我正在使用 coredata 保存字符串，并且我保存的所有字符串将在表格 View 中显示为标签文本。字符串来自警报 View 中的文本字段。它正确保存了字符串，但我必须关闭并再次运行项目，然后新字符串才会显示在表格 View 中。
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet var tableView: UITableView!
var buyingList : [BuyList] = []
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
gettingData()
self.tableView.dataSource = self
self.tableView.delegate = self
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.buyingList.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
// let Cell = tableView.dequeueReusableCellWithIdentifier("identifier") as UITableViewCell!
let Cell = UITableViewCell()
let tableViewData = self.buyingList.reverse()[indexPath.row]
Cell.textLabel?.text = tableViewData.buyList
return Cell
}
func refresh(){
dispatch_async(dispatch_get_main_queue()) { () -> Void in
dump(self.buyingList)
self.tableView.reloadData()
}
}
@IBAction func addButton(sender: UIBarButtonItem) {
nameOfPicture()
}
func nameOfPicture() {
let alert = UIAlertController(title: "Tilføj", message: "", preferredStyle: UIAlertControllerStyle.Alert)
let cancel = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: nil)
alert.addAction(cancel)
alert.addTextFieldWithConfigurationHandler { (textField) -> Void in
}
alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: { (action) -> Void in
let context = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
let savingData = NSEntityDescription.insertNewObjectForEntityForName("BuyList", inManagedObjectContext: context) as! BuyList
let textf = alert.textFields![0] as UITextField
savingData.buyList = textf.text
do {
try context.save()
} catch _ {
}
}))
self.presentViewController(alert, animated: true, completion: nil)
}
func gettingData() {
let context = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
let request = NSFetchRequest(entityName: "BuyList")
var results : [AnyObject]?
do {
results = try context.executeFetchRequest(request)
} catch _ {
results = nil
}
if results != nil {
self.buyingList = results! as! [BuyList]
}
}
}
最佳答案
获取数据后，表格 View 不会重新加载。您的获取数据函数应如下所示:
if results != nil {
self.buyingList = results! as! [BuyList]
self.tableView.reloadData()
}
如果此调用后没有在您的表中显示数据，则意味着您的结果因此您的购买列表为空
关于swift - 添加对象后更新表格 View ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38132369/