：
NSAttributedString superscript styling
所以使用这个,我搞砸了这个演示：
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view,typically from a nib.
UIFont *font = [UIFont fontWithName:@"Helvetica" size:20];
UILabel *textBlock1 = [[UILabel alloc] initWithFrame:CGRectMake(0,self.view.bounds.size.width,self.view.bounds.size.height / 2.0)];
textBlock1.backgroundColor = [UIColor colorWithRed:0.9 green:0.9 blue:0.9 alpha:1.0];
textBlock1.textAlignment = NSTextAlignmentCenter;
textBlock1.font = font;
textBlock1.text = @"57%";
UILabel *textBlock2 = [[UILabel alloc] initWithFrame:CGRectMake(0,self.view.bounds.size.height / 2.0,self.view.bounds.size.height / 2.0)];
textBlock2.backgroundColor = [UIColor colorWithRed:0.9 green:0.9 blue:0.9 alpha:1.0];
textBlock2.textAlignment = NSTextAlignmentCenter;
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:@"57%"
attributes:@{NSFontAttributeName: font}];
[attributedString setAttributes:@{NSFontAttributeName : [UIFont fontWithName:@"Helvetica" size:10],NSBaselineOffsetAttributeName : @10} range:NSMakeRange(2,1)];
textBlock2.attributedText = attributedString;
[self.view addSubview:textBlock1];
[self.view addSubview:textBlock2];
}
结果：
