NSMutableAttributedString* promiseLabelText= [[NSMutableAttributedString alloc]initWithString:@"****健康購平臺賣家銷售并發貨的商品，由平臺提供發票和相應的售后服務。請您放心購買！"];
NSMutableParagraphStyle*style = [[NSMutableParagraphStyle ?alloc]init];
style.headIndent=0.0f;
style.firstLineHeadIndent=12*2;//首行縮進(參數應為字體字號*2)
[promiseLabelText ? addAttribute:NSParagraphStyleAttributeName ? ?value:style ?range:NSMakeRange(0, promiseLabelText.length)];
self.promiseLabel.attributedText= promiseLabelText;
