NSString*_test =@"首行缩进根据字体大小自动调整 间隔可自定根据需求随意改变。。。。。。。";
NSMutableParagraphStyle*paraStyle01= [[NSMutableParagraphStylealloc]init];
paraStyle01.alignment= NSTextAlignmentLeft;//对齐
paraStyle01.headIndent=0.0f;//行首缩进
//参数：（字体大小17号字乘以2，34f即首行空出两个字符）
CGFloat emptylen =self.contentLabel.font.pointSize*2;
paraStyle01.firstLineHeadIndent= emptylen;//首行缩进
paraStyle01.tailIndent=0.0f;//行尾缩进
paraStyle01.lineSpacing=2.0f;//行间距
NSAttributedString*attrText = [[NSAttributedStringalloc]initWithString:_testattributes:@{NSParagraphStyleAttributeName:paraStyle01}];
self.contentLabel.attributedText= attrText;
