【发布时间】：2020-01-31 17:05:40
【问题描述】：
我正在尝试在 PopupViewController 中单击按钮，用字符串“svimmelhed”填充 DagbogsindlaegViewController 中的文本字段。
运行代码时我没有收到任何错误，但是当我运行应用程序模拟并在 PopupViewController 类中按“ButtonPressSvimmelhed”时，文本不存在。 有没有好心的陌生人可以帮助我并告诉我我做错了什么？
代码如下：
import UIKit
import EventKit
class DagbogsindlaegViewController: UIViewController{
@IBAction func BackToSVC(_ sender: Any){
self.performSegue(withIdentifier: "BackToSVCSegue", sender: self)
}
@IBAction func ToCalenderButtonPress(_ sender: Any) {
self.performSegue(withIdentifier: "ToCalenderSegue", sender: self)
}
override func viewDidLoad() {
super.viewDidLoad()
TitleTextField.delegate = self
DescriptionTextField.delegate = self
// Do any additional setup after loading the view.
}
@IBOutlet weak var TitleTextField: UITextField!
@IBOutlet weak var DescriptionTextField: UITextField!
func addEventToCalendar(title: String, description: String?, startDate: Date, endDate: Date, completion: ((_ success: Bool, _ error: NSError?) -> Void)? = nil) {
let eventStore = EKEventStore()
eventStore.requestAccess(to: .event, completion: { (granted, error) in
if (granted) && (error == nil) {
let event = EKEvent(eventStore: eventStore)
event.title = title
event.startDate = startDate
event.endDate = endDate
event.notes = description
event.calendar = eventStore.defaultCalendarForNewEvents
do {
try eventStore.save(event, span: .thisEvent)
} catch let e as NSError {
completion?(false, e)
return
}
completion?(true, nil)
} else {
completion?(false, error as NSError?)
}
})
}
@IBAction func ButtonPressGemDagbog(_ sender: Any) {
addEventToCalendar(title: "\(String(describing: TitleTextField.text!))", description: "\(String(describing: DescriptionTextField.text!))", startDate: NSDate() as Date, endDate: NSDate() as Date)
}
@IBAction func ButtonPressPopupMenu(_ sender: Any) {
let popOverVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "PopupViewControllerID") as! PopupViewController
self.addChild(popOverVC)
popOverVC.view.frame = self.view.frame
self.view.addSubview(popOverVC.view)
popOverVC.didMove(toParent: self)
}
}
extension DagbogsindlaegViewController : UITextFieldDelegate {
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
}
extension DagbogsindlaegViewController : TextFraPopupDelegate {
func Symptomer(Svimmelhed: String) {
TitleTextField.text = Svimmelhed
}
}
还有另一个视图控制器：
import UIKit
protocol TextFraPopupDelegate{
func Symptomer(Svimmelhed: String)
}
class PopupViewController: UIViewController {
var symptomDelegate: TextFraPopupDelegate?
override func viewDidLoad() {
super.viewDidLoad()
self.showAnimate()
self.view.backgroundColor = UIColor.black.withAlphaComponent(0.8)
// Do any additional setup after loading the view.
}
@IBAction func ButtonPressBackToDagbogsindlaeg(_ sender: Any) {
self.removeAnimate()
//self.view.removeFromSuperview()
}
func showAnimate()
{
self.view.transform = CGAffineTransform(scaleX: 1.3, y: 1.3)
self.view.alpha = 0.0;
UIView.animate(withDuration: 0.25, animations: {
self.view.alpha = 1.0
self.view.transform = CGAffineTransform(scaleX: 1.0, y: 1.0)
});
}
func removeAnimate()
{
UIView.animate(withDuration: 0.25, animations: {
self.view.transform = CGAffineTransform(scaleX: 1.3, y: 1.3)
self.view.alpha = 0.0;
}, completion:{(finished : Bool) in
if (finished)
{
self.view.removeFromSuperview()
}
});
}
@IBAction func ButtonPressSvimmelhed(_ sender: UIButton) {
if sender.isSelected {
sender.isSelected = false
} else {
sender.isSelected = true
}
symptomDelegate?.Symptomer(Svimmelhed: "Svimmelhed, ")
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
}
}
【问题讨论】：
-
你设置了代理吗？您可能需要在 ButtonPressPopupMenu 中使用 popOverVC.delegate = self。
-
我认为 john elemans 可能是对的。您可以通过在
ButtonPressSvimmelhed中设置断点来检查symptomDelegate是否为nil。