- (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=@"首行縮進根據(jù)字體大小自動調(diào)整間隔可自定根據(jù)需求隨意改變。。。。。。。";

NSMutableParagraphStyle*paraStyle01 = [[NSMutableParagraphStylealloc]init];

paraStyle01.alignment=NSTextAlignmentLeft;//對齊

/*

這里這里

*/

paraStyle01.headIndent=30.0f;//行首縮進 (0.0f是首行縮進)

//參數(shù)：（字體大小17號字乘以2，34f即首行空出兩個字符）

CGFloatemptylen = contentLabel.font.pointSize*2;

paraStyle01.firstLineHeadIndent= emptylen;//首行縮進

paraStyle01.tailIndent=0.0f;//行尾縮進

paraStyle01.lineSpacing=2.0f;//行間距

NSAttributedString*attrText = [[NSAttributedStringalloc]initWithString:_testattributes:@{NSParagraphStyleAttributeName:paraStyle01}];

contentLabel.attributedText= attrText;

}