CODEWITHSUNDEEP
iosswift3
tim
tim

Reputation: 173

Reusing UITableViewCell

I am trying to reuse my UITableViewCells. At the moment my app works fine, displaying the content in tableView. However when I try and implement - reusing UITableViewCells, my app crashes. I have noted down the error below. Please can someone advise?

 // This code works
 let cell = UITableViewCell.init(style: .subtitle, reuseIdentifier: "UITableViewCell")

 // However, When I replace it with the following my app crashes.
 let cell = self.tableView.dequeueReusableCell(withIdentifier: "UITableViewCell", for: indexPath)

The error in the console:

2017-05-27 12:35:40.623 lifesci-PubMed[86784:9245533] *** Assertion failure in -[UITableView dequeueReusableCellWithIdentifier:forIndexPath:],     /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-     3600.6.21/UITableView.m:6600
2017-05-27 12:35:40.639 lifesci-PubMed[86784:9245533] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'unable to dequeue a cell with identifier UITableViewCell - must register a nib or a class for the identifier or connect a prototype cell in a storyboard'
*** First throw call stack:
(
0   CoreFoundation                      0x000000010e56ed4b __exceptionPreprocess + 171
1   libobjc.A.dylib                     0x000000010dfd021e objc_exception_throw + 48
2   CoreFoundation                      0x000000010e572e42 +[NSException raise:format:arguments:] + 98
3   Foundation                          0x000000010db6566d -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 195
4   UIKit                               0x000000010eaed1e8 -[UITableView dequeueReusableCellWithIdentifier:forIndexPath:] + 259
5   lifesci-PubMed                      0x000000010d99ae04 _TFC14lifesci_PubMed27MySearchTableViewController9tableViewfTCSo11UITableView12cellForRowAtV10Foundation9IndexPath_CSo15UITableViewCell + 276
6   lifesci-PubMed                      0x000000010d99b297 _TToFC14lifesci_PubMed27MySearchTableViewController9tableViewfTCSo11UITableView12cellForRowAtV10Foundation9IndexPath_CSo15UITableViewCell + 87
7   UIKit                               0x000000010eb00584 -[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 757
8   UIKit                               0x000000010eb007e2 -[UITableView _createPreparedCellForGlobalRow:willDisplay:] + 74
9   UIKit                               0x000000010ead42b0 -[UITableView _updateVisibleCellsNow:isRecursive:] + 3295
10  UIKit                               0x000000010eb09b64 -[UITableView _performWithCachedTraitCollection:] + 110
11  UIKit                               0x000000010eaf03be -[UITableView layoutSubviews] + 222
12  UIKit                               0x000000010ea57ab8 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1237
13  QuartzCore                          0x0000000113b03bf8 -[CALayer layoutSublayers] + 146
14  QuartzCore                          0x0000000113af7440 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366
15  QuartzCore                          0x0000000113af72be _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
16  QuartzCore                          0x0000000113a85318 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 280
17  QuartzCore                          0x0000000113ab23ff _ZN2CA11Transaction6commitEv + 475
18  QuartzCore                          0x0000000113ab2d6f _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 113
19  CoreFoundation                      0x000000010e513267 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
20  CoreFoundation                      0x000000010e5131d7 __CFRunLoopDoObservers + 391
21  CoreFoundation                      0x000000010e4f7f8e __CFRunLoopRun + 1198
22  CoreFoundation                      0x000000010e4f7884 CFRunLoopRunSpecific + 420
23  GraphicsServices                    0x0000000112bfda6f GSEventRunModal + 161
24  UIKit                               0x000000010e992c68 UIApplicationMain + 159
25  lifesci-PubMed                      0x000000010d9b579f main + 111
26  libdyld.dylib                       0x0000000111c6d68d start + 1
27  ???                                 0x0000000000000001 0x0 + 1
 )
 libc++abi.dylib: terminating with uncaught exception of type NSException

Upvotes: 0

Views: 94

Answers (3)

Manoj Karki
Manoj Karki

Reputation: 270

if you have created tableview cell nib when adding UITableViewCell subclass then you should register nib instead of class. Just do,

tableView.register(UINib.init(nibName: "nibname", bundle: nil), forCellReuseIdentifier: "identifier")

Upvotes: 0

Nirav D
Nirav D

Reputation: 72460

If you want to reuse the cell in cellForRowAt then you need to first register the cell to tableView with reuseIdentifier. So register the UITableViewCell class to tableView.

override func viewDidLoad() {
    super.viewDidLoad()
    self.tableView.register(UITableViewCell.self, forCellReuseIdentifier: "UITableViewCell")
}

Upvotes: 1

hament miglani
hament miglani

Reputation: 191

U have to register cell to your class before use in cellForRow like that 

 [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"YourReuseIdentifier"];

in your viewDidLoad method!

Upvotes: 0

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