UITextField Tips
Add a top Line on Keyboard
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| extension UITextField {
func addTopLineOnKeyboard() {
let line = UIView(frame: CGRect(x: 0, y: 0, width: 2000, height: 0.5))
line.backgroundColor = "979797".color
inputAccessoryView = line
}
}
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Only allow a price number with exactly two decimals
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| func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
let str = (textField.text! as NSString).replacingCharacters(in: range, with: string)
let regex = "^([1-9]\\d{0,7}|0)(\\.\\d{0,2})?$|^$"
let predicate = NSPredicate(format: "SELF MATCHES %@", regex)
return predicate.evaluate(with: str)
}
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Only allow 1-100 or leave blank
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| func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
let str = (textField.text! as NSString).replacingCharacters(in: range, with: string)
let regex = "^[1-9]?\\d|100|[1-9]?$"
let predicate = NSPredicate(format: "SELF MATCHES %@", regex)
return predicate.evaluate(with: str)
}
|
UILabel Tips
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| extension String {
var phoneNumberFormatter: String {
get {
var s = self.replacingOccurrences(of: " ", with: "")
let count = s.characters.count
if count > 7 {
s.insert(" ", at: s.index(s.startIndex, offsetBy: 3))
s.insert(" ", at: s.index(s.startIndex, offsetBy: 8))
} else if count > 3 {
s.insert(" ", at: s.index(s.startIndex, offsetBy: 3))
}
return s
}
}
}
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Highlight UILabel’s substring by given string
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| var userInputPhoneNumber = "123"
@IBOutlet private weak var phoneLabel: UILabel!
var phoneNumber: String = "123456789" {
didSet {
let atrStr = NSMutableAttributedString(string: phoneNumber.phoneNumberFormatter)
let font = UIFont.systemFont(ofSize: 14)
let range = (phoneNumber.phoneNumberFormatter as NSString).range(of: userInputPhoneNumber.phoneNumberFormatter)
if range.location == 0 {
atrStr.addAttributes([NSFontAttributeName : font, NSForegroundColorAttributeName: UIColor.red], range: (phoneNumber.phoneNumberFormatter as NSString).range(of: userInputPhoneNumber.phoneNumberFormatter))
}
phoneLabel.attributedText = atrStr
}
}
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Translated by gpt-3.5-turbo