ios - 如何快速更改字符串中所有数字的颜色

Question

我正在尝试更改 swift 代码中字符串中存在的所有数字的颜色。示例:

var mystring = "abc 3423 opqrs 474598 lmno 343543"

(将所有数字颜色更改为红色)

输出:

abc 3423 opqrs 474598 lmno 343543

-----in red----------in red-----------in red---

Answer 1

我为一个项目做了类似的事情，所以基本上这个检查它是否是一个数字并保存它的位置然后通过使用 NSAttributedString，我们可以像这样轻松地更改字符颜色:-

class ViewController: UIViewController {

@IBOutlet weak var mylabel: UILabel!
let numbers = ["0","1","2","3","4","5","6","7","8","9"]
var mystring = "abc 3423 opqrs 474598 lmno 343543"

override func viewDidLoad() {
    super.viewDidLoad()
    let myAttributedString = NSMutableAttributedString(string: "\(self.mystring)")
    var locations: [Int] = []
    let characters = mystring.characters
    var i = 0
    for letter in characters {
        i = i + 1
        letter.debugDescription
        if numbers.contains(String(letter)) {
            locations.append(i)
        }
    }

    for item in locations {
        print(item)
        let myRange = NSRange(location: item - 1, length: 1)
        myAttributedString.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(), range: myRange)
    }
    self.mylabel.attributedText = myAttributedString
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}

这是截图