ios - 如何按日期从核心数据中获取数据作为一个部分？
<p><pre><code> fetchedResultsController = NSFetchedResultsController(fetchRequest: request, managedObjectContext: moc, sectionNameKeyPath:"time", cacheName: nil)
</code></pre>
<p><strong>我正在使用此代码，其中 time 是存储 Date() 对象的列名。</strong></p>
<p>我想获取基于日期的部分
比如……</p>
<blockquote>
<p>29-11-2016 total row = 3</p>
<p>28-11-2016 total row = 1</p>
<p>but currently getting separate section for each time difference on
same date.</p>
</blockquote>
<p><strong>那么，我如何使用获取请求 Controller 来实现这一点。 ????</strong></p>
<p>提前致谢。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>这个问题已经解决了堆栈溢出问题。它会工作，请检查它。</p>
<pre><code>import UIKit
import CoreData
class ExampleViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, NSFetchedResultsControllerDelegate {
@IBOutlet weak var tableView: UITableView!
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let managedObjectContext = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext!
var fetchedResultController: NSFetchedResultsController = NSFetchedResultsController()
var orders = ()
var startDate : NSDate = NSDate()
var endDate : NSDate = NSDate()
override func viewDidLoad() {
super.viewDidLoad()
fetchedResultController.delegate = self
tableView.dataSource = self
tableView.delegate = self
fetchData()
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return fetchedResultController.fetchedObjects!.count
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
let order = fetchedResultController.fetchedObjects! as! Order
return ((order.products?.count ?? 0) + (order.services?.count ?? 0))
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let textCellIdentifier = "ExampleTableViewCell"
let row = indexPath.row
let cell = tableView.dequeueReusableCellWithIdentifier(textCellIdentifier, forIndexPath: indexPath) as! ExampleTableViewCell
let order = fetchedResultController.fetchedObjects! as! Order // Data fetched using NSFetchedResultsController
let products = (order.products?.allObjects ?? ()) as! // Swift Array
let services = (order.services?.allObjects ?? ()) as! // Swift Array
if (row < products.count) { // this is a Product row
cell.orderLabel.text = products.name!
} else { // this is a Service row
cell.orderLabel.text = services.name!
}
return cell
}
func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
let order = fetchedResultController.fetchedObjects! as! Order
return "\(order.date)"
}
func orderFetchRequest() -> NSFetchRequest {
let fetchRequest = NSFetchRequest(entityName: "Order")
let sortDescriptor = NSSortDescriptor(key: "date", ascending: true)
let predicate = NSPredicate(format: "date >= %@ AND date <= %@", startDate, endDate) // startDate and endData are defined elsewhere
fetchRequest.sortDescriptors =
fetchRequest.predicate = predicate
return fetchRequest
}
func fetchData() {
let fetchRequest = orderFetchRequest()
fetchedResultController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: managedObjectContext, sectionNameKeyPath:nil, cacheName: nil)
do {
try fetchedResultController.performFetch()
}
catch let error as NSError {
print("Could not fetch \(error), \(error.userInfo)")
}
}
}
</code></pre>
<p>我只是复制并粘贴它。希望它对你有用。如果没有，我会帮你的。</p></p>
<p style="font-size: 20px;">关于ios - 如何按日期从核心数据中获取数据作为一个部分？，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/40863588/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/40863588/
</a>
</p>
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