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我正在製作一個雞尾酒iOS應用程序。iOS中的更新表視圖（Swift）
我將字符串添加到tableview（「內閣」的一種成分）。用戶輸入一種成分，然後按下ADD按鈕。它成功地將其添加到核心數據中，但它不會立即顯示。我究竟做錯了什麼？
以下是我的代碼，謝謝！
的ViewController：
import UIKit
import CoreData
class CabinetViewController: UIViewController, UITextFieldDelegate, UITableViewDataSource, UITableViewDelegate {
var ingredientArray = [String]()
var display = [String]()
var dbIngredients = [String]()
let ingredientFetch = NSFetchRequest(entityName: "Cabinet")
var fetchedIngredient = [Cabinet]()
@IBOutlet weak var TextUI: UITextField!
@IBOutlet weak var Button: UIButton!
@IBOutlet weak var TableView: UITableView!
let moc = DataController().managedObjectContext
override func viewDidLoad() {
super.viewDidLoad()
TextUI.delegate = self
TextUI.addTarget(self, action: "textFieldDidChange:", forControlEvents: UIControlEvents.EditingChanged)
TableView.delegate = self
TableView.dataSource = self
TableView.registerClass(UITableViewCell.self,
forCellReuseIdentifier: "Cell")
// fetch Core Data
do{
fetchedIngredient = try moc.executeFetchRequest(ingredientFetch) as! [Cabinet]
} catch {
fatalError()
}
let postEndpoint: String = "http://www.thecocktaildb.com/api/json/v1/1/list.php?i=list"
guard let url = NSURL(string: postEndpoint) else {
print("Error: cannot create URL")
return
}
let urlRequest = NSURLRequest(URL: url)
let config = NSURLSessionConfiguration.defaultSessionConfiguration()
let session = NSURLSession(configuration: config)
let task = session.dataTaskWithRequest(urlRequest, completionHandler: { (data, response, error) in
guard let responseData = data else {
print("Error: did not receive data")
return
}
guard error == nil else {
print("error calling GET on www.thecocktaildb.com")
print(error)
return
}
let post: NSDictionary
do {
post = try NSJSONSerialization.JSONObjectWithData(responseData,
options: []) as! NSDictionary
} catch {
print("error trying to convert data to JSON")
return
}
var count = 1
if let drinks = post["drinks"] as? [NSDictionary] {
for drink in drinks {
if let strIngredient = drink["strIngredient1"] as? String {
print(String(count) + ". " + strIngredient)
self.dbIngredients.append(strIngredient)
count++
}
}
}
})
task.resume()
TableView.reloadData()
}
func textFieldDidChange(textField: UITextField) {
search(self.TextUI.text!)
}
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
Button.addTarget(self, action: "buttonPressed:", forControlEvents: .TouchUpInside)
return true
}
func buttonPressed(sender: UIButton!) {
//ingredientArray.append(TextUI.text!)
let entity = NSEntityDescription.insertNewObjectForEntityForName("Cabinet", inManagedObjectContext: moc) as! Cabinet
entity.setValue(TextUI.text!, forKey: "ingredient")
do{
try moc.save()
}catch {
fatalError("failure to save context: \(error)")
}
showAlertButtonTapped(Button)
// dispatch_async(dispatch_get_main_queue(), {() -> Void in
// self.TableView.reloadData()
// })
}
@IBAction func showAlertButtonTapped(sender: UIButton) {
// create the alert
let alert = UIAlertController(title: "Added!", message: "You've added " + TextUI.text! + " to your cabinet", preferredStyle: UIAlertControllerStyle.Alert)
// add an action (button)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
// show the alert
self.presentViewController(alert, animated: true, completion: nil)
}
func search(str:String) {
display.removeAll(keepCapacity: false)
for s in dbIngredients{
if s.hasPrefix(str){
display.append(s)
print(s)
}
}
}
func tableView(tableView: UITableView,
numberOfRowsInSection section: Int) -> Int {
return fetchedIngredient.capacity
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath)
do{
let fetchedIngredient = try moc.executeFetchRequest(ingredientFetch) as! [Cabinet]
cell.textLabel?.text = fetchedIngredient[indexPath.row].ingredient
} catch {
fatalError("bad things happened: \(error)")
}
return cell
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
tableView.deselectRowAtIndexPath(indexPath, animated: true)
let alert = UIAlertController(title: "Remove " + fetchedIngredient[indexPath.row].ingredient!,
message: "No more " + fetchedIngredient[indexPath.row].ingredient! + " in your cabinet?",
preferredStyle: .Alert)
let deleteAction = UIAlertAction(title: "Remove",
style: .Default,
handler: { (action:UIAlertAction) -> Void in
self.fetchedIngredient.removeAtIndex(indexPath.row)
do{
let fetchedResults = try self.moc.executeFetchRequest(self.ingredientFetch)
if let result = fetchedResults[indexPath.row] as? NSManagedObject {
self.moc.deleteObject(result)
try self.moc.save()
}
}catch{
fatalError()
}
})
let cancelAction = UIAlertAction(title: "Cancel",
style: .Default) { (action: UIAlertAction) -> Void in
}
alert.addAction(cancelAction)
alert.addAction(deleteAction)
presentViewController(alert,
animated: true,
completion: nil)
TableView.reloadData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
後，調用tableView.reloadData（） – AMayes