_promptLabel = [UILabel new]; 
NSString *labelText = @"Talk is cheap\nShow me the code"; 
_promptLabel.text = labelText;
 _promptLabel.numberOfLines = 2; 
_promptLabel.font = [UIFont systemFontOfSize:14];
 NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:labelText]; NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init]; [paragraphStyle setLineSpacing:10]; //调整行间距 
[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [labelText length])]; _promptLabel.attributedText = attributedString; [_promptLabel sizeToFit]; [self.view addSubview:_promptLabel];