iOS 根据字符串长度计算label的尺寸

//计算字符串高度
- (CGSize)labelAutoCalculateRectWith:(NSString*)text FontSize:(CGFloat)fontSize MaxSize:(CGSize)maxSize

{
    
    NSMutableParagraphStyle* paragraphStyle = [[NSMutableParagraphStyle alloc]init];
    
    paragraphStyle.lineBreakMode=NSLineBreakByWordWrapping;
    
    NSDictionary* attributes =@{NSFontAttributeName:[UIFont systemFontOfSize:fontSize],NSParagraphStyleAttributeName:paragraphStyle.copy};
    
    CGSize labelSize = [text boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading|NSStringDrawingTruncatesLastVisibleLine attributes:attributes context:nil].size;
    
    labelSize.height=ceil(labelSize.height);
    
    labelSize.width=ceil(labelSize.width);
    
    return labelSize;
    
}

示例：

[self labelAutoCalculateRectWith:str FontSize:14 MaxSize:CGSizeMake(270, 2000)];

iOS 根据字符串长度计算label的尺寸

原文：http://www.cnblogs.com/huangzs/p/4541067.html