我是Swift IOS开发的新蜜蜂,我需要仅允许数字和字母,而无需任何whitespace,恰好将8个字符输入UITEXTFIELD。
。对于没有任何空白的数字和字母,我遵循逻辑:
extension [YourViewController]: UITextFieldDelegate
{
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
do {
let regex = try NSRegularExpression(pattern: ".*[^A-Za-z0-9 ].*", options: [])
if regex.firstMatch(in: string, options: [], range: NSMakeRange(0, string.count)) != nil {
return false
}
}
catch {
print("ERROR")
}
return true
}
}
我想将精确的8个字符的逻辑与此一起包含。如何实现!?
尝试此代码,它可能会帮助您实现目标:
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
do {
let text = (textField.text! as NSString).replacingCharacters(in: range, with: string)
let regex = try NSRegularExpression(pattern: "^([a-zA-Z0-9]{0,10})$", options: [])
if regex.firstMatch(in: text, options: [], range: NSMakeRange(0, text.count)) != nil {
return true
}
}
catch {
print("ERROR")
}
return false
}