ios UILable 首行缩进，行首缩进

UILabel* contentLabel = [[UILabel alloc]initWithFrame:CGRectMake(20, 100, 200, 500)];

contentLabel.backgroundColor = [UIColor redColor];

contentLabel.numberOfLines = 0;

[self.view addSubview:contentLabel];

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 = [[NSMutableParagraphStyle alloc] init];

paraStyle01.alignment = NSTextAlignmentLeft;  //对齐

/*

这里这里

*/

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 = 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 = [[NSAttributedString alloc] initWithString:_test attributes:@{NSParagraphStyleAttributeName:paraStyle01}];

contentLabel.attributedText = attrText;