更改NSMutableAttributedString中单个字符的颜色

Question

我在NSMutableString中使用✔字符。我想把它的颜色改成绿色。我怎么能改变它。我已经为它应用了颜色属性。

[String addAttribute:NSForegroundColorAttributeName
                       value:[UIColor greenColor]
                       range:NSMakeRange(107, 1)];

我已尝试使用字符串中的其他普通字符来解决此问题。它改变了它的颜色。但特别是这个角色不会改变颜色。如何为此角色使用绿色

Answer 1

var myString1：NSString =“（Active）”

    var myMutableString = NSMutableAttributedString()
    var str = NSString()
    str = "Name"
    myMutableString = NSMutableAttributedString(string: (str as String) + (myString1 as String), attributes: [NSFontAttributeName:UIFont(name: "Helvetica Neue", size: 18.0)!])

    myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor.grayColor(), range: NSRange(location:str.length, length:myString1.length))


    myMutableString.addAttribute(NSFontAttributeName, value: UIFont(name: "Helvetica Neue", size: 14.0)!, range: NSRange(location: str.length,length: myString1.length))

Answer 2

let result = NSMutableAttributedString(string: text)
do{

    let regex = try NSRegularExpression(pattern: "✔", options: NSRegularExpression.Options(rawValue: 0))
    let range: NSRange = NSRange(location: 0, length: text.count)
    regex.enumerateMatches(in: text, options: NSRegularExpression.MatchingOptions(rawValue: 0), range: range) { (resultTxt, flags, stop) in
        if let subStringRange = resultTxt?.range(at:0){
            result.addAttributes([.foregroundColor :color], range: subStringRange)
        }
    }
}
catch {

}

Answer 3

你可以使用✔的unicode char。

试试这个，看看：

NSString *testString = @"I am using \u2713 character in NSMutableString. I want to change its color to green. how can I change it. I have applied color attribute for it.";

NSString *tickmark = @"\u2713";
NSRange tickRange = [testString rangeOfString:tickmark];
NSMutableAttributedString * attributedString = [[NSMutableAttributedString alloc] initWithString:testString];
NSDictionary *tickAttrs = @{ NSForegroundColorAttributeName : [UIColor greenColor] };
[attributedString addAttributes:tickAttrs range:tickRange];

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(20, 120, 200, 400)];
label.font = [UIFont systemFontOfSize:20];
label.attributedText = attributedString;
label.numberOfLines = 0;
[self.view addSubview:label];

结果：