我使用AFNetworking 3在json中下载了我的Firebase数据库。一切正常,但函数cellForRoAtIndexPath出现崩溃。 由于下载JSON异步崩溃
工作:
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
[manager GET:@"https://jojol-concours-lists.firebaseio.com/.json" parameters:URLParameters progress:nil success:^(NSURLSessionTask *task, id responseObject) {
self.contestArray = responseObject;
[_collectionView reloadData];
} failure:^(NSURLSessionTask *operation, NSError *error) {
NSLog(@"Error: %@", error);
}];
工作:
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return [self.contestArray count];
}
不起作用:(*的NSDictionary阵列= [self.contestArray objectAtIndex:indexPath.row])
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
cellForItemAtIndexPath:(NSIndexPath *)indexPath {
DemoCollectionViewCell *retVal = [collectionView dequeueReusableCellWithReuseIdentifier:@"collectionViewCell"
forIndexPath:indexPath];
//////// Not work ///////
NSDictionary *array = [self.contestArray objectAtIndex:indexPath.row];
//////// Not work ///////
retVal.name.text = @"";
retVal.contentView.layer.cornerRadius = 10;
retVal.contentView.layer.masksToBounds = YES;
return retVal;
}
JSON:
{
"Concours-1" : {
"Description" : "Description du concours",
"Title" : "Titre"
},
"Concours-2" : {
"Description" : "Description du concours",
"Titre" : "iPhone 6"
}
}
登录崩溃:
- [NSDictionaryI objectAtIndex:]:无法识别的选择发送到实例0x61000086c8c0 2017年7月18日10:00:26.787 jojol67 [7003:4420828] ***终止应用程序由于未捕获的异常 'NSInvalidArgumentException',原因: ' - [__ NSDictionaryI objectAtIndex:]:无法识别的选择发送到实例0x61000086c8c0' ***第一掷调用堆栈: ( 0的CoreFoundation 0x000000010c084b0b __exceptionPreprocess + 171 1 libobjc.A.dylib 0x000000010e5c9141 objc_exception_throw + 48 2 CoreFoundation 0x000000010c0f4134 - [NSObje CT(NSObject的)doesNotRecognizeSelector:] + 132 3的CoreFoundation 0x000000010c00b840 ___forwarding_ + 1024 4的CoreFoundation 0x000000010c00b3b8 _CF_forwarding_prep_0 + 120 5 jojol67 0x000000010756db3f - [DEMOConcoursTableViewController的CollectionView:cellForItemAtIndexPath:] + 191 6的UIKit 0x000000010d162925 - [UICollectionView _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes :isFocused:通知:] + 446 7的UIKit 0x000000010d162761 - [UICollectionView _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:] + 35 8的UIKit 0x000000010d1679bd - [UICollectionView _updateVisibleCellsNow:] + 4764 9的UIKit 0x000000010d16d38e - [UICollectionView layoutSubviews] + 313 10的UIKit 0x000000010c8f355b - [UIView的(CALayerDelegate)layoutSublayersOfLayer:] + 1268 11 QuartzCore 0x000000010c6a4904 - [CALayer的layoutSublayers] + 146 12 QuartzCore 0x000000010c698526 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 370 13 QuartzCore 0x000000010c6983a0 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24 14 QuartzCore 0x000000010c627e92 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 294 15 QuartzCore 0x000000010c654130 _ZN2CA11Transaction6commitEv + 468 16 QuartzCore 0x000000010c654b37 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 115 17 CoreFoundation 0x000000010c02a717 CFRUNLOOP_IS _CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION + 23 18个的CoreFoundation 0x000000010c02a687 __CFRunLoopDoObservers + 391 19的CoreFoundation 0x000000010c00f720 __CFRunLoopRun + 1200 20的CoreFoundation 0x000000010c00f016 CFRunLoopRunSpecific + 406 21 GraphicsServices 0x00000001103c2a24 GSEventRunModal + 62 22的UIKit 0x000000010c830134 UIApplicationMain + 159 23 jojol67 0x000000010752ef5f主+ 111 24 libdyld。dylib 0x000000010f31d65d start + 1 25 ??? 0x0000000000000001为0x0 + 1 ) 的libC++ abi.dylib:与类型的未捕获的异常终止NSException
///////火力地堡实时数据库////////
崩溃=>你有一个崩溃日志呢? – Larme
错误消息是显式的,并用JSON结构确认:您的JSON是顶级NSDictionary,而不是Array。 – Larme
你的self.contestArray是NSDictionary不是NSArray所以你必须访问NSDictionary * array = [self.contestArray objectForKey:“key”];使用NSLog(@“%@”,self.contestArray)来查看self.contestArray的键和值 –