在UILabel内计算内容的大小

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

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