如何动态计算UILabel高度？ [英] How to calculate UILabel height dynamically?

问题描述

我想从给定文本中动态计算UILabel的行数和高度。

解决方案

试试这个

  // UILabel * myLabel; 
 
 CGSize labelSize = [myLabel.text sizeWithFont：myLabel.font 
 constrainedToSize：myLabel.frame.size 
 lineBreakMode：NSLineBreakByWordWrapping]; 
 
 CGFloat labelHeight = labelSize.height; 
 
 
 int lines = [myLabel.text sizeWithFont：myLabel.font 
 constrainedToSize：myLabel.frame.size 
 lineBreakMode：NSLineBreakByWordWrapping] .height / 16; 
 //'16'是字体大小
  

或

  int lines = labelHeight / 16; 
 
 NSLog（@行数：％i \ n \ n，行）; 
  

或

  int lines = [myLabel.text sizeWithFont：myLabel.font 
 constrainedToSize：myLabel.frame.size 
 lineBreakMode：UILineBreakModeWordWrap] .height /myLabel.font.pointSize; //从字体中获取字体大小
  

通过使用类别，只需创建名为

UILabel + UILabelDynamicHeight.h

UILabel + UILabelDynamicHeight.m

高度计算不再紧张。请查看以下实施方案。

iOS7及更新版的更新上图，iOS 7以下：动态计算UILabel高度

  #define SYSTEM_VERSION_EQUAL_TO（v）（[[[UIDevice currentDevice] systemVersion] compare：v options：NSNumericSearch] == NSOrderedSame）
 #define SYSTEM_VERSION_GREATER_THAN（v）（[[[[UIDevice currentDevice] systemVersion] compare：v options：NSNumericSearch] == NSOrderedDescending）
＃定义SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO（v）（[[[[UIDevice currentDevice] systemVersion] compare：v options：NSNumericSearch]！= NSOrderedAscending）
 #define SYSTEM_VERSION_LESS_THAN（v）（[[[[UIDevice currentDevice] systemVersion] compare：v options：NSNumericSearch ] == NSOrderedAscending）
 #define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO（v）（[[[[UIDevice currentDevice] systemVersion] compare：v options：NSNumericSearch]！= NSOrderedDescending）
 #define iOS7_0 @7.0
  

UILabel + UILabelDynamicHeight.h

  #import< UIKit / UIKit.h> 
 @interface UILabel（UILabelDynamicHeight）
 
 #pragma mark  - 计算多行标签的大小
 / * =============== ================================================== === * / 
 
 / *计算多行标签的大小* / 
 
 / * =============== ================================================== === * / 
 / ** 
 *返回标签的大小
 * 
 * @param aLabel用于计算高度
 * 
 * @return标签尺寸
 * / 
  - （CGSize）sizeOfMultiLineLabel; 
 
 @end 
  

UILabel + UILabelDynamicHeight.m

  #importUILabel + UILabelDynamicHeight.h
 @implementation UILabel（UILabelDynamicHeight）
 
 
 #pragma mark  - 计算多行标签的大小，边界，框架
 / * ====================== ============================================== * / 
 
 / *计算多行标签的大小，边界，框架* / 
 
 / * ================== ================================================== * / 
 / ** 
 *返回标签的大小
 * 
 * @param aLabel用于计算高度
 * 
 *标签的@return大小$ ​​b $ b * / 
  - （CGSize）sizeOfMultiLineLabel {
 
 //标签文本
 NSString * aLabelTextString = [self text]; 
 
 //标签字体
 UIFont * aLabelFont = [self font]; 
 
 //标签的宽度
 CGFloat aLabelSizeWidth = self.frame.size.width; 
 
 
 if（SYSTEM_VERSION_LESS_THAN（iOS7_0））{
 // version< 7.0 
 
 return [aLabelTextString sizeWithFont：aLabelFont 
 constrainedToSize：CGSizeMake（aLabelSizeWidth，MAXFLOAT）
 lineBreakMode：NSLineBreakByWordWrapping]; 
} 
 else if（SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO（iOS7_0））{
 //版本> = 7.0 
 
 //返回标签的计算大小
 return [aLabelTextString boundingRectWithSize：CGSizeMake（aLabelSizeWidth，MAXFLOAT）
 options：NSStringDrawingUsesLineFragmentOrigin 
 attributes：@ {
 NSFontAttributeName：aLabelFont 
} 
 context：nil] .size; 
 
} 
 
 return [self bounds] .size; 
 
} 
 @end 
  

I want to calculate number of lines and height of UILabel dynamically from given text for same.

解决方案

Try this

// UILabel *myLabel;

CGSize labelSize = [myLabel.text sizeWithFont:myLabel.font 
                            constrainedToSize:myLabel.frame.size 
                                lineBreakMode:NSLineBreakByWordWrapping];

CGFloat labelHeight = labelSize.height;


int lines = [myLabel.text sizeWithFont:myLabel.font 
                     constrainedToSize:myLabel.frame.size 
                         lineBreakMode:NSLineBreakByWordWrapping].height/16; 
             // '16' is font size

or

int lines = labelHeight/16;

NSLog(@"lines count : %i \n\n",lines);  

or

int lines = [myLabel.text sizeWithFont:myLabel.font 
                     constrainedToSize:myLabel.frame.size 
                         lineBreakMode:UILineBreakModeWordWrap].height /myLabel.font.pointSize; //fetching font size from font

By Using Categories, Just Create the category class named as

UILabel+UILabelDynamicHeight.h

UILabel+UILabelDynamicHeight.m

No more tension about the height calculation. Please review the below implementation.

Updates for iOS7 & Above,iOS 7 below : Dynamically calculate the UILabel height

#define SYSTEM_VERSION_EQUAL_TO(v)                  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)
#define SYSTEM_VERSION_GREATER_THAN(v)              ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v)                 ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v)     ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)
#define iOS7_0 @"7.0"

UILabel+UILabelDynamicHeight.h

#import <UIKit/UIKit.h>
@interface UILabel (UILabelDynamicHeight)

#pragma mark - Calculate the size the Multi line Label
/*====================================================================*/

    /* Calculate the size of the Multi line Label */

/*====================================================================*/
/**
 *  Returns the size of the Label
 *
 *  @param aLabel To be used to calculte the height
 *
 *  @return size of the Label
 */
 -(CGSize)sizeOfMultiLineLabel;

@end

UILabel+UILabelDynamicHeight.m

#import "UILabel+UILabelDynamicHeight.h"
@implementation UILabel (UILabelDynamicHeight)


#pragma mark - Calculate the size,bounds,frame of the Multi line Label
/*====================================================================*/

/* Calculate the size,bounds,frame of the Multi line Label */

/*====================================================================*/
/**
 *  Returns the size of the Label
 *
 *  @param aLabel To be used to calculte the height
 *
 *  @return size of the Label
 */
-(CGSize)sizeOfMultiLineLabel{

    //Label text
    NSString *aLabelTextString = [self text];

    //Label font
    UIFont *aLabelFont = [self font];

    //Width of the Label
    CGFloat aLabelSizeWidth = self.frame.size.width;


    if (SYSTEM_VERSION_LESS_THAN(iOS7_0)) {
        //version < 7.0

        return [aLabelTextString sizeWithFont:aLabelFont
                            constrainedToSize:CGSizeMake(aLabelSizeWidth, MAXFLOAT)
                                lineBreakMode:NSLineBreakByWordWrapping];
    }
    else if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(iOS7_0)) {
        //version >= 7.0

        //Return the calculated size of the Label
        return [aLabelTextString boundingRectWithSize:CGSizeMake(aLabelSizeWidth, MAXFLOAT)
                                              options:NSStringDrawingUsesLineFragmentOrigin
                                           attributes:@{
                                                        NSFontAttributeName : aLabelFont
                                                        }
                                              context:nil].size;

    }

    return [self bounds].size;

}
@end

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