ios - 如何在 swift ios 中以编程方式添加多个文本字段

Question

我试图通过运行循环来显示多个textFields，无论文本字段noTextField的数量是否大于零(这是一个输入值)，它应该在 ViewController 上显示多个文本字段。

这是我有一个文本字段并打印多个 hello 但无法显示多个文本字段。

我有什么

enter image description here

我想要什么

enter image description here

            if self.noTextFields! > 0 {
            for _ in 0..<self.noTextFields! {
               // self.createForm()
                print ("hello")


                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 = 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 as? UITextFieldDelegate
                self.view.addSubview(sampleTextField)

            }
        }

Answer 1

错误和更正:

1. 通过打印在日志中的 self.view.items 值来检查 self.view 的 SubView 项目内容。
2. 您尚未为要分配给任何增量位置的 +1 计数器文本字段分配 X/Y 位置，因此即使创建了新对象，它也会重叠在前一个项目上。
3. 我总是建议在执行 addSubview 调用时，在 self.view.addSubview(sampleTextField) 调用之后立即将文本字段对象放入数组中。这将帮助我在需要修改/访问/取消分配时保存每个文本字段项目的引用。
4. 您还可以为每个文本字段对象设置标签，因此如果您不希望使用数组，最好使用 [self.view viewWithTag:tagNo] 调用从 subview 中获取带有该标签的对象。

您的代码片段看起来像

     var xValue = 0,yValue =0
     var tagNo = 0  
     var textObjects = allocate new array.

     if self.noTextFields! > 0 {
                for _ in 0..<self.noTextFields! {
                   // self.createForm()
                    print ("hello")

                    let sampleTextField =  UITextField(frame: CGRect(x: xValue, y: yValue, width: 300, height: 40)) //Note that I have set xValue and yValue
                    sampleTextField.placeholder = "Enter text here"
                    sampleTextField.font = UIFont.systemFont(ofSize: 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 as? UITextFieldDelegate
                    sampleTextField.tag = tagNo  //Note this line for tagNo
                    self.view.addSubview(sampleTextField)
                    textObjects.addObject:sampleTextField //Note this line for adding textfield to array for reference to get total items added

yValue = yValue + sampleTextField.frame.size.height + 20; //Added yValue to place another text view at bottom of initial one and 20px buffer for gap.
                }
            }

打印“数组中的文本对象总数:textObjects.count

如果需要从 View 中获取对象，其 self.view.viewwithTag(tagNo) 将返回精确的文本字段。