iOS -- 设置label的自适应

- (void)AutoLabel {

    //准备工作

    self.font = [UIFont systemFontOfSize:];

    self.textColor = [UIColor whiteColor];

    self.layer.cornerRadius = ;

    self.layer.masksToBounds = YES;

    self.numberOfLines = ;//根据最大行数需求来设置

    self.lineBreakMode = NSLineBreakByTruncatingTail;

    CGSize maximumLabelSize = CGSizeMake(, );//labelsize的最大值

    //关键语句

    CGSize expectSize = [self sizeThatFits:maximumLabelSize];

    //别忘了把frame给回label，如果用xib加了约束的话可以只改一个约束的值

    self.frame = CGRectMake(, , expectSize.width, expectSize.height);

}