ios Label高度自适应

来源：互联网发布：文华财经交易软件编辑：程序博客网时间：2024/04/30 07:04

首先来看单行文本的问题：对于单行文本来说，计算CGSize就比较简单了，这里直接上代码了，如下：

NSString *content = @"欢迎来到北京";

CGSize size =[content sizeWithAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:14]}];

最后来看多行文本的显示：

首先UILabel的numberOfLines设置为0，其次通过- (CGRect)boundingRectWithSize:(CGSize)size options:(NSStringDrawingOptions)options attributes:(NSDictionary *)attributes context:(NSStringDrawingContext *)context方法来计算CGSize，具体代码如下：

    UILabel *titleLabel = [UILabel new];
    titleLabel.font = [UIFont systemFontOfSize:14];
    NSString *string= @"啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦啦";
    titleLabel.text = string;
    titleLabel.numberOfLines = 0;//多行显示，计算高度
    titleLabel.textColor = [UIColor lightGrayColor];
    CGSize titleSize = [string boundingRectWithSize:CGSizeMake(指定宽度, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:14]} context:nil].size;
    titleLabel.size = titleSize;


    [self.view addSubview:titleLabel];

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