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  • [Swift]iOS开发之初识CoreData

    这是一个HitList

    import UIKit
    import CoreData
    
    class ViewController: UIViewController,UITableViewDataSource {
    
        var names = [String]()
        var people = [NSManagedObject]()
        
        @IBOutlet weak var tableView: UITableView!
        
        override func viewWillAppear(animated: Bool) {
            super.viewWillAppear(animated)
            
            let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
            
            let managedContext = appDelegate.managedObjectContext
            let fetchRequest = NSFetchRequest(entityName: "Person")
            
            do {
                let results = try managedContext.executeFetchRequest(fetchRequest)
                people = results as! [NSManagedObject]
            } catch let error as NSError {
                print("Could not fetch (error),(error.userInfo)")
            }
        }
        
        override func viewDidLoad() {
            super.viewDidLoad()
            // Do any additional setup after loading the view, typically from a nib.
            
            title = ""The List""
    //        tableView.registerClass(UITableView.self, forCellReuseIdentifier: "Cell")
        }
        
        @IBAction func addName(sender: AnyObject) {
            
            var alert = UIAlertController(title: "New name", message: "Add a new name", preferredStyle: .Alert)
            
            let saveAction = UIAlertAction(title: "Save", style: .Default) { (action: UIAlertAction!) -> Void in
                
                let textField = alert.textFields!.first
                self.saveName(textField!.text!)
                self.tableView.reloadData()
            }
            
            let cancelAction = UIAlertAction(title: "Cancel", style: .Default) { (action: UIAlertAction!) -> Void in
                
            }
            
            alert.addTextFieldWithConfigurationHandler { (textField: UITextField!) -> Void in
                
            }
            
            alert.addAction(saveAction)
            alert.addAction(cancelAction)
            
            presentViewController(alert, animated: true, completion: nil)
        }
        
        func saveName(name: String) {
            let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
            let managedContext = appDelegate.managedObjectContext
            
            let entity = NSEntityDescription.entityForName("Person", inManagedObjectContext: managedContext)
            
            let person = NSManagedObject(entity: entity!, insertIntoManagedObjectContext: managedContext)
            
            person.setValue(name, forKey: "name")
            
            do {
                try managedContext.save()
                people.append(person)
            } catch let error as NSError {
                print("Could not save(error),(error.userInfo)")
            }
        }
        
        func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
            return people.count
        }
        
        func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
            
            let cell = tableView.dequeueReusableCellWithIdentifier("Cell")! as UITableViewCell
            
            let person = people[indexPath.row]
            cell.textLabel?.text = person.valueForKey("name") as! String?
            
            return cell
        }
    
        override func didReceiveMemoryWarning() {
            super.didReceiveMemoryWarning()
            // Dispose of any resources that can be recreated.
        }
    
    
    }
    
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  • 原文地址:https://www.cnblogs.com/ybw123321/p/5268947.html
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