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)];
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