使用NSMutableParagraphStyle實現(xiàn)label文字首尾的縮進

    NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStyle alloc] init];
    paraStyle.alignment = NSTextAlignmentLeft;//對齊
    paraStyle.headIndent = 0.0f;//行首縮進
    //字體大小號字乘以2 即首行空出兩個字符
    CGFloat emptylen = 15 * 2;
    paraStyle.firstLineHeadIndent = emptylen;//首行縮進
    paraStyle.tailIndent = 100.0f;//行尾縮進
    paraStyle.lineSpacing = 2.0f;//行間距
    NSAttributedString *attrText = [[NSAttributedString alloc] initWithString:model.descr attributes:@{NSParagraphStyleAttributeName:paraStyle}];
    _introduceLabel.attributedText = attrText;

首行縮進效果