UILabel实现文本自适应方法

- (void)initUserInterface

{

    UILabel *label = [[UILabel alloc]init];

    label.numberOfLines = 0; // 需要把显示行数设置成无限制

    label.font = [UIFont systemFontOfSize:15];

    label.textAlignment = NSTextAlignmentCenter;

    label.text = @"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";

    CGSize size =  [self sizeWithString:label.text font:label.font];

    label.bounds = CGRectMake(0, 0, size.width, size.height);

    label.center = self.view.center;

    [self.view addSubview:label];

     

}

// 定义成方法方便多个label调用 增加代码的复用性

- (CGSize)sizeWithString:(NSString *)string font:(UIFont *)font

{

    CGRect rect = [string boundingRectWithSize:CGSizeMake(320, 8000)//限制最大的宽度和高度

                                       options:NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesFontLeading  |NSStringDrawingUsesLineFragmentOrigin//采用换行模式

                                    attributes:@{NSFontAttributeName: font}//传人的字体字典

                                       context:nil];

     

    return rect.size;

}