如何将数据传回给ViewController，持有容器中嵌入的Container View和TableViewController？ Swift 3
问题描述：
如何在nextButton被点击时调用func checkField？ 如果在ManagedTableEleventhViewController中没有字段为空，我想继续使用TwelvethViewController。如何将数据传回给ViewController，持有容器中嵌入的Container View和TableViewController？ Swift 3
我有一个UIViewController ElevethViewController它拥有一个容器视图。容器视图具有嵌入到UITableViewController ManagedTableEleventhViewController的segue。从ElevethViewController有一个显示SEGUE到一个UIViewController TwelevethViewController
视图层次是这样的：
ElevethViewController
Container View
ManagedTableEleventhViewController embedded in Container View with Embed segue
Show segue "eleventhToTwelveth" to "Tweleveth View Controller"
Embed segue "myEmbeddedSegue" to "Managed Table"
ManagedTableEleventhViewController包括含有各1个文本框和一个空的静态小区4个静态细胞。
import UIKit
import Foundation
protocol DelegateEleventh {
func checkField(sender:EleventhViewController)
}
class EleventhViewController: UIViewController {
var delegate:DelegateEleventh?
@IBAction func nextButton(_ sender: Any) {
//if delegate is not nil, call func checkField
if let delegateVC = delegate {
delegateVC.checkField(sender:self)
} else{
print("delegateVC value \(delegate)") //prints nil
}
}
} //end of class
import Foundation
import UIKit
class ManagedTableEleventhViewController:
UITableViewController,UITextFieldDelegate,DelegateEleventh {
@IBOutlet weak var fullName: UITextField!
@IBOutlet weak var flatNumber: UITextField!
@IBOutlet weak var streetAddress: UITextField!
@IBOutlet weak var phoneNumber: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
}
//When nextButton is touched in EleventhViewController, call this method
func checkField(sender:EleventhViewController){
for cell in self.tableView.visibleCells {
for sub in cell.contentView.subviews{
if sub is UITextField{
let textF = sub as? UITextField
//if textField is empty, make its border red,else clear
if textF?.text == "" {
self.hasText = false
textF?.layer.cornerRadius = 8.0
textF?.layer.masksToBounds = true
textF?.layer.borderColor = UIColor.red.cgColor
textF?.layer.borderWidth = 1.0
} else {
self.hasText = true
//segue to nextViewcontroller
sender.performSegue(withIdentifier: "elevethToTwelveth", sender: sender)
}
}// end of if sub is UITextField
}//end of for sub in cell.contentView
} //end of for cell in tableView
}
//KEYBOARD DOES NOT RESIGN....
// When tapping outside of the keyboard, close the keyboard down
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
self.view.endEditing(true)
}
// used to check textField has a string value
var hasText:Bool!
//called by ManagedTableEleventhViewController (namely the delegate) when
editing has begun
func textFieldDidBeginEditing(_ textField: UITextField) {
if textField.text == "" {
print("false value in textFieldDidBeginEditing")
self.hasText = false
textField.layer.cornerRadius = 8.0
textField.layer.masksToBounds = true
textField.layer.borderColor = UIColor.red.cgColor
textField.layer.borderWidth = 1.0
} else {
print("true value in textFieldDidBeginEditing")
textField.layer.borderWidth = 1
textField.layer.borderColor = UIColor.white.cgColor
print("call in else")
self.hasText = true
}
}
//called by ManagedTableEleventhViewController (namely the delegate) when
// editing stopped
func textFieldDidEndEditing(_ textField: UITextField, reason: UITextFieldDidEndEditingReason) {
//if textField is empty make the border red
if textField.text == "" {
self.hasText = false
textField.layer.cornerRadius = 8.0
textField.layer.masksToBounds = true
textField.layer.borderColor = UIColor.red.cgColor
textField.layer.borderWidth = 1.0
print("false value in textFieldDidEndEditing")
} else {
textField.layer.borderWidth = 1
textField.layer.borderColor = UIColor.white.cgColor
print("true value in textFieldDidEndEditing")
self.hasText = true
}
}
// Stop Editing on Return Key Tap.
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
}//end of class
答
由于this answer我已获得所期望的结果。
class EleventhViewController: UIViewController {
@IBAction func nextButton(_ sender: Any) {
var managed: ManagedTable? {
return self.childViewControllers.last as! ManagedTable?
//if there is no empty field after checkField(sender:_) is called,
// segue to TwelvethViewController
managed?.checkField(sender: self)
}
}
}
class ManagedTableEleventhViewController {
// holds a true value if textField contains a value
var hasText:Bool!
//holds a true/false value for each textField after iterating through them
//with a for loop
var textValues = [Bool]()
//When nextButton is touched in EleventhViewController, call this method
func checkField(sender:EleventhViewController) {
for cell in self.tableView.visibleCells{
for sub in cell.contentView.subviews{
if sub is UITextField{
let textF = sub as? UITextField
//if textField is empty, make its border red,else clear
if textF?.text == "" {
self.hasText = false
self.textValues.append(self.hasText)
textF?.layer.cornerRadius = 8.0
textF?.layer.masksToBounds = true
textF?.layer.borderColor = UIColor.red.cgColor
textF?.layer.borderWidth = 1.0
} else {
self.hasText = true
self.textValues.append(self.hasText)
}
}// end of if sub is UITextField
}//end of for sub in cell.contentView
} //end of for cell in tableView
//if no field is empty perform segue to TwelvethViewController,
//otherwise reset textValues array
if !self.textValues.contains(false){
sender.performSegue(withIdentifier: "eleventhToTwelveth", sender: sender)
}
self.textValues.removeAll()
} //end of checkField(sender:_)
}//end of class
看起来像'IBOutlet'' fullName'，其他的没有在Interface Builder中连接（如调试变量列表中所述）。顺便说一句：你为什么使用'var'作为常量？你不会得到一堆警告吗？ – vadian
@vadian现在我已经为UserDefaults常量创建了键。如果您查看Connections检查器中的第一个屏幕截图，您将看到fullName在Interface Builder中连接。 – bibscy
它不是，因为使用默认初始化程序'ManagedTableEleventhViewController（）'创建的实例不是** Interface Builder中的实例。您需要从赛格实际参考控制器。 – vadian