如何快速从视图中获取所有文本字段

Question

我有一个超过 15 个UITextFields 的视图。我必须为所有UITextFields 设置bottomBorder(extension)。我可以为所有UITextFields 以及它的工作一一设置它。我想一次为所有UITextFields 设置底部边框。这是我正在尝试的代码，但似乎 for 循环没有执行。我什至在viewDidLayoutSubViews 中尝试过，但 for 循环也没有在那里执行。

 override func viewDidLoad() 
{
    super.viewDidLoad()

    /** setting bottom border of textfield**/

    for case let textField as UITextField in self.view.subviews {
        textField.setBottomBorder()
    }
}

Answer 1

斯威夫特 5
一个非常简单的答案，您可以轻松理解 : - 您可以处理所有类型的对象，如 UILable、UITextfields、UIButtons、UIView、UIImages。任何类型的对象等。

for subviews in self.view.subviews {
    if subviews is UITextField
    {
        //MARK: - if the sub view is UITextField you can handle here
        funtextfieldsetting(textfield: subviews as! UITextField)
    }
    if subviews is UIButton
    {
        //MARK: - if the sub view is UIButton you can handle here
        funbuttonsetting(button: subviews as! UIButton)
    }
    if subviews is UILabel
    {
        //MARK: - if the sub view is UILabel you can handle here
        //Any thing you can do it with label or textfield etc
           
     }
 }

Answer 2

Swift：此函数将返回视图中的所有文本字段。无论字段是否存在于任何子视图中。 ;-)

func getAllTextFields(fromView view: UIView)-> [UITextField] {
    return view.subviews.flatMap { (view) -> [UITextField]? in
        if view is UITextField {
            return [(view as! UITextField)]
        } else {
            return getAllTextFields(fromView: view)
        }
    }.flatMap({$0})
}

用法：

_=getAllTextFields(fromView : self.view).map{($0.text = "Hey dude!")}

Answer 3

扩展名：

extension UIView {
    func viewOfType<T:UIView>(type:T.Type, process: (_ view:T) -> Void)
    {        
        if let view = self as? T
        {
            process(view)
        }
        else {
            for subView in subviews
            {
                subView.viewOfType(type:type, process:process)
            }
        }
    }
}

用法：

view.viewOfType(type:UITextField.self) {
        view in

        view.text = "123"
}

Answer 4

func getTextFields() {
    for textField in view.subviews where view is UITextField {
       (textField as? UITextField).setBottomBorder()
    }
}

Answer 5

这对我有用。

var textFieldsArray = [UITextField]()

for view in self.view.subviews {
    if view is UITextField {
        textFieldsArray.append(view as! UITextField)
    }
}

textFieldsArray.forEach { $0.setBottomBorder() }

如果你想在一个新的数组中获取函数的结果，使用 map() 代替。

Answer 6

我让它工作了，但仍然需要解释为什么有问题的代码不能工作
我从论坛上的某个地方得到它，不能完全相信答案。

/** extract all the textfield from view **/
func getTextfield(view: UIView) -> [UITextField] {
var results = [UITextField]()
for subview in view.subviews as [UIView] {
    if let textField = subview as? UITextField {
        results += [textField]
    } else {
        results += getTextfield(view: subview)
    }
}
return results  

在 viewDidLoad 或 viewDidLayoutSubviews 中调用上述函数。

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()

/** setting bottom border to the textfield **/
    let allTextField = getTextfield(view: self.view)
    for txtField in allTextField
    {
        txtField.setBottomBorder()
    }
}

Answer 7

试试这个:)

for view in self.view.subviews as! [UIView] {
    if let textField = view as? UITextField {
        textField.setBottomBorder()
    }
}

Answer 8

试试这个

for aSubView: Any in self.view.subviews {
if (aSubView is UITextField) {
    var textField = (aSubView as! UITextField)
    textField. setBottomBorder()
}
}     

或者试试这个

for view in self.view.subviews {
if (view is UITextField) {
     var textField = view as! UITextField
      textField. setBottomBorder()
}
}