NSJSONSerialization未被调用

NSJSONSerialization未被调用 - 目标C.(NSJSONSerialization Not Getting Called - Objective C)

我正在尝试使用从JSON对象中提取的数据数组填充TableViewContoller中的TableViewCells。 NSJSONSerialization根本就没有被调用。

我使用DataTaskWithURL尝试过各种各样的东西。 可悲的是，我在数组中找到了0个项目。 在此先感谢任何人的帮助！

@property NSArray *toothpastes; @end @implementation ToothpastChoicesTableViewController - (void)viewDidLoad { [super viewDidLoad]; NSString *urlString = @"https://s3.amazonaws.com/mmios8week/toothpastes.json"; NSURLSession *session = [NSURLSession sharedSession]; [session dataTaskWithURL:[NSURL URLWithString:urlString] completionHandler:^ (NSData *data, NSURLResponse *response, NSError *error) { if (error) { NSLog(@"%@", error); } else { self.toothpastes = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error]; [self.tableView reloadData]; } }]; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { NSLog(@"%lu", (unsigned long)self.toothpastes.count); return self.toothpastes.count; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"CellID" forIndexPath:indexPath]; cell.textLabel.text = self.toothpastes[indexPath.row]; return cell; }

I am trying to populate the TableViewCells in my TableViewContoller with an Array of data that is being pulled from a JSON object. NSJSONSerialization is simply not getting called.

I've tried a variety of things using DataTaskWithURL. Sadly I'm coming up empty with 0 items found in the array. Thanks in advance for anyone's help!

@property NSArray *toothpastes; @end @implementation ToothpastChoicesTableViewController - (void)viewDidLoad { [super viewDidLoad]; NSString *urlString = @"https://s3.amazonaws.com/mmios8week/toothpastes.json"; NSURLSession *session = [NSURLSession sharedSession]; [session dataTaskWithURL:[NSURL URLWithString:urlString] completionHandler:^ (NSData *data, NSURLResponse *response, NSError *error) { if (error) { NSLog(@"%@", error); } else { self.toothpastes = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error]; [self.tableView reloadData]; } }]; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { NSLog(@"%lu", (unsigned long)self.toothpastes.count); return self.toothpastes.count; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"CellID" forIndexPath:indexPath]; cell.textLabel.text = self.toothpastes[indexPath.row]; return cell; }

最满意答案

你忘了恢复任务

NSURLSessionDataTask *task = [session dataTaskWithURL:[NSURL URLWithString:urlString] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { if (error) { NSLog(@"%@", error); } else { self.toothpastes = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error]; [self.tableView reloadData]; } }]; [task resume];

You forgot to resume the task

NSURLSessionDataTask *task = [session dataTaskWithURL:[NSURL URLWithString:urlString] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { if (error) { NSLog(@"%@", error); } else { self.toothpastes = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error]; [self.tableView reloadData]; } }]; [task resume];