带有两个不同 colors 文本的 UILabel

Question

我想在UILabel中显示这样的字符串：

有 5 个结果。

其中数字 5 为红色，字符串的 rest 为黑色。

我怎样才能在代码中做到这一点？

Answer 1

这样做的方法是像这样使用NSAttributedString ：

NSMutableAttributedString *text = 
 [[NSMutableAttributedString alloc] 
   initWithAttributedString: label.attributedText];

[text addAttribute:NSForegroundColorAttributeName 
             value:[UIColor redColor] 
             range:NSMakeRange(10, 1)];
[label setAttributedText: text];

我创建了一个UILabel扩展来做到这一点。

Answer 2

我通过为NSMutableAttributedString创建一个category来做到这一点

-(void)setColorForText:(NSString*) textToFind withColor:(UIColor*) color
{
    NSRange range = [self.mutableString rangeOfString:textToFind options:NSCaseInsensitiveSearch];

    if (range.location != NSNotFound) {
        [self addAttribute:NSForegroundColorAttributeName value:color range:range];
    }
}

像这样使用它

- (void) setColoredLabel
{
    NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:@"Here is a red blue and green text"];
    [string setColorForText:@"red" withColor:[UIColor redColor]];
    [string setColorForText:@"blue" withColor:[UIColor blueColor]];
    [string setColorForText:@"green" withColor:[UIColor greenColor]];
    mylabel.attributedText = string;
}

SWIFT 3

extension NSMutableAttributedString{
    func setColorForText(_ textToFind: String, with color: UIColor) {
        let range = self.mutableString.range(of: textToFind, options: .caseInsensitive)
        if range.location != NSNotFound {
            addAttribute(NSForegroundColorAttributeName, value: color, range: range)
        }
    }
}

用法

func setColoredLabel() {
    let string = NSMutableAttributedString(string: "Here is a red blue and green text")
    string.setColorForText("red", with: #colorLiteral(red: 0.9254902005, green: 0.2352941185, blue: 0.1019607857, alpha: 1))
    string.setColorForText("blue", with: #colorLiteral(red: 0.2392156869, green: 0.6745098233, blue: 0.9686274529, alpha: 1))
    string.setColorForText("green", with: #colorLiteral(red: 0.3411764801, green: 0.6235294342, blue: 0.1686274558, alpha: 1))
    mylabel.attributedText = string
}

SWIFT 4 @kj13 感谢通知

// If no text is send, then the style will be applied to full text
func setColorForText(_ textToFind: String?, with color: UIColor) {

    let range:NSRange?
    if let text = textToFind{
        range = self.mutableString.range(of: text, options: .caseInsensitive)
    }else{
        range = NSMakeRange(0, self.length)
    }
    if range!.location != NSNotFound {
        addAttribute(NSAttributedStringKey.foregroundColor, value: color, range: range!)
    }
}

我对属性做了更多的实验，下面是结果，这里是SOURCECODE

这是结果

Answer 3

给你 go

NSMutableAttributedString * string = [[NSMutableAttributedString alloc] initWithString:lblTemp.text];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0,5)];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(5,6)];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(11,5)];
lblTemp.attributedText = string;

Answer 4

Swift 4

// An attributed string extension to achieve colors on text.
extension NSMutableAttributedString {

    func setColor(color: UIColor, forText stringValue: String) {
       let range: NSRange = self.mutableString.range(of: stringValue, options: .caseInsensitive)
       self.addAttribute(NSAttributedStringKey.foregroundColor, value: color, range: range)
    }

}

// Try it with label
let label = UILabel()
label.frame = CGRect(x: 70, y: 100, width: 260, height: 30)
let stringValue = "There are 5 results."
let attributedString: NSMutableAttributedString = NSMutableAttributedString(string: stringValue)
attributedString.setColor(color: UIColor.red, forText: "5")
label.font = UIFont.systemFont(ofSize: 26)
label.attributedText = attributedString
self.view.addSubview(label)

结果

Swift 3

func setColoredLabel() {
        var string: NSMutableAttributedString = NSMutableAttributedString(string: "redgreenblue")
        string.setColor(color: UIColor.redColor(), forText: "red")
        string.setColor(color: UIColor.greenColor(), forText: "green")
        string.setColor(color: UIColor.blueColor(, forText: "blue")
        mylabel.attributedText = string
    }


func setColor(color: UIColor, forText stringValue: String) {
        var range: NSRange = self.mutableString.rangeOfString(stringValue, options: NSCaseInsensitiveSearch)
        if range != nil {
            self.addAttribute(NSForegroundColorAttributeName, value: color, range: range)
        }
    }

结果：

Answer 5

//NSString *myString = @"I have to replace text 'Dr Andrew Murphy, John Smith' ";
NSString *myString = @"Not a member?signin";

//Create mutable string from original one
NSMutableAttributedString *attString = [[NSMutableAttributedString alloc] initWithString:myString];

//Fing range of the string you want to change colour
//If you need to change colour in more that one place just repeat it
NSRange range = [myString rangeOfString:@"signin"];
[attString addAttribute:NSForegroundColorAttributeName value:[UIColor colorWithRed:(63/255.0) green:(163/255.0) blue:(158/255.0) alpha:1.0] range:range];

//Add it to the label - notice its not text property but it's attributeText
_label.attributedText = attString;

Answer 6

Anups 在 swift 中回答。 可以从任何 class 重复使用。

在 swift 文件中

extension NSMutableAttributedString {

    func setColorForStr(textToFind: String, color: UIColor) {

        let range = self.mutableString.rangeOfString(textToFind, options:NSStringCompareOptions.CaseInsensitiveSearch);
        if range.location != NSNotFound {
            self.addAttribute(NSForegroundColorAttributeName, value: color, range: range);
        }

    }
}

在某些方面 controller

let attributedString: NSMutableAttributedString = NSMutableAttributedString(string: self.labelShopInYourNetwork.text!);
attributedString.setColorForStr("YOUR NETWORK", color: UIColor(red: 0.039, green: 0.020, blue: 0.490, alpha: 1.0));
self.labelShopInYourNetwork.attributedText = attributedString;

Answer 7

由于iOS 6 ， UIKit 支持绘制属性字符串，因此不需要扩展或替换。

来自UILabel ：

@property(nonatomic, copy) NSAttributedString *attributedText;

你只需要建立你的NSAttributedString 。 基本上有两种方式：

1. Append 具有相同属性的文本块 - 为每个部分创建一个NSAttributedString实例和 append 它们到一个NSMutableAttributedString

2. 从纯字符串创建属性文本，然后为给定范围添加属性 - 找到您的数字（或其他）的范围并在其上应用不同的颜色属性。

Answer 8

我的答案还可以选择为所有出现的文本着色，而不仅仅是一次出现：“wa ba wa ba dubdub”，您可以为所有出现的 wa 着色，而不仅仅是第一次出现，就像接受的答案一样。

extension NSMutableAttributedString{
    func setColorForText(_ textToFind: String, with color: UIColor) {
        let range = self.mutableString.range(of: textToFind, options: .caseInsensitive)
        if range.location != NSNotFound {
            addAttribute(NSForegroundColorAttributeName, value: color, range: range)
        }
    }

    func setColorForAllOccuranceOfText(_ textToFind: String, with color: UIColor) {
        let inputLength = self.string.count
        let searchLength = textToFind.count
        var range = NSRange(location: 0, length: self.length)

        while (range.location != NSNotFound) {
            range = (self.string as NSString).range(of: textToFind, options: [], range: range)
            if (range.location != NSNotFound) {
                self.addAttribute(NSForegroundColorAttributeName, value: color, range: NSRange(location: range.location, length: searchLength))
                range = NSRange(location: range.location + range.length, length: inputLength - (range.location + range.length))
            }
        }
    }
}

现在你可以这样做：

let message = NSMutableAttributedString(string: "wa ba wa ba dubdub")
message.setColorForText(subtitle, with: UIColor.red) 
// or the below one if you want all the occurrence to be colored 
message.setColorForAllOccuranceOfText("wa", with: UIColor.red) 
// then you set this attributed string to your label :
lblMessage.attributedText = message

Answer 9

对于这种情况，拥有一个 UIWebView 或多个 UILabel 可能被认为是矫枉过正。

我的建议是使用TTTAttributedLabel ，它是支持NSAttributedString的 UILabel 的替代品。 这意味着您可以非常轻松地将不同的 styles 应用于字符串中的不同范围。

Answer 10

为了显示不需要可编辑的简短格式化文本， Core Text是 go 的方式。 有几个使用NSAttributedString和 Core Text 进行渲染的标签开源项目。 例如，参见CoreTextAttributedLabel或OHAttributedLabel 。

Answer 11

JTAttributedLabel (by mystcolor) 允许您在 UILabel 中使用属性字符串支持在 iOS 6 下，同时它的 JTAttributedLabel class 在 iOS.

Answer 12

Swift 4 及以上：受anoop4real 解决方案的启发，这里有一个字符串扩展，可用于生成具有2 个不同colors 的文本。

extension String {

    func attributedStringForPartiallyColoredText(_ textToFind: String, with color: UIColor) -> NSMutableAttributedString {
        let mutableAttributedstring = NSMutableAttributedString(string: self)
        let range = mutableAttributedstring.mutableString.range(of: textToFind, options: .caseInsensitive)
        if range.location != NSNotFound {
            mutableAttributedstring.addAttribute(NSAttributedStringKey.foregroundColor, value: color, range: range)
        }
        return mutableAttributedstring
    }
}

以下示例将星号的颜色更改为红色，同时保留剩余文本的原始 label 颜色。

label.attributedText = "Enter username *".attributedStringForPartiallyColoredText("*", with: #colorLiteral(red: 1, green: 0, blue: 0, alpha: 1))

Answer 13

NSAttributedString是 go 的方式。 以下问题有一个很好的答案，向您展示了如何做到这一点如何使用 NSAttributedString

Answer 14

有Swift 3.0解决方案

extension UILabel{


    func setSubTextColor(pSubString : String, pColor : UIColor){
        let attributedString: NSMutableAttributedString = NSMutableAttributedString(string: self.text!);
        let range = attributedString.mutableString.range(of: pSubString, options:NSString.CompareOptions.caseInsensitive)
        if range.location != NSNotFound {
            attributedString.addAttribute(NSForegroundColorAttributeName, value: pColor, range: range);
        }
        self.attributedText = attributedString

    }
}

还有一个调用示例：

let colorString = " (string in red)"
self.mLabel.text = "classic color" + colorString
self.mLabel.setSubTextColor(pSubString: colorString, pColor: UIColor.red)

Answer 15

就我而言，我使用的是 Xcode 10.1。 Interface Builder 中的 Label 文本中有一个在纯文本和属性文本之间切换的选项

希望这可以帮助别人..！

Answer 16

对于Xamarin用户，我有一个 static C#方法，其中我传入一个字符串数组，一个 UIColours 数组和 UIFonts 数组匹配长度（需要）。 然后将属性字符串传回。

看：

public static NSMutableAttributedString GetFormattedText(string[] texts, UIColor[] colors, UIFont[] fonts) {

  NSMutableAttributedString attrString = new NSMutableAttributedString(string.Join("", texts));
  int position = 0;

  for (int i = 0; i < texts.Length; i++) {
    attrString.AddAttribute(new NSString("NSForegroundColorAttributeName"), colors[i], new NSRange(position, texts[i].Length));

    var fontAttribute = new UIStringAttributes {
      Font = fonts[I]
    };

    attrString.AddAttributes(fontAttribute, new NSRange(position, texts[i].Length));

    position += texts[i].Length;
  }

  return attrString;

}

Answer 17

extension UILabel{

    func setSubTextColor(pSubString : String, pColor : UIColor){


        let attributedString: NSMutableAttributedString = self.attributedText != nil ? NSMutableAttributedString(attributedString: self.attributedText!) : NSMutableAttributedString(string: self.text!);


        let range = attributedString.mutableString.range(of: pSubString, options:NSString.CompareOptions.caseInsensitive)
        if range.location != NSNotFound {
            attributedString.addAttribute(NSForegroundColorAttributeName, value: pColor, range: range);
        }
        self.attributedText = attributedString

    }
}

Answer 18

我自己的解决方案创建了一个类似下一个的方法：

-(void)setColorForText:(NSString*) textToFind originalText:(NSString *)originalString withColor:(UIColor*)color andLabel:(UILabel *)label{

NSMutableAttributedString *attString = [[NSMutableAttributedString alloc] initWithString:originalString];
NSRange range = [originalString rangeOfString:textToFind];

[attString addAttribute:NSForegroundColorAttributeName value:color range:range];

label.attributedText = attString;

if (range.location != NSNotFound) {
    [attString addAttribute:NSForegroundColorAttributeName value:color range:range];
}
label.attributedText = attString; }

它仅适用于同一文本中的一种不同颜色，但您可以轻松地将其调整为同一句子中的更多颜色。

Answer 19

通过使用以下代码，您可以基于单词设置多个 colors。

NSMutableArray * array = [[NSMutableArray alloc] initWithObjects:@"1 ball",@"2 ball",@"3 ball",@"4 ball", nil];    
NSMutableAttributedString *attStr = [[NSMutableAttributedString alloc] init];
for (NSString * str in array)
 {
    NSMutableAttributedString * textstr = [[NSMutableAttributedString alloc] initWithString:[NSString stringWithFormat:@"%@ ,",str] attributes:@{NSForegroundColorAttributeName :[self getRandomColor]}];
     [attStr appendAttributedString:textstr];
  }
UILabel *lab = [[UILabel alloc] initWithFrame:CGRectMake(10, 300, 300, 30)];
lab.attributedText = attStr;
[self.view addSubview:lab];

-(UIColor *) getRandomColor
{
   CGFloat redcolor = arc4random() % 255 / 255.0;
   CGFloat greencolor = arc4random() % 255 / 255.0;
   CGFloat bluencolor = arc4random() % 255 / 255.0;
   return  [UIColor colorWithRed:redcolor green:greencolor blue:bluencolor alpha:1.0];
}

Answer 20

SwiftRichString完美运行！ 您可以使用+连接两个属性字符串