使用 RxSwift 和 RXCocoa 在按钮单击时验证所有文本字段

Question

我是 RxSwift 和 RxCocoa 的新手，正在学习。

我想在单击按钮时验证所有文本字段，并且根据验证我需要向用户显示警告消息。

验证成功后我需要在table中插入记录。

参考以下代码...

var result = txtFname.rx.text
    result.asObservable().subscribe(onNext: { text in
        if text!.isEmpty {
            self.showAlert(msg: "Plese enter first name.")
            self.txtFname.becomeFirstResponder()
        }
    }).disposed(by: disposeBag)

    result = txtLname.rx.text
    result.asObservable().subscribe(onNext: { text in
        if text!.isEmpty {
            self.showAlert(msg: "Please enter last name.")
            self.txtLname.becomeFirstResponder()
        }
    }).disposed(by: disposeBag)

    result = txtEmail.rx.text
    result.asObservable().subscribe(onNext: { text in

        if text!.isEmpty {
            self.showAlert(msg: "Please enter email id.")
            self.txtLname.becomeFirstResponder()
        }
    }).disposed(by: disposeBag)

   //need to check here if all fields are valid or not 
   //if all fields are valid then insert record....

当我按下一个按钮时，它一次检查所有验证并显示警报...

但我想做的是，如果一次验证失败，那么在上一次验证成功之前，它不应该再进一步...

我不知道如何实现。任何帮助将不胜感激。

Answer 1

你可以这样做。

  self.button.rx.tap.asObservable()
     .filter({ (_) -> Bool in
        guard !(self.txtFname.text ?? "").isEmpty else {
           self.showAlert(msg: "Please enter first name.")
           self.txtFname.becomeFirstResponder()
           return false
        }

        guard !(self.txtLname.text ?? "").isEmpty else {
           self.showAlert(msg: "Please enter last name.")
           self.txtLname.becomeFirstResponder()
           return false
        }

        guard !(self.txtEmail.text ?? "").isEmpty else {
           self.showAlert(msg: "Please enter email id.")
           self.txtEmail.becomeFirstResponder()
           return false
        }

        return true
     })
     .subscribe { _ in
        // do something when all the fields are valid
        self.showAlert(msg: "All fields are valid")
     }
     .disposed(by: disposeBag)

Answer 2

这不是完全相同的答案，但您可以实现类似的结果。

      class DataValidator {
            class func validName(name:String) -> Bool {
            if let regex =
            try? NSRegularExpression(pattern: "^\w+( \w+\.?)*$", options:
            .CaseInsensitive) {
            return name.lengthOfBytesUsingEncoding(NSUTF8StringEncoding) > 2 &&
            regex!.matchesInString(name, options: NSMatchingOptions.ReportProgress, range: NSMakeRange(0,
            name.lengthOfBytesUsingEncoding(NSUTF8StringEncoding))).count > 0 }
            return false }

            class func validEmail(email:String) -> Bool{ if let regex =
            try? NSRegularExpression(pattern: "^\S+@\S+\.\S+$", options: .CaseInsensitive){
            return regex!.matchesInString(email, options: NSMatchingOptions.ReportProgress, range: NSMakeRange(0,
            email.lengthOfBytesUsingEncoding(NSUTF8StringEncoding))).count > 0 }
        return false }
 }

}// end of validator class

您可以使用如下内容：

let nameSignal:RACSignal = nameTextField.rac_textSignal().map { (text) -> AnyObject! in
return DataValidator.validName(text as! String) }
let emailSignal = emailTextField.rac_textSignal().map { (text) -> AnyObject! in
return DataValidator.validEmail(text as! String) }

RACSignal.combineLatest([nameSignal, emailSignal]).subscribeNext { (valid) -> Void in
   self.button.enabled = valid as! Bool
}

Answer 3

class Validator {

    class func validEmail(email:String) -> Bool {
        if let regex = try? NSRegularExpression(pattern: "^\S+@\S+\.\S+$", options: .caseInsensitive){
        return regex.matches(in: email, options: NSRegularExpression.MatchingOptions.reportProgress, range: NSMakeRange(0,                                                                                                                        email.lengthOfBytes(using: String.Encoding.utf8))).count > 0 }
        return false
    }
}

那么就可以这样使用了：

var isValid : Observable<Bool>{
    return Observable.combineLatest(username.asObservable())
    { (username) in
        return Validator.validEmail(email: username)
    }
}

使用 RxSwift 和 RXCocoa 在按钮单击时验证所有文本字段

Validate all textfield on button click using RxSwift and RXCocoa

uibutton

ios

swift

rx-swift

rx-cocoa