ios - UILabel：自定义下划线颜色？

Question

我需要 a 的文本为UILabel黑色，但文本下方有浅灰色下划线。这可以用NSAttributedStringorTTTAttributedLabel吗？或者是否需要使用 Core Graphics 进行自定义绘图？

澄清：我需要不同颜色下划线的特定颜色文本。示例：红色下划线上的蓝色文本。

Answer 1

你可以做NSAttributedString如下。

NSMutableAttributedString* string = [[NSMutableAttributedString alloc]initWithString:@"you string"];
[string addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, string.length)];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor blackColor] range:NSMakeRange(0, string.length)];//TextColor
[string addAttribute:NSUnderlineStyleAttributeName value:underlineNumber range:NSMakeRange(0, string.length)];//Underline color
[string addAttribute:NSUnderlineColorAttributeName value:[UIColor lightGrayColor] range:NSMakeRange(0, string.length)];//TextColor
 yourlabel. attributedText = string;

注意：您还可以像在这篇文章中一样在特定范围的字符串下划线。另请注意，它仅适用于 ios6+。

Answer 2

NSMutableAttributedString我们总是可以在一行中创建多个属性（使用 NSDictionary 符号 - @ { } ）到包含实际文本的特定UILabel ，而不是创建本地并逐个添加属性。

目标 C：

[someUILabel setAttributedText:
  [[NSAttributedString alloc] initWithString:[NSString stringWithFormat:@"%@", [someObject stringProperty]]
                                  attributes:@{NSUnderlineStyleAttributeName:@(NSUnderlineStyleThick),
                                              NSUnderlineColorAttributeName:[[UIColor alloc] initWithRed:0.953f green:0.424f blue:0.416f alpha:1.00f]}]];

在上面的示例中，我们设置了一个也是粗体的下划线 - 总共 2 个属性。

斯威夫特：

self.someUIButton.setAttributedTitle(NSAttributedString(string: "UIButtonStringTitle", attributes: [NSUnderlineStyleAttributeName : 1]), forState: .Normal)

Answer 3

// Print `str` in black, and underline the word STRING in gray.
NSMutableAttributedString *str = [[NSMutableAttributedString alloc]initWithString:@"This is my STRING"];
[str addAttribute:NSForegroundColorAttributeName value:[UIColor blackColor] range:NSMakeRange(0, str.length-7)];
[str addAttribute:NSUnderlineColorAttributeName value:[UIColor grayColor] range:NSMakeRange([str length]-6, 6)];
[str addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInt:NSUnderlineStyleSingle] range:NSMakeRange([str length]-6, 6)];

_label.attributedText = str; // assuming you have an iVar name `label`

Answer 4

NSAttributedString *title;

title = [[NSAttributedString alloc] initWithString:@"iphone app" for NSAttributedString" attributes:@{ NSFontAttributeName : [UIFont fontWithName:@"Noteworthy-Bold" size:36], NSUnderlineStyleAttributeName : @1 , NSStrokeColorAttributeName : [UIColor blackColor]}]; 

UILabel *label;

label = [[UILabel alloc] initWithFrame:CGRectMake( (self.view.bounds.size.width - title.size.width) / 2.0f, 40.0f, title.size.width, title.size.height)];
label.attributedText = title; 
[self.view addSubview:label];

Answer 5

m-farhan.com  farhan will be underlined

//-----------------------------
    // Create attributed string
    //-----------------------------
    NSString *str = @"m-Farhan.com";
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:str];

    // Add attribute NSUnderlineStyleAttributeName
    [attributedString addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInt:NSUnderlineStyleSingle] range:NSMakeRange(2, 4)];

    // Set background color for entire range
    [attributedString addAttribute:NSBackgroundColorAttributeName
      value:[UIColor colorWithRed:0.103 green:0.305 blue:0.492 alpha:1.000]
      range:NSMakeRange(0, [attributedString length])];

    // Define label
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, 20, 280, 80)];
    [label setLineBreakMode:UILineBreakModeWordWrap];
    [label setTextColor:[UIColor whiteColor]];
    [label setBackgroundColor:[UIColor clearColor]];
    [label setTextAlignment:UITextAlignmentLeft];

    // Set label text to attributed string
    [label setAttributedText:attributedString];
    [[self view] addSubview:label];

Answer 6

迅速使用NSAttributedString.Key.underlineColor.