遍历子视图以检查是否为空的UITextField-Swift

我想知道如何从本质上将下面的目标c代码转换为快速代码。

这将遍历我所需视图上的所有子视图,检查它们是否为文本字段,然后检查是否为空。

for (UIView *view in contentVw.subviews) {

NSLog(@"%@", view);

if ([view isKindOfClass:[UITextField class]]) {

UITextField *textfield = (UITextField *)view;

if (([textfield.text isEqualToString:""])) {

//show error

return;

}

}

}

到目前为止,这里是我快速翻译的地方:

for view in self.view.subviews as [UIView] {

if view.isKindOfClass(UITextField) {

//...

}

}

任何帮助将是巨大的!

回答:

Swift 5和Swift

4:-一个非常简单的答案,您可以轻松理解:-您可以处理各种对象,例如UILable,UITextfields,UIButtons,UIView,UIImages。任何种类的对象等

for subview in self.view.subviews

{

if subview is UITextField

{

//MARK: - if the sub view is UITextField you can handle here

if subview.text == ""

{

//MARK:- Handle your code

}

}

if subview is UIImageView

{

//MARK: - check image

if subview.image == nil

{

//Show or use your code here

}

}

}

//MARK:- You can use it any where, where you need it

//Suppose i need it in didload function we can use it and work it what do you need

override func viewDidLoad() {

super.viewDidLoad()

for subview in self.view.subviews

{

if subview is UITextField

{

//MARK: - if the sub view is UITextField you can handle here

if subview.text == ""

{

//MARK:- Handle your code

}

}

if subview is UIImageView

{

//MARK: - check image

if subview.image == nil

{

//Show or use your code here

}

}

}

}

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