iphone：sizeWithFont方法不会从字符串中识别'\' [英] iphone : sizeWithFont method does not identify the '\n' from string

问题描述

  NSString * str = @这是\\\
 \\\
 \\\
; 
 CGSize size = [str sizeWithFont：[UIFont fontWithName：@Verdanasize：12.5] forWidth：300 
 lineBreakMode：UILineBreakModeWordWrap]; 
 NSLog（@Height：％f Width：％f，size.height，size.width）; 
  

但是，id并不考虑字符串中的\\\
个字符来更改行。当我在标签上显示此字符串并将其numberOfLines属性设置为大约4或5时，标签会考虑\\\
并转到下一行。考虑到字符串中的\\\
，我如何计算lable的高度。请帮助我。

谢谢!!!

解决方案

这个：

  NSString * str = @这是\\\
 \\\\\ 
 CGSize size = [str sizeWithFont：[UIFont fontWithName：@Verdanasize：12.5] constrainedToSize：CGSizeMake（300.0f，999999.0f）]; 
 NSLog（@Height：％f Width：％f，size.height，size.width）; 
  

这给我身高：48.000000宽度：40.000000 ，但请务必将标签中的行号设置为 0 。

I am using below code to calculate the size for the label for a string.

    NSString * str = @"It's \n that \n don't \n";
    CGSize size = [str sizeWithFont:[UIFont fontWithName:@"Verdana" size:12.5] forWidth:300  
     lineBreakMode:UILineBreakModeWordWrap];
    NSLog(@"Height : %f   Width : %f ",size.height,size.width);

But id does not consider \n characters from the string to change the line. When I display this string on a label and set it numberOfLines property to some 4 or 5 , label does consider the \n and go to the next line. How can I calculate the height for the lable considering the \n's from the string. Please help me .

Thank You !!!

解决方案

Try this:

NSString * str = @"It's \n that \n don't \n";
CGSize size = [str sizeWithFont:[UIFont fontWithName:@"Verdana" size:12.5] constrainedToSize:CGSizeMake(300.0f, 999999.0f)];
NSLog(@"Height : %f   Width : %f ",size.height,size.width);

This give me Height : 48.000000 Width : 40.000000, but be sure to set the number of line in the label to 0.

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