根据文字算出文字所占区域大小

/**

* 根据文字算出文字所占区域大小

*

* @param text
文字内容

* @param font
字体

* @param maxSize
最大尺寸

*

* @return
实际尺寸

*/
- (CGSize)labelAutoCalculateRectWith:(NSString*)text Font:(UIFont*)font
MaxSize:(CGSize)maxSize
{

NSMutableParagraphStyle* paragraphStyle = [[NSMutableParagraphStyle
alloc]init];

paragraphStyle.lineBreakMode=NSLineBreakByWordWrapping;

NSDictionary* attributes =@{NSFontAttributeName:font,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;
}