有人知道如何在Swift中验证电子邮件地址吗?我找到了这个代码:

- (BOOL) validEmail:(NSString*) emailString {

    if([emailString length]==0){
        return NO;
    }

    NSString *regExPattern = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";

    NSRegularExpression *regEx = [[NSRegularExpression alloc] initWithPattern:regExPattern options:NSRegularExpressionCaseInsensitive error:nil];
    NSUInteger regExMatches = [regEx numberOfMatchesInString:emailString options:0 range:NSMakeRange(0, [emailString length])];

    NSLog(@"%i", regExMatches);
    if (regExMatches == 0) {
        return NO;
    } else {
        return YES;
    }
}

但我无法翻译成斯威夫特。


当前回答

如果你正在寻找一个干净简单的解决方案,你应该看看https://github.com/nsagora/validation-components。

它包含一个电子邮件验证谓词,很容易集成在你的代码:

let email = "test@example.com"
let rule = EmailValidationPredicate()
let isValidEmail = rule.evaluate(with: email)

在引擎盖后面,它使用RFC 5322 regex (http://emailregex.com):

let regex = "(?:[\\p{L}0-9!#$%\\&'*+/=?\\^_`{|}~-]+(?:\\.[\\p{L}0-9!#$%\\&'*+/=?\\^_`{|}" +
    "~-]+)*|\"(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21\\x23-\\x5b\\x5d-\\" +
    "x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])*\")@(?:(?:[\\p{L}0-9](?:[a-" +
    "z0-9-]*[\\p{L}0-9])?\\.)+[\\p{L}0-9](?:[\\p{L}0-9-]*[\\p{L}0-9])?|\\[(?:(?:25[0-5" +
    "]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-" +
    "9][0-9]?|[\\p{L}0-9-]*[\\p{L}0-9]:(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21" +
    "-\\x5a\\x53-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)\\])"

其他回答

这是Swift 2.0 - 2.2的更新版本

 var isEmail: Bool {
    do {
        let regex = try NSRegularExpression(pattern: "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$", options: .CaseInsensitive)
        return regex.firstMatchInString(self, options: NSMatchingOptions(rawValue: 0), range: NSMakeRange(0, self.characters.count)) != nil
    } catch {
        return false
    }
}

我建议使用它作为String的扩展:

extension String {    
    public var isEmail: Bool {
        let dataDetector = try? NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)

        let firstMatch = dataDetector?.firstMatch(in: self, options: NSRegularExpression.MatchingOptions.reportCompletion, range: NSRange(location: 0, length: length))

        return (firstMatch?.range.location != NSNotFound && firstMatch?.url?.scheme == "mailto")
    }

    public var length: Int {
        return self.characters.count
    }
}

要使用它:

if "hodor@gameofthrones.com".isEmail { // true
    print("Hold the Door")
}

斯威夫特5

 func isValidEmailAddress(emailAddressString: String) -> Bool {

 var returnValue = true
 let emailRegEx = "[A-Z0-9a-z.-_]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,3}"

 do {
        let regex = try NSRegularExpression(pattern: emailRegEx)
        let nsString = emailAddressString as NSString
        let results = regex.matches(in: emailAddressString, range: NSRange(location: 0, length: nsString.length))

        if results.count == 0
        {
            returnValue = false
        }

    } catch let error as NSError {
        print("invalid regex: \(error.localizedDescription)")
        returnValue = false
    }

    return  returnValue
}

然后:

let validEmail = isValidEmailAddress(emailAddressString: "your@email.com")
print(validEmail)

我唯一添加到响应列表的是,对于Linux, NSRegularExpression不存在,它实际上是RegularExpression

    func isEmail() -> Bool {

    let patternNormal = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,6}"

    #if os(Linux)
        let regex = try? RegularExpression(pattern: patternNormal, options: .caseInsensitive)
    #else
        let regex = try? NSRegularExpression(pattern: patternNormal, options: .caseInsensitive)
    #endif

    return regex?.firstMatch(in: self, options: [], range: NSMakeRange(0, self.characters.count)) != nil

在macOS和Ubuntu上都能成功编译。

Swift 5 -可伸缩的验证层

使用此层,您将轻松地在任何文本字段上获得惊人的验证。

只需遵循以下流程即可。

1. 添加这些枚举:

import Foundation

enum ValidatorType
{
    case email
    case name
    // add more cases ...
}

enum ValidationError: Error, LocalizedError
{
    case invalidUserName
    case invalidEmail
    // add more cases ...

    var localizedDescription: String
    {
        switch self
        {
        case .invalidEmail:
            return "Please kindly write a valid email"    
        case .invalidUserName:
            return "Please kindly write a valid user name"
        }
    }
}

2. 将此功能添加到String:

extension String
{
    // MARK:- Properties

    var isValidEmail: Bool
    {
        let emailFormat = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"
        let emailPredicate = NSPredicate(format:"SELF MATCHES %@", emailFormat)
        return emailPredicate.evaluate(with: self)
    }

    // MARK:- Methods

    func validatedText(_ validationType: ValidatorType) throws
    {
        switch validationType
        {
            case .name:
                try validateUsername()
            case .email:
                try validateEmail()
        }
    }

    // MARK:- Private Methods

    private func validateUsername() throws
    {
        if isEmpty
        {
            throw ValidationError.invalidUserName
        }
    }

    private func validateEmail() throws
    {
        if !isValidEmail 
        {
            throw ValidationError.invalidEmail
        }

        // add more validations if you want like empty email
    }
}

3.添加以下功能到UITextField:

import UIKit

extension UITextField
{
    func validatedText(_ validationType: ValidatorType) throws
    {
        do
        {
            try text?.validatedText(validationType)
        }
        catch let validationError
        {
            shake()
            throw validationError
        }
    }

    // MARK:- Private Methods

    private func shake()
    {
        let animation = CABasicAnimation(keyPath: "position")
        animation.duration = 0.1
        animation.repeatCount = 5
        animation.fromValue = NSValue(cgPoint: CGPoint(x: center.x + 6, y: center.y))
        animation.toValue = NSValue(cgPoint: CGPoint(x: center.x - 6, y: center.y))
        layer.add(animation, forKey: "position")
    }
}

使用

import UIKit

class LoginVC: UIViewController
{
    // MARK: Outlets

    @IBOutlet weak var textFieldEmail: UITextField!

    // MARK: View Controller Life Cycle

    override func viewDidLoad()
    {
        super.viewDidLoad()
    }

    // MARK: Methods

    private func checkEmail() -> Bool
    {
        do
        {
            try textFieldEmail.validatedText(.email)
        }
        catch let error
        {
            let validationError = error as! ValidationError
            // show alert to user with: validationError.localizedDescription
            return false
        }

        return true
    }

    // MARK: Actions

    @IBAction func loginTapped(_ sender: UIButton)
    {
        if checkEmail()
        {
            let email = textFieldEmail.text!
            // move safely ...
        }
    }
}