import UIKit
import SwiftyDropBox
class NotesViewController: UIViewController,UITableViewDataSource,UITableViewDelegate,NotesviewDelegate {
var userText:[String] = []
@IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
print("View Did Load Notes view controller")
}
override func viewWillAppear(_ animated: Bool) {
print("View will Appear")
self.tabBarController?.navigationItem.title = "Notes"
let sendButton = UIBarButtonItem(title: "New",style: .plain,target: self,action: #selector(goToNoteEditorViewController))
self.tabBarController?.navigationItem.rightBarButtonItem = sendButton
self.automaticallyAdjustsScrollViewInsets = false
}
override func viewDidAppear(_ animated: Bool) {
print("View Did appear Notes view controller")
didDoneButtonpressed()
}
func goToNoteEditorViewController() {
let storyboard = UIStoryboard(name: "Main",bundle: nil)
guard let vc = storyboard.instantiateViewController(withIdentifier:"NoteEditorViewID") as? NoteEditorViewController else{
return
}
vc.delegate = self
self.navigationController?.present(vc,animated: true,completion: nil)
}
public func tableView(_ tableView: UITableView,numberOfRowsInSection section: Int) -> Int{
return userText.count
}
public func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell{
let cell = UITableViewCell(style: UITableViewCellStyle.default,reuseIdentifier: "cell")
cell.textLabel?.text = userText[indexPath.row]
print("The cell is \(cell)")
return (cell)
}
public func tableView(_ tableView: UITableView,didSelectRowAt indexPath: IndexPath){
let controller = UIStoryboard(name: "Main",bundle: nil)
guard let viewController = controller.instantiateViewController(withIdentifier:"TextdisplayID") as? TextdisplayViewController else{
return
}
let indexPath = tableView.indexPathForSelectedRow
let currentCell = tableView.cellForRow(at: indexPath!)!
let text = currentCell.textLabel!.text ?? ""
print(currentCell.textLabel!.text ?? "")
viewController.textTitle = text
navigationController?.pushViewController(viewController,animated: true)
}
func didDoneButtonpressed() {
let userDefaults = UserDefaults()
if let dictionary = userDefaults.dictionary(forKey: "UserNotes"){
if let dictionaryTexts = dictionary as? [String : String] {
userText = [String](dictionaryTexts.keys)
print("array values: \(userText)")
self.tableView.reloadData()
}
}
}
}
在上面的程序中,viewDidAppear在执行时没有调用.任何人都可以解释为什么会发生这种情况？
解决方法
你应该调用super.viewWillAppear和super.viewDidAppear()
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated: animated)
print("View will Appear")
self.tabBarController?.navigationItem.title = "Notes"
let sendButton = UIBarButtonItem(title: "New",action: #selector(goToNoteEditorViewController))
self.tabBarController?.navigationItem.rightBarButtonItem = sendButton
self.automaticallyAdjustsScrollViewInsets = false
}
也
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated: animated)
print("View Did appear Notes view controller")
didDoneButtonpressed()
}
编辑
看来你已经将UITabBarController子类化了.在你的TabBarController中,你需要调用super.viewWillAppear()和super.viewDidAppear
class YourCustomTabBarController : UITabBarController {
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
}
override func viewWilldisappear(_ animated: Bool) {
super.viewWilldisappear(animated)
}
}