小编Har*_*rry的帖子

我正在尝试创建一个简单的天气应用程序,它使用JSON从OpenweatherMap获取数据并在UITableView中打印出来.但是,当我执行下面的代码并在numberOfRowsInSection方法中设置断点时,它返回0行.不知何故,该viewDidLoad方法在该numberOfRowsInSection方法之后调用,这就是为什么threeHoursForecast数组为空.有人可以帮我吗？

static NSString * const BaseURLString = @"http://api.openweathermap.org/data/2.5/forecast?q=Houston";

@interface HPViewController ()

@end

@implementation HPViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.threeHoursForecast = [[NSMutableArray alloc] init];
    self.tableView.dataSource = self;
    self.tableView.delegate = self;

    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

    [manager POST:BaseURLString parameters:nil
          success:^(AFHTTPRequestOperation *operation, id responseObject) {

              NSArray *data = [responseObject objectForKey:@"list"];

              for (NSDictionary *forecastPerThreeHours in data) …