我有一个数字,比如说0.00
。
- 当用户点击 1 时,我们应该得到
0.01
- 当用户点击 2 时,我们应该显示
0.12
- 当用户点击 3 时,我们应该显示
1.23
- 当用户点击 4 时,我们应该显示
12.34
如何使用 Swift 做到这一点?
最佳答案
对于Swift 3。在文本字段中输入货币格式(从右到左)
override func viewDidLoad() {
super.viewDidLoad()
textField.addTarget(self, action: #selector(myTextFieldDidChange), for: .editingChanged)
}
@objc func myTextFieldDidChange(_ textField: UITextField) {
if let amountString = textField.text?.currencyInputFormatting() {
textField.text = amountString
}
}
extension String {
// formatting text for currency textField
func currencyInputFormatting() -> String {
var number: NSNumber!
let formatter = NumberFormatter()
formatter.numberStyle = .currencyAccounting
formatter.currencySymbol = "$"
formatter.maximumFractionDigits = 2
formatter.minimumFractionDigits = 2
var amountWithPrefix = self
// remove from String: "$", ".", ","
let regex = try! NSRegularExpression(pattern: "[^0-9]", options: .caseInsensitive)
amountWithPrefix = regex.stringByReplacingMatches(in: amountWithPrefix, options: NSRegularExpression.MatchingOptions(rawValue: 0), range: NSMakeRange(0, self.count), withTemplate: "")
let double = (amountWithPrefix as NSString).doubleValue
number = NSNumber(value: (double / 100))
// if first number is 0 or all numbers were deleted
guard number != 0 as NSNumber else {
return ""
}
return formatter.string(from: number)!
}
}
关于ios - 如何使用 Swift 在文本字段(从右到左)输入货币格式?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51966539/