以编程方式在 UIView 上添加 UITextField Swift答案

【问题标题】：Adding UITextField on UIView Programmatically Swift以编程方式在 UIView 上添加 UITextField Swift
【发布时间】：2014-07-12 05:45:58
【问题描述】：

我是 Swift 和 iOS 编程的新手。我试图使用 Swift 以编程方式创建一个UITextField，但不能完全正确。另外，如何将其更改为具有半透明效果以淡入背景？

var myField: UITextField = UITextField (frame:CGRectMake(10, 10, 30, 10));
self.addSubview(myField)

【问题讨论】：

标签： ios swift

【解决方案1】：

Swift 3 和 Swift 4.2：

override func viewDidLoad() {
    super.viewDidLoad()

    let sampleTextField =  UITextField(frame: CGRect(x: 20, y: 100, width: 300, height: 40))
    sampleTextField.placeholder = "Enter text here"
    sampleTextField.font = UIFont.systemFont(ofSize: 15)
    sampleTextField.borderStyle = UITextField.BorderStyle.roundedRect
    sampleTextField.autocorrectionType = UITextAutocorrectionType.no
    sampleTextField.keyboardType = UIKeyboardType.default
    sampleTextField.returnKeyType = UIReturnKeyType.done
    sampleTextField.clearButtonMode = UITextField.ViewMode.whileEditing
    sampleTextField.contentVerticalAlignment = UIControl.ContentVerticalAlignment.center
    sampleTextField.delegate = self
    self.view.addSubview(sampleTextField)
}

委托方法：

// MARK:- ---> UITextFieldDelegate

extension ViewController: UITextFieldDelegate {

    func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
        // return NO to disallow editing.
        print("TextField should begin editing method called")
        return true
    }

    func textFieldDidBeginEditing(_ textField: UITextField) {
        // became first responder
        print("TextField did begin editing method called")
    }

    func textFieldShouldEndEditing(_ textField: UITextField) -> Bool {
        // return YES to allow editing to stop and to resign first responder status. NO to disallow the editing session to end
        print("TextField should snd editing method called")
        return true
    }

    func textFieldDidEndEditing(_ textField: UITextField) {
        // may be called if forced even if shouldEndEditing returns NO (e.g. view removed from window) or endEditing:YES called
        print("TextField did end editing method called")
    }

    func textFieldDidEndEditing(_ textField: UITextField, reason: UITextFieldDidEndEditingReason) {
        // if implemented, called in place of textFieldDidEndEditing:
        print("TextField did end editing with reason method called")
    }

    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        // return NO to not change text
        print("While entering the characters this method gets called")
        return true
    }

    func textFieldShouldClear(_ textField: UITextField) -> Bool {
        // called when clear button pressed. return NO to ignore (no notifications)
        print("TextField should clear method called")
        return true
    }

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        // called when 'return' key pressed. return NO to ignore.
        print("TextField should return method called")
        // may be useful: textField.resignFirstResponder()
        return true
    }

}

// MARK: UITextFieldDelegate <---

Swift 2.0：

let sampleTextField = UITextField(frame: CGRectMake(20, 100, 300, 40))
sampleTextField.placeholder = "Enter text here"
sampleTextField.font = UIFont.systemFontOfSize(15)
sampleTextField.borderStyle = UITextBorderStyle.RoundedRect
sampleTextField.autocorrectionType = UITextAutocorrectionType.No
sampleTextField.keyboardType = UIKeyboardType.Default
sampleTextField.returnKeyType = UIReturnKeyType.Done
sampleTextField.clearButtonMode = UITextFieldViewMode.WhileEditing;
sampleTextField.contentVerticalAlignment = UIControlContentVerticalAlignment.Center
sampleTextField.delegate = self
self.view.addSubview(sampleTextField)

委托方法：

    // MARK:- ---> Textfield Delegates
    func textFieldDidBeginEditing(textField: UITextField) {
        print("TextField did begin editing method called")
    }

    func textFieldDidEndEditing(textField: UITextField) {
        print("TextField did end editing method called")
    }

    func textFieldShouldBeginEditing(textField: UITextField) -> Bool {
        print("TextField should begin editing method called")
        return true;
    }

    func textFieldShouldClear(textField: UITextField) -> Bool {
        print("TextField should clear method called")
        return true;
    }

    func textFieldShouldEndEditing(textField: UITextField) -> Bool {
        print("TextField should snd editing method called")
        return true;
    }

    func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
        print("While entering the characters this method gets called")
        return true;
    }

    func textFieldShouldReturn(textField: UITextField) -> Bool {
        print("TextField should return method called")
        textField.resignFirstResponder();
        return true;
    }
    // MARK: Textfield Delegates <---

【讨论】：

我能够以编程方式创建文本字段，但是我在哪里或如何为这个文本字段创建一个出口？当按下按钮时，我需要读取此字段中的值运行一些代码。
没关系，我想通了。就像sampleTextField.text 一样简单:)
如何以编程方式添加多个文本字段？如果有输入则在循环中
@XcodianSolangi 在这里查看：gist.github.com/AshokKumarYes/f064f25787607cca46932fc76555be26

【解决方案2】：

self.addSubview(myTextField)

仅当您使用 UIView 的子类时才有效。

您必须将其添加为 ViewController 层次结构的 UIView 的子视图。

var txtField: UITextField = UITextField(frame: CGRect(x: 0, y: 0, width: 500.00, height: 30.00));
self.view.addSubview(txtField)

默认背景颜色为白色，它可能不会出现。您需要提供样式以及文本颜色和背景颜色。

txtField.borderStyle = UITextBorderStyle.Line
txtField.text = "myString" 
txtField.backgroundColor = UIColor.redColor()

欲了解更多信息，here

【讨论】：

也不应该是 let 而不是 var 吗？- 你仍然可以更改类属性，而且不太可能需要重新分配。

【解决方案3】：

为 Swift 3 和 Xcode 8.2 更新

    let stepsTextField = UITextField(frame: CGRect(x: 20, y: 100, width: 300, height: 40))
    stepsTextField.placeholder = "Enter text here"
    stepsTextField.font = UIFont.systemFont(ofSize: 15)
    stepsTextField.borderStyle = UITextBorderStyle.roundedRect
    stepsTextField.autocorrectionType = UITextAutocorrectionType.no
    stepsTextField.keyboardType = UIKeyboardType.default
    stepsTextField.returnKeyType = UIReturnKeyType.done
    stepsTextField.clearButtonMode = UITextFieldViewMode.whileEditing;
    stepsTextField.contentVerticalAlignment = UIControlContentVerticalAlignment.center

【讨论】：

【解决方案4】：

试试下面的代码

var textFiled = UITextField(frame: CGRectMake(20.0, 30.0, 100.0, 33.0))
        textFiled.backgroundColor = UIColor.redColor()
        textFiled.borderStyle = UITextBorderStyle.Line
        self.view.addSubview(textFiled)

【讨论】：

【解决方案5】：

您可以在 Swift 5.2 中使用以下代码：

lazy var titleTextField:UITextField = {
    let textField = UITextField()
    textField.translatesAutoresizingMaskIntoConstraints = false
    textField.placeholder = "Title *"
    textField.keyboardType = UIKeyboardType.default
    textField.returnKeyType = UIReturnKeyType.done
    textField.autocorrectionType = UITextAutocorrectionType.no
    textField.font = UIFont.systemFont(ofSize: 13)
    textField.borderStyle = UITextField.BorderStyle.roundedRect
    textField.clearButtonMode = UITextField.ViewMode.whileEditing;
    textField.contentVerticalAlignment = UIControl.ContentVerticalAlignment.center
    return textField
}()

【讨论】：

【解决方案6】：

您需要将文本字段添加到self.view 而不是self。

var myField: UITextField = UITextField (frame:CGRectMake(10, 10, 30, 10));
self.view.addSubview(myField)

关于添加半透明模糊效果已经有一些建议，你可以通过 -

UIView border with fade or blur effect

【讨论】：

【解决方案7】：

在 UIView 上添加 textField 是

var textField=UITextField(frame:CGRectMake(x,y,width,height));
self.view.addSubView(textField)

【讨论】：

【解决方案8】：

确保您在 viewDidLoad() 中，然后只需添加以下代码即可生成一个 textField：

let myTextField: UITextField = UITextField(frame: CGRect(x: 0, y: 0, width: 200.00, height: 40.00));
    self.view.addSubview(myTextField)

    myTextField.backgroundColor = UIColor.redColor()
    myTextField.text = "some string"
    myTextField.borderStyle = UITextBorderStyle.Line

【讨论】：

【解决方案9】：

在viewDidLoad()中编写代码并实现委托UITextFieldDelegate

let _textField: UITextField = UITextField(frame: CGRect(x: 0, y: 0, width: 200.00, height: 40.00))
_textField.backgroundColor = UIColor.redColor()
_textField.text = "some string"
_textField.delegate = self
_textField.borderStyle = UITextBorderStyle.Line
self.view.addSubview(_textField)

【讨论】：