快速验证文本字段 3 [英] Validate text fields swift 3

问题描述

我正在尝试将所有文​​本字段设为必填字段，以确保用户不会将其留空.我试过这个，但由于某种原因它不起作用.我觉得我的逻辑是正确的，但这是swift逻辑的问题

I am trying to make all of my text fields required to make sure that users does not leave it empty. I tried this but for some reason it's not working. I feel like my logic is correct, but it's an issue with swift's logic

这是我的代码:

let title = txtTitle.text!
let location = txtWhere.text!
let when = txtWhen.text!


    if title != nil && location != nil && when != nil {

        var titleArray = [String]()
        var whereArray = [String]()
        var whenArray = [String]()

        let titleObject = UserDefaults.standard.object(forKey: "saveTitle")
        let whereObject = UserDefaults.standard.object(forKey: "saveLocation")
        let whenObject = UserDefaults.standard.object(forKey: "saveWhen")




        if let tempTitle = titleObject as? [String] {

            titleArray = tempTitle
            titleArray.append(txtTitle.text!)
            print(titleArray)

        }
        else {

            titleArray = [txtTitle.text!]

        }

        if let tempWhere = whereObject as? [String] {

            whereArray = tempWhere
            whereArray.append(txtWhere.text!)
            //print(titleArray)

        }
        else {

            whereArray = [txtWhere.text!]

        }

        if let tempWhen = whenObject as? [String] {

            whenArray = tempWhen
            whenArray.append(txtWhen.text!)
            //print(titleArray)

        }
        else {

            whenArray = [txtWhen.text!]

        }


        UserDefaults.standard.set(titleArray, forKey: "saveTitle")
        UserDefaults.standard.set(whereArray, forKey: "saveLocation")
        UserDefaults.standard.set(whenArray, forKey: "saveWhen")
        txtTitle.text = ""
        txtWhere.text = ""
        txtWhen.text = ""
        txtTime.text = ""

    }
        else
    {

        errMsg.isHidden = false
        errMsg.text = "All fields are required"

    }
}

推荐答案

要可靠地检查文本字段的 text 属性是否不是 nil 并且不是空的，请使用

To check reliably if the text properties of the text fields are not nil and not empty use

if let title = txtTitle.text, !title.isEmpty,
   let location = txtWhere.text, !location.isEmpty,
   let when = txtWhen.text, !when.isEmpty { ...

如果所有条件都通过，则三个变量将被安全解包.

If all conditions are passed the three variables are safely unwrapped.

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