![用UILabel文字加下划线]( "用UILabel文字加下划线")
本文介绍了用UILabel文字加下划线的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
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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