问题描述
所以我想在打字时验证用户 ip.在 VC 中,我执行了以下操作:
So i want to validate the user ip during typing.In the VC i did the following :
extension NetworkSettingsViewController: UITextFieldDelegate {
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
self.staticMask.resignFirstResponder()
self.staticGateway.resignFirstResponder()
self.staticIp.resignFirstResponder()
self.staticDns.resignFirstResponder()
return true
}
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
var isValidate: Bool
//verify deletion not happening
if !(range.length == 1) {
if validatorManager.verifyTarget(test: string) {
isValidate = true
} else {
isValidate = false
}
} else {
isValidate = true
}
return isValidate
}
}
这是验证类:
class ValidatorManager: NSObject {
func verifyTarget(test: String) -> Bool {
// let validIpAddressRegex = "^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$"
let validIpAddressRegex = "^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])[.]){0,3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])?$"
let ipTest = NSPredicate(format:"SELF MATCHES %@", validIpAddressRegex)
print(ipTest.evaluate(with:test))
return ipTest.evaluate(with:test)
}
}
我尝试了 2 个正则表达式,但什么也没有.我想逐个字符检查字符,然后检查所有八位字节的 dot() 之前的所有 3 个字符.
i have tried the 2 regex but nothing.i want to check char by char and then all the 3 before the dot() for all the octets.
推荐答案
这里有两个函数:第一个检查用户输入的内容是否有效(未完成的 IP),第二个检查整个事情:
Here are two functions: the first one checks what the user is typing is valid (unfinished IP), and the second one checks the whole thing:
func verifyWhileTyping(test: String) -> Bool {
let pattern_1 = "^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])[.]){0,3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])?$"
let regexText_1 = NSPredicate(format: "SELF MATCHES %@", pattern_1)
let result_1 = regexText_1.evaluate(with: test)
return result_1
}
func verifyWholeIP(test: String) -> Bool {
let pattern_2 = "(25[0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})\\.(25[0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})\\.(25[0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})\\.(25[0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})"
let regexText_2 = NSPredicate(format: "SELF MATCHES %@", pattern_2)
let result_2 = regexText_2.evaluate(with: test)
return result_2
}
在 textField(_ textField: , shouldChangeCharactersIn range:, replacementString string:)
中使用 verifyWhileTyping(test:)
在打字时检查.当用户完成并单击按钮或点击 Enter 键调用 verifyWholeIP(test:)
:
Use verifyWhileTyping(test:)
in textField(_ textField: , shouldChangeCharactersIn range:, replacementString string:)
To check while typing. When the user is finished and clicks a button or hits the Enter key call verifyWholeIP(test:)
:
//While typing
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if let text = textField.text {
verifyWhileTyping(test: text + string)
}
//...
}
//When Enter is tapped
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
if let text = textField.text {
verifyWholeIP(test: text)
}
//...
return true
}
pattern_1
在用户输入时检查它是否是正确 IP 的开头:
pattern_1
checks as the user is typing if it is the beginning of correct IP:
regexText_1.evaluate(with: "0") //true
regexText_1.evaluate(with: "255") //true
regexText_1.evaluate(with: "256") //false
regexText_1.evaluate(with: "10.10.") //true
regexText_1.evaluate(with: "1.2..") //false
regexText_1.evaluate(with: "1.2.3.4") //true
regexText_1.evaluate(with: "1.2.3.4.") //false
对于pattern_2
,它评估整个IPv4:
"(25[0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})\\.(25[0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})\\.(25[0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})\\.(25[0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})"
这里有更多测试用例:
regexText_2.evaluate(with: "0.0.0.0") //true
regexText_2.evaluate(with: "1.1.1.256") //false
regexText_2.evaluate(with: "-1.0.1.2") //false
regexText_2.evaluate(with: "12.34.56") //false
regexText_2.evaluate(with: "I.am.an.IP") //false
对于 IPv6,这是要使用的正则表达式:"[0-9A-Fa-f]{1,4}"
in pattern_2
.
For IPv6 this the regex to use: "[0-9A-Fa-f]{1,4}"
in pattern_2
.
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