在UILabel内计算内容的大小

//UILabel+LM.h

////UILabel+LM.h//Test////Created by 李蒙 on 14-3-21.//Copyright (c) 2014年 datangcloud. All rights reserved.//#import<UIKit/UIKit.h>@interfaceUILabel (LM)-(CGSize)contentSize;@end

//UILabel+LM.m

////UILabel+LM.m//Test////Created by 李蒙 on 14-3-21.//Copyright (c) 2014年 datangcloud. All rights reserved.//#import"UILabel+LM.h"@implementationUILabel (LM)-(CGSize)contentSize

{

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

paragraphStyle.lineBreakMode=self.lineBreakMode;

paragraphStyle.alignment=self.textAlignment;

NSDictionary* attributes =@{NSFontAttributeName : self.font,

NSParagraphStyleAttributeName : paragraphStyle};

CGSize contentSize=[self.text boundingRectWithSize:self.frame.size

options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading)

attributes:attributes

context:nil].size;returncontentSize;

}@end