[英]Deleting a tableView cell SWIFT
How can I delete a table view cell with Swift? 如何使用Swift删除表格视图单元格? I am using parse also.
我也在使用解析。 It would be great if someone can tell me how to make an action sheet asking, "Are you sure you want to delete?"
如果有人可以告诉我如何制作一个操作表,问“您确定要删除吗?”,那将是很好的。 If not that's okay.
如果没有,那没关系。
Here is the code I have so far: 这是我到目前为止的代码:
import UIKit
class MasterTableViewController: UITableViewController, UITableViewDelegate,
PFLogInViewControllerDelegate, PFSignUpViewControllerDelegate {
var noteObjects: NSMutableArray! = NSMutableArray()
override func viewDidLoad() {
super.viewDidLoad()
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem()
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
if (PFUser.currentUser() == nil) {
}else {
self.fetchAllObjectsFromLocalDatastore()
self.fetchAllObjects()
}
}
func fetchAllObjectsFromLocalDatastore() {
var query: PFQuery = PFQuery(className: "Note")
query.fromLocalDatastore()
query.whereKey("username", equalTo: PFUser.currentUser()!.username!)
query.findObjectsInBackgroundWithBlock { (objects, error) -> Void in
if (error == nil) {
var temp: NSArray = objects!; NSArray.self
self.noteObjects = temp.mutableCopy() as! NSMutableArray
self.tableView.reloadData()
}else {
}
}
}
func fetchAllObjects() {
PFObject.unpinAllObjectsInBackgroundWithBlock(nil)
var query: PFQuery = PFQuery(className: "Note")
query.whereKey("username", equalTo: PFUser.currentUser()!.username!)
query.findObjectsInBackgroundWithBlock { (objects, error) -> Void in
if (error == nil) {
PFObject.pinAllInBackground(objects, block: { (success, error) in
if error == nil {
self.fetchAllObjectsFromLocalDatastore()
}
})
}else {
println(error!.userInfo)
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Potentially incomplete method implementation.
// Return the number of sections.
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete method implementation.
// Return the number of rows in the section.
return self.noteObjects.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = self.tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! MasterTableViewCell
var object: PFObject = self.noteObjects.objectAtIndex(indexPath.row) as! PFObject
cell.masterTitleLabel?.text = object["title"] as? String
cell.masterTextLabel?.text = object["text"] as? String
return cell
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
self.performSegueWithIdentifier("editNote", sender: self)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
var upcoming: AddNoteTableViewController = segue.destinationViewController as! AddNoteTableViewController
if (segue.identifier == "editNote") {
let indexPath = self.tableView.indexPathForSelectedRow()!
var object: PFObject = self.noteObjects.objectAtIndex(indexPath.row) as! PFObject
upcoming.object = object
self.tableView.deselectRowAtIndexPath(indexPath, animated: true)
}
}
}
Implement commitEditingStyle
method of tableview : 实现tableview的
commitEditingStyle
方法:
override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == .Delete {
let alert = UIAlertController(title: "Delete Note", message: "Are you sure you want to delete this note?", preferredStyle: .ActionSheet)
alert.addAction(UIAlertAction(title: "Yes", style: .Destructive, handler: {
(alert:UIAlertAction!) in
//****//
your code to delete item from parse.
// ***//
//And then remove object from tableview
self.noteObjects.removeAtIndex(indexPath.row)
self.tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)
}))
alert.addAction(UIAlertAction(title: "No", style: .Cancel, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
}
}
Delete
button will be visible on swiping left specific table cell Hope this will help! 在向左滑动特定表格单元格时将显示“
Delete
按钮希望这会有所帮助!
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