UILabel的每行都会缩进

- (void)viewDidLoad {

[superviewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

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

contentLabel.backgroundColor= [UIColorredColor];

contentLabel.numberOfLines=0;

[self.viewaddSubview: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 = [[NSMutableParagraphStylealloc]init];

paraStyle01.alignment=NSTextAlignmentLeft;//对齐

/*

这里这里

*/

paraStyle01.headIndent=30.0f;//行首缩进 (0.0f是首行缩进)

//参数：（字体大小17号字乘以2，34f即首行空出两个字符）

CGFloatemptylen = 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}];

contentLabel.attributedText= attrText;

}