CODEWITHSUNDEEP
iosswift
tim
tim

Reputation: 173

UITableView using UIViewController not loading tableView

I have the following layout whereby I have my searchbar at the top and does not scroll with tableView. I have wired up the datasource and delegate for UITableView with my custom UIViewControler but I am not getting my tableview populated but instead I am getting the error below. Please can someone advise?

My Layout:

enter image description here

enter image description here

TestTableViewController - inspecter:enter image description here

TestTableViewController:

 class TestTableViewController: UIViewController, UITableViewDelegate, UISearchBarDelegate{


@IBOutlet var myTableView: UITableView!
var itemstore: ItemStore!

override func viewDidLoad() {
    super.viewDidLoad()


}


func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    print("numberOfRowsSection ...")
    return itemstore.allItems.count
}



func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    print("cellForRow ...")
    // Get a new or recycled cell
    let cell = UITableViewCell(style: .value1, reuseIdentifier: "UITableViewCell")
    let name = itemstore.allItems[indexPath.row]
    cell.textLabel?.text = name

    return cell
}

ItemStore:

 import UIKit

 class ItemStore {

var allItems = ["Thanh", "David", "Tommy", "Maria"]


 }

AppDelegate:

  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    // Create ItemStore instance
    let itemStoreObject = ItemStore()
    let itemController = window!.rootViewController as! TestTableViewController
    itemController.itemstore = itemStoreObject

    return true
}

I am getting the following error:

 2017-06-16 21:30:33.046 TestTableViewSearch[15419:1672786] *** Assertion 
 failure in -[UITableView _configureCellForDisplay:forIndexPath:], 
 /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-
 3600.6.21/UITableView.m:8042
 2017-06-16 21:30:33.052 TestTableViewSearch[15419:1672786] *** Terminating 
 app due to uncaught exception 'NSInternalInconsistencyException', reason: 
 'UITableView (<UITableView: 0x7fa6e3817a00; frame = (0 64; 375 603); 
 clipsToBounds = YES; autoresize = RM+BM; gestureRecognizers = <NSArray: 
 0x600000058f60>; layer = <CALayer: 0x600000025680>; contentOffset: {0, 0}; 
 contentSize: {375, 176}>) failed to obtain a cell from its dataSource 
 (<TestTableViewSearch.TestTableViewController: 0x7fa6e2406df0>)'
 *** First throw call stack:
 (
0   CoreFoundation                      0x0000000110c39d4b __exceptionPreprocess + 171
1   libobjc.A.dylib                     0x000000010df4c21e objc_exception_throw + 48
2   CoreFoundation                      0x0000000110c3de42 +[NSException raise:format:arguments:] + 98
3   Foundation                          0x000000010dae166d -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 195
4   UIKit                               0x000000010e57d9cd -[UITableView _configureCellForDisplay:forIndexPath:] + 222
5   UIKit                               0x000000010e5895eb -[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 860
6   UIKit                               0x000000010e5897e2 -[UITableView _createPreparedCellForGlobalRow:willDisplay:] + 74
7   UIKit                               0x000000010e55d2b0 -[UITableView _updateVisibleCellsNow:isRecursive:] + 3295
8   UIKit                               0x000000010e592b64 -[UITableView _performWithCachedTraitCollection:] + 110
9   UIKit                               0x000000010e5793be -[UITableView layoutSubviews] + 222
10  UIKit                               0x000000010e4e0ab8 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1237
11  QuartzCore                          0x0000000113a7fbf8 -[CALayer layoutSublayers] + 146
12  QuartzCore                          0x0000000113a73440 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366
13  QuartzCore                          0x0000000113a732be _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
14  QuartzCore                          0x0000000113a01318 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 280
15  QuartzCore                          0x0000000113a2e3ff _ZN2CA11Transaction6commitEv + 475
16  QuartzCore                          0x0000000113a2ed6f _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 113
17  CoreFoundation                      0x0000000110bde267 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
18  CoreFoundation                      0x0000000110bde1d7 __CFRunLoopDoObservers + 391
19  CoreFoundation                      0x0000000110bc28a6 CFRunLoopRunSpecific + 454
20  UIKit                               0x000000010e415aea -[UIApplication _run] + 434
21  UIKit                               0x000000010e41bc68 UIApplicationMain + 159
22  TestTableViewSearch                 0x000000010d96299f main + 111
23  libdyld.dylib                       0x0000000111be968d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

Upvotes: 1

Views: 196

Answers (3)

tek3
tek3

Reputation: 2115

The error message

failed to obtain a cell from its dataSource

means that your code is not handling UITableViewDataSource properly. It might be due to UITableViewDataSource not implemented correctly or there might be some error in assigning the datasource and delegate properties in the xib.

Mistake :

I notice that your class TestTableViewController, does not conform to protocol UITableViewDataSource

So make your class TestTableViewController conform to protocol UITableViewDataSource like so :

class TestTableViewController: UIViewController, UITableViewDelegate, UISearchBarDelegate , UITableViewDataSource

and define UITableViewDataSource methods in TestTableViewController.

Upvotes: 2

Jota
Jota

Reputation: 149

We can see in the stack trace the actual error:

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UITableView (...) failed to obtain a cell from its dataSource (<TestTableViewSearch.TestTableViewController: 0x7fa6e2406df0>)'"

That means that your cellForRowAtIndexPath method returned a nil cell. You need to specify a reuse identifier for the cell in the Storyboard and init it like this:

let cell = tableView.dequeueReusableCell(withReuseIdentifier: "YourReuseIdentifier", for: indexPath)

Also in the stack trace we can see that the data source is actually correct:

(...) dataSource  (<TestTableViewSearch.TestTableViewController: 0x7fa6e2406df0>)'"

So you only need to return a valid cell and it should work.

Upvotes: 0

DonMag
DonMag

Reputation: 77476

The error message shows:

failed to obtain a cell from its dataSource

Your view controller is:

class TestTableViewController: UIViewController, UITableViewDelegate, UISearchBarDelegate{

Which appears to be missing UITableViewDataSource

Upvotes: 2

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