Obj-C UITable不填充MutableArray

Question

我有一个数组，当应用程序启动时加载它并获取正确的数据并填充数组但是一旦我转到tableviewcontroller，它表示数组为null。

这是我获取数据的地方

AppDelegate.h

@interface AppDelegate : UIResponder <UIApplicationDelegate>
{
    NSMutableArray *tableDicsArrayTickets;
    NSMutableArray *dictionaryStack;
    NSMutableString *textInProgress;
    NSError *errorPointer;
}
@property (strong, nonatomic) NSMutableArray *tableDicsArrayTickets;
@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) NSString *photo_URL;
+(NSDictionary *)dictionaryForXMLData:(NSData *)data error:(NSError **)errorPointer;
+(NSDictionary *)dictionaryForXMLString:(NSString *)string error:(NSError **)errorPointer;
+(AppDelegate *) getInstance; 

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{

    self.tableDicsArrayTickets = [[NSMutableArray alloc] init];

    NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];

    NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration:defaultConfigObject delegate:nil delegateQueue:[NSOperationQueue mainQueue]];

    NSURL *url = [NSURL URLWithString:@"http://MYURLexample.php"];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

    NSString *deviceCode = [[[UIDevice currentDevice] identifierForVendor] UUIDString];

    NSString *post = [[NSString alloc] initWithFormat:@"parameter=%@", deviceCode];

    [request setHTTPMethod:@"POST"];
    [request setHTTPBody:[post dataUsingEncoding:NSUTF8StringEncoding]];

    NSURLSessionDataTask *dataTask = [defaultSession dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        NSLog(@"Response:%@ %@\n", response, error);
        if(error == nil)
        {
            NSString *text =[[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];

            NSLog(@"Data = %@",text);

            NSDictionary *dics = [[NSDictionary alloc]initWithDictionary:[AppDelegate dictionaryForXMLString:text error:nil]];

            NSLog(@"dics is %@", dics);
            [self.tableDicsArrayTickets addObject:[[dics valueForKey:@"response"] valueForKey:@"text"]];
            NSLog(@"Array2 is %@", self.tableDicsArrayTickets);

        }
    }];
    [dataTask resume];

ViewController.h

@interface HistoryViewController : UIViewController<UITableViewDataSource, UITableViewDelegate>
{
    AppDelegate *mainDelegate;
}
@property (strong, nonatomic) AppDelegate *mainDelegate;

ViewController.m

#pragma
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [mainDelegate.tableDicsArrayTickets count];
}


-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 60;
}

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    NSMutableArray *array = mainDelegate.tableDicsArrayTickets;
    NSString *cellIdentifier = @"Cell";

    PhotoTableViewCell *cell = (PhotoTableViewCell *) [tableView dequeueReusableCellWithIdentifier:cellIdentifier];

    if(cell == nil)
    {
        cell = [[PhotoTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];


    }
    NSLog(@"Array is %@", [[array objectAtIndex:indexPath.row] objectForKey:@"text"]);
    cell.ticketNumber.text = [[array objectAtIndex:indexPath.row] objectForKey:@"text"];
    return cell;
}

我没有问题获取数组的数据它只是一次我最终去视图控制器与表上面的数组变为null。

Answer 1

我觉得你做了很多错事......

第一：

// AppDelegate.h

@interface AppDelegate : UIResponder <UIApplicationDelegate>
{
    // this should NOT be here
    NSMutableArray *tableDicsArrayTickets;

    NSMutableArray *dictionaryStack;
    NSMutableString *textInProgress;
    NSError *errorPointer;
}
@property (strong, nonatomic) NSMutableArray *tableDicsArrayTickets;
// ...

这应该给你一个编译警告：

autosynthesized property 'tableDicsArrayTickets' will use synthesized instance
variable '_tableDicsArrayTickets', not existing instance variable 'tableDicsArrayTickets'

与：相同：

//HistoryViewController.h

@interface HistoryViewController : UIViewController<UITableViewDataSource, UITableViewDelegate>
{
    // this should NOT be here
    AppDelegate *mainDelegate;
}
@property (strong, nonatomic) AppDelegate *mainDelegate;

哪个应该给你：

autosynthesized property 'mainDelegate' will use synthesized instance 
variable '_mainDelegate', not existing instance variable 'mainDelegate'

然后，你没有在HistoryViewController.m中展示你的位置（应该在viewDidLoad()中）：

_mainDelegate = (AppDelegate*)[[UIApplication sharedApplication] delegate];