我试图在我的应用程序中的视图列表上获取sql数据，确定它没关系，启动应用程序但是当我看到视图列表（没有sql数据）时，我看到了这个错误：< / p>
2014-09-05 16:33:21.54 Today[28849:60b] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UITableView dataSource must return a cell from tableView:cellForRowAtIndexPath:'
*** First throw call stack:
(
0 CoreFoundation 0x000000010194f495 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x00000001016ae99e objc_exception_throw + 43
2 CoreFoundation 0x000000010194f31a +[NSException raise:format:arguments:] + 106
3 Foundation 0x000000010124af19 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 189
4 UIKit 0x0000000100329a60 __53-[UITableView _configureCellForDisplay:forIndexPath:]_block_invoke + 346
5 UIKit 0x00000001002b3c2c +[UIView(Animation) performWithoutAnimation:] + 70
6 UIKit 0x0000000100329900 -[UITableView _configureCellForDisplay:forIndexPath:] + 101
7 UIKit 0x000000010032ffa3 -[UITableView _createPreparedCellForGlobalRow:withIndexPath:] + 373
8 UIKit 0x0000000100315d5b -[UITableView _updateVisibleCellsNow:] + 2337
9 UIKit 0x0000000100327721 -[UITableView layoutSubviews] + 207
10 UIKit 0x00000001002bb993 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 354
11 QuartzCore 0x0000000103f39802 -[CALayer layoutSublayers] + 151
12 QuartzCore 0x0000000103f2e369 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 363
13 QuartzCore 0x0000000103f2e1ea _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
14 QuartzCore 0x0000000103ea1fb8 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 252
15 QuartzCore 0x0000000103ea3030 _ZN2CA11Transaction6commitEv + 394
16 QuartzCore 0x0000000103ea369d _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 89
17 CoreFoundation 0x000000010191adc7 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
18 CoreFoundation 0x000000010191ad37 __CFRunLoopDoObservers + 391
19 CoreFoundation 0x00000001018fa522 __CFRunLoopRun + 946
20 CoreFoundation 0x00000001018f9d83 CFRunLoopRunSpecific + 467
21 GraphicsServices 0x0000000103ac6f04 GSEventRunModal + 161
22 UIKit 0x000000010025be33 UIApplicationMain + 1010
23 Today 0x0000000100003043 main + 115
24 libdyld.dylib 0x0000000101fe75fd start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
我不明白错误的位置，因为Xcode没有显示任何错误 这些是有问题的文件我希望有人可以帮助我，希望这是一些废话..
（适用MyWeekController.m）
#import "MyWeekViewController.h"
#import "Location.h"
@interface MyWeekViewController ()
{
HomeModel *_homeModel;
NSArray *_feedItems;
}
@end
@implementation MyWeekViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Set this view controller object as the delegate and data source for the table view
self.listTableView.delegate = self;
self.listTableView.dataSource = self;
// Create array object and assign it to _feedItems variable
_feedItems = [[NSArray alloc] init];
// Create new HomeModel object and assign it to _homeModel variable
_homeModel = [[HomeModel alloc] init];
// Set this view controller object as the delegate for the home model object
_homeModel.delegate = self;
// Call the download items method of the home model object
[_homeModel downloadItems];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(void)itemsDownloaded:(NSArray *)items
{
// This delegate method will get called when the items are finished downloading
// Set the downloaded items to the array
_feedItems = items;
// Reload the table view
[self.listTableView reloadData];
}
#pragma mark Table View Delegate Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of feed items (initially 0)
return _feedItems.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
// Retrieve cell
NSString *cellIdentifier = @"BasicCell";
UITableViewCell *myCell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
return myCell;
}
@end
（适用MyWeekController.h）
#import <UIKit/UIKit.h>
#import "HomeModel.h"
@interface MyWeekViewController : UIViewController <UITableViewDataSource, UITableViewDelegate, HomeModelProtocol>
@property (weak, nonatomic) IBOutlet UITableView *listTableView;
@end
（适用HomeModel.h）
#import <Foundation/Foundation.h>
@protocol HomeModelProtocol <NSObject>
- (void)itemsDownloaded:(NSArray *)items;
@end
@interface HomeModel : NSObject <NSURLConnectionDataDelegate>
@property (nonatomic, weak) id<HomeModelProtocol> delegate;
- (void)downloadItems;
@end
（适用HomeModel.m）
#import "HomeModel.h"
#import "Location.h"
@interface HomeModel()
{
NSMutableData *_downloadedData;
}
@end
@implementation HomeModel
- (void)downloadItems
{
// Download the json file
NSURL *jsonFileUrl = [NSURL URLWithString:@"http://mywebsite.netservice.php"];
//在上面的行中我更改了域名以保护隐私，实际上，该链接显示了一个sql结果数组
// Create the request
NSURLRequest *urlRequest = [[NSURLRequest alloc] initWithURL:jsonFileUrl];
// Create the NSURLConnection
[NSURLConnection connectionWithRequest:urlRequest delegate:self];
}
#pragma mark NSURLConnectionDataProtocol Methods
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
// Initialize the data object
_downloadedData = [[NSMutableData alloc] init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// Append the newly downloaded data
[_downloadedData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// Create an array to store the locations
NSMutableArray *_locations = [[NSMutableArray alloc] init];
// Parse the JSON that came in
NSError *error;
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:_downloadedData options:NSJSONReadingAllowFragments error:&error];
// Loop through Json objects, create question objects and add them to our questions array
for (int i = 0; i < jsonArray.count; i++)
{
NSDictionary *jsonElement = jsonArray[i];
// Create a new location object and set its props to JsonElement properties
Location *newLocation = [[Location alloc] init];
newLocation.name = jsonElement[@"Name"];
// Add this question to the locations array
[_locations addObject:newLocation];
}
// Ready to notify delegate that data is ready and pass back items
if (self.delegate)
{
[self.delegate itemsDownloaded:_locations];
}
}
@end
答案 0 :(得分：1)
将这行代码放在cellForRowAtIndexPath方法
if (!myCell) {
myCell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier: cellIdentifier];
}