1.自定义个label

#import <UIKit/UIKit.h>
@interface CustomLabel : UILabel
@property (nonatomic, assign) UIEdgeInsets textInsets; // 控制字体与控件边界的间隙
@end

#import "CustomLabel.h"
@implementation CustomLabel
- (instancetype)init {
    if (self = [super init]) {
        _textInsets = UIEdgeInsetsZero;
    }
    return self;
}
- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        _textInsets = UIEdgeInsetsZero;
    }
    return self;
}
- (void)drawTextInRect:(CGRect)rect {
    [super drawTextInRect:UIEdgeInsetsInsetRect(rect, _textInsets)];
}
@end

2.使用

#import "ViewController.h"
#import "CustomLabel.h"
@interface ViewController (){
    CustomLabel *regulationLabel;//中心抽奖规则lab
}

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    regulationLabel = [[CustomLabel alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width*6/7, self.view.frame.size.height*5/6)];
    NSMutableParagraphStyle *paragStyle = [[NSMutableParagraphStyle alloc]init];
    paragStyle.alignment = NSTextAlignmentLeft;
    paragStyle.headIndent = 1*8.0f+2.0f;//行首缩进
    //    paragStyle.firstLineHeadIndent = 1*8.0f;//首行缩进
    //    paragStyle.lineSpacing = 4.0f;
    NSDictionary *labDic = @{NSParagraphStyleAttributeName:paragStyle,
                             NSFontAttributeName:[UIFont systemFontOfSize:12],
                             NSForegroundColorAttributeName:[UIColor blackColor]};
    NSAttributedString *attrString = [[NSAttributedString alloc]initWithString:[self regulationString] attributes:labDic];
    regulationLabel.backgroundColor = [UIColor redColor];
    regulationLabel.attributedText = attrString;

    regulationLabel.numberOfLines = 0;//
    [regulationLabel sizeToFit]; //自适应大小的方法   标签的大小由字体的大小长度决定
    regulationLabel.center = self.view.center;
    regulationLabel.lineBreakMode = NSLineBreakByCharWrapping; //根据xx进行换行
    regulationLabel.userInteractionEnabled = YES;

    regulationLabel.textInsets = UIEdgeInsetsMake(0, 10, 10, 10);//设置内边距
    [self.view addSubview:regulationLabel];
}
- (NSString *)regulationString{

    NSString *ruleString = @"1.Do any additional setup after loading the view, typically from a nib.Do any additional setup after loading the view, typically from a nib.Do any additional setup after loading the view, typically from a nib.Do any additional setup after loading the view, typically from a nib.Do any additional setup after loading the view, typically from a nib.Do any additional setup after loading the view, typically from a nib.ffffff";
    return ruleString;
}