IOS开发调整UILabel的行间距

CGFloat heih = 20;

NSString * cLabelString = @"这是测试UILabel行间距的text。这是测试UILabel行间距的text。n 这是测试UILabel行间距的text。n 这是测试UILabel行间距的text。这是测试UILabel行间距的text。这是测试UILabel行间距的text。这是测试UILabel行间距的text。";
UILabel * cLabel = [[UILabel alloc]initWithFrame:CGRectMake(20, heih, 280, 200)];
cLabel.numberOfLines = 0;
cLabel.font = [UIFont fontWithName:fontName size:16];
cLabel.textColor = [UIColor grayColor];

NSMutableAttributedString * attributedString1 = [[NSMutableAttributedString alloc] initWithString:cLabelString];
NSMutableParagraphStyle * paragraphStyle1 = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle1 setLineSpacing:8];
[attributedString1 addAttribute:NSParagraphStyleAttributeName value:paragraphStyle1 range:NSMakeRange(0, [cLabelString length])];
[cLabel setAttributedText:attributedString1];
[cLabel sizeToFit];
[self.view addSubview:cLabel];