用UILabel文字加下划线 [英] Underline UILabel text

问题描述

我有 UILabel 其字符串是在运行时设置的。 UILabel 中的文本是集中对齐的。我想在标签文本下方显示下划线。但是该行应该与文本开始时的X相同（考虑中心对齐），宽度等于文本宽度（不是标签宽度）。对于下划线，我创建了一个 UIView 并设置了背景颜色。但是我无法根据需要修改下划线的长度。

以下是我使用过的代码：

  UILabel * blabel = [[UILabel alloc] initWithFrame：CGRectMake（XX，6,271,26）]; 
 blabel.text = [m_BCListArray objectAtIndex：tagcount]; 
 blabel.textAlignment = UITextAlignmentCenter; 
 blabel.backgroundColor = [UIColor clearColor]; 
 blabel.textColor = [UIColor whiteColor]; 
 blabel.font = [UIFont systemFontOfSize：14]; 
 [scrollDemo addSubview：blabel]; 
 
 //下划线码
 CGSize expectedLabelSize = [[m_BCListArray objectAtIndex：tagcount] sizeWithFont：blabel.font constrainedToSize：blabel.frame.size lineBreakMode：UILineBreakModeWordWrap]; 
 CGRect newFrame = blabel.frame; 
 newFrame.size.height = expectedLabelSize.height; 
 blabel.frame = CGRectMake（blabel.frame.origin.x，blabel.frame.origin.y，271，expectedLabelSize.height）; 
 blabel.numberOfLines = 1; 
 // [blabel sizeToFit]; 
 int width = blabel.bounds.size.width; 
 int height = blabel.bounds.size.height; 
 
 UIView * viewUnderline = [[UIView alloc] init]; 
 int len = [[m_BCListArray objectAtIndex：tagcount] length]; 
 viewUnderline.frame = CGRectMake（XX，26，len，1）; 
 viewUnderline.backgroundColor = [UIColor whiteColor]; 
 [scrollDemo addSubview：viewUnderline]; 
 [viewUnderline release]; 
  

如何根据我得到的文字修正行宽？

'的div类= h2_lin>解决方案

 的UILabel * blabel = [[的UILabel的alloc] initWithFrame：方法CGRectMake（XX，6，271，26）]; 
 blabel.text = [m_BCListArray objectAtIndex：tagcount]; 
 blabel.textAlignment = UITextAlignmentCenter; 
 blabel.backgroundColor = [UIColor clearColor]; 
 blabel.textColor = [UIColor whiteColor]; 
 blabel.font = [UIFont systemFontOfSize：14]; 
 [scrollDemo addSubview：blabel]; 
 
 //下划线码
 CGSize expectedLabelSize = [[m_BCListArray objectAtIndex：tagcount] sizeWithFont：blabel.font constrainedToSize：blabel.frame.size lineBreakMode：UILineBreakModeWordWrap]; 
 
 UIView * viewUnderline = [[UIView alloc] init]; 
 viewUnderline.frame = CGRectMake（（blabel.frame.size.width  -  expectedLabelSize.width）/ 2，expectedLabelSize.height +（blabel.frame.size.height  -  expectedLabelSize.height）/ 2，expectedLabelSize.width， 1）; 
 viewUnderline.backgroundColor = [UIColor whiteColor]; 
 [scrollDemo addSubview：viewUnderline]; 
 [viewUnderline release]; 
  

I have UILabel whose string is being set at runtime. The text in UILabel is centrally aligned. I want to display an underline below the label text. But the line should have X same where the text begins (consider center alignment) and width equal to text width (not label width). For underline I have created a UIView and have set its background color. But I am not able to fix length of underline as I want.

Below is the code I have used:

 UILabel *blabel = [[UILabel alloc] initWithFrame:CGRectMake(XX, 6, 271, 26)];
    blabel.text = [m_BCListArray objectAtIndex:tagcount];
    blabel.textAlignment = UITextAlignmentCenter;
    blabel.backgroundColor = [UIColor clearColor];
    blabel.textColor = [UIColor whiteColor];
    blabel.font = [UIFont systemFontOfSize:14];
    [scrollDemo addSubview:blabel];

    //underline code
    CGSize expectedLabelSize = [[m_BCListArray objectAtIndex:tagcount] sizeWithFont:blabel.font constrainedToSize:blabel.frame.size lineBreakMode:UILineBreakModeWordWrap];
    CGRect newFrame = blabel.frame;
    newFrame.size.height = expectedLabelSize.height;
    blabel.frame = CGRectMake(blabel.frame.origin.x, blabel.frame.origin.y, 271, expectedLabelSize.height);
    blabel.numberOfLines = 1;
    //[blabel sizeToFit];
    int width=blabel.bounds.size.width;
    int height=blabel.bounds.size.height;

    UIView *viewUnderline=[[UIView alloc] init];
    int len = [[m_BCListArray objectAtIndex:tagcount]length];
    viewUnderline.frame=CGRectMake(XX, 26, len, 1);
    viewUnderline.backgroundColor=[UIColor whiteColor];
    [scrollDemo addSubview:viewUnderline];
    [viewUnderline release];  

How can I fix the width of line according to text I get?

解决方案

UILabel *blabel = [[UILabel alloc] initWithFrame:CGRectMake(XX, 6, 271, 26)];
blabel.text = [m_BCListArray objectAtIndex:tagcount];
blabel.textAlignment = UITextAlignmentCenter;
blabel.backgroundColor = [UIColor clearColor];
blabel.textColor = [UIColor whiteColor];
blabel.font = [UIFont systemFontOfSize:14];
[scrollDemo addSubview:blabel];

//underline code
CGSize expectedLabelSize = [[m_BCListArray objectAtIndex:tagcount] sizeWithFont:blabel.font constrainedToSize:blabel.frame.size lineBreakMode:UILineBreakModeWordWrap];

UIView *viewUnderline=[[UIView alloc] init];
viewUnderline.frame=CGRectMake((blabel.frame.size.width - expectedLabelSize.width)/2,    expectedLabelSize.height + (blabel.frame.size.height - expectedLabelSize.height)/2,   expectedLabelSize.width, 1);
viewUnderline.backgroundColor=[UIColor whiteColor];
[scrollDemo addSubview:viewUnderline];
[viewUnderline release];  

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