是否可以在UITextView和UITextField中更改单个单词的颜色

Question

是否可以在UITextView和UITextField中更改单个单词的颜色？

如果我输入了一个带有符号前面的单词(例如:@word),它的颜色可以改变吗？

Answer 1

是的,您需要使用NSAttributedString它,找到RunningAppHere.

扫描单词并找到单词的范围并更改其颜色.

编辑:

- (IBAction)colorWord:(id)sender {
    NSMutableAttributedString * string = [[NSMutableAttributedString alloc]initWithString:self.text.text];

    NSArray *words=[self.text.text componentsSeparatedByString:@" "];

    for (NSString *word in words) {        
        if ([word hasPrefix:@"@"]) {
            NSRange range=[self.text.text rangeOfString:word];
            [string addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:range];           
        }
    }
    [self.text setAttributedText:string];
}

编辑2:看截图

Answer 2

这是@Anoop Vaidya回答的快速实现,这个函数检测{| myword |}之间的任何单词,用红色着色这些单词并删除特殊字符,希望这可以帮助别人:

 func getColoredText(text:String) -> NSMutableAttributedString{
    var string:NSMutableAttributedString = NSMutableAttributedString(string: text)
    var words:[NSString] = text.componentsSeparatedByString(" ")

    for (var word:NSString) in words {
        if (word.hasPrefix("{|") && word.hasSuffix("|}")) {
            var range:NSRange = (string.string as NSString).rangeOfString(word)
            string.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(), range: range)
            word = word.stringByReplacingOccurrencesOfString("{|", withString: "")
            word = word.stringByReplacingOccurrencesOfString("|}", withString: "")
            string.replaceCharactersInRange(range, withString: word)
        }
    }
    return string
}

你可以像这样使用它:

self.msgText.attributedText = self.getColoredText("i {|love|} this!")

Answer 3

修改了@fareed对swift 2.0的回答,这是有效的(在游乐场测试):

func getColoredText(text: String) -> NSMutableAttributedString {
    let string:NSMutableAttributedString = NSMutableAttributedString(string: text)
    let words:[String] = text.componentsSeparatedByString(" ")
    var w = ""

    for word in words {
        if (word.hasPrefix("{|") && word.hasSuffix("|}")) {
            let range:NSRange = (string.string as NSString).rangeOfString(word)
            string.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(), range: range)
            w = word.stringByReplacingOccurrencesOfString("{|", withString: "")
            w = w.stringByReplacingOccurrencesOfString("|}", withString: "")
            string.replaceCharactersInRange(range, withString: w)
        }
    }
    return string
}

getColoredText("i {|love|} this!")