Ios 可重复使用

我想制作一个“可重复使用”的MBProgressHUD。例如，我有一个类似这样的代码

- (void)viewDidLoad {
    HUD = [[MBProgressHUD alloc] init];
    HUD.delegate = self;

    [self functionOne];
}

- (void)functionOne {
    //turn on HUD
    HUD = [MBProgressHUD showHUDAddedTo:self.navigationController.view animated:YES];
    HUD.labelText = @"Loading with message 1";

    NSURLSessionDataTask *dataTask = [defaultSession 
        dataTaskWithRequest:urlRequest 
        completionHandler:^(NSData *dataRaw, NSURLResponse *header, NSError *error) 
            {
                //on completion turn off HUD and call functionTwo
                [HUD show:NO];
                [self functionTwo];
            }
    ];
}

- (void)functionTwo {
    //turn on again THE SAME HUD
    HUD = [MBProgressHUD showHUDAddedTo:self.navigationController.view animated:YES];
    HUD.labelText = @"Loading with message 2";

    NSURLSessionDataTask *dataTask = [defaultSession 
        dataTaskWithRequest:urlRequest 
        completionHandler:^(NSData *dataRaw, NSURLResponse *header, NSError *error) 
            {
                //on completion turn off THE SAME HUD
                [HUD show:NO];
            }
    ];
}

问题在于

//再次打开相同的HUD时代码崩溃，出现错误：

-[MBProgressHUD initWithView:]中的断言失败-由于未捕获的异常“NSInternalInconsistencyException”，正在终止应用程序，原因是：“视图不能为零。”

我不知道为什么，特别是如果我在viewDidLoad中分配并初始化它

另一件事是我不理解
[HUD隐藏：是]
和
[HUD显示：否]

编辑：这是我的原始代码

@implementation ReservasViewController
{
NSMutableArray *arrayPartidos;
MBProgressHUD *HUD;
NSInteger idPartidoEstado;
}

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
[[self navigationController] setNavigationBarHidden:NO animated:NO];
self.navigationController.navigationBarHidden = NO;
self.navigationController.navigationBar.hidden = NO;

[self obtenerPartidosJugador];
}

-(void)obtenerPartidosJugador
{
HUD = [[MBProgressHUD alloc] init];
HUD.delegate = self;
HUD = [MBProgressHUD showHUDAddedTo:self.navigationController.view animated:YES];
HUD.labelText = @"Cargando partidos...";

//----------------------
NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate: nil delegateQueue: [NSOperationQueue mainQueue]];

NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%s%s", root_server, obtener_reservas]];
NSMutableURLRequest * urlRequest = [NSMutableURLRequest requestWithURL:url];
[urlRequest setHTTPMethod:@"POST"];

NSURLSessionDataTask *dataTask = [defaultSession dataTaskWithRequest:urlRequest completionHandler:^(NSData *dataRaw, NSURLResponse *header, NSError *error) {

    NSDictionary *respServidor = [NSJSONSerialization JSONObjectWithData:dataRaw options:0 error:&error];
    NSLog(@"respServidor %@", respServidor);

    if(!error){

        if([[respServidor valueForKey:@"status"]  isEqual: @"true"]){

            arrayPartidos = [[NSMutableArray alloc] init];
            arrayPartidos = [[respServidor objectForKey:@"partidos"] mutableCopy];

            [self.tableView reloadData];

        }else{
            arrayPartidos = nil;
        }

    } else {
        NSLog(@"error --> %@", error);
    }

    [HUD hide:YES];
    [HUD show:NO];

}];

[dataTask resume];
}

//this function is called by a IBAction
-(void)cambiarEstadoPartido:(NSInteger)estado idPartido:(NSInteger)idpartido
{
HUD = [MBProgressHUD showHUDAddedTo:self.navigationController.view animated:YES];
HUD.labelText = @"Actualizando...";

NSString *noteDataString = [NSString stringWithFormat:@"estado=%ld&idpartido=%ld", estado, idpartido];
//----------------------
NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate: nil delegateQueue: [NSOperationQueue mainQueue]];

NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%s%s", root_server, cambiar_estado_partido]];
NSMutableURLRequest * urlRequest = [NSMutableURLRequest requestWithURL:url];
[urlRequest setHTTPMethod:@"POST"];
[urlRequest setHTTPBody:[noteDataString dataUsingEncoding:NSUTF8StringEncoding]];

NSURLSessionDataTask *dataTask = [defaultSession dataTaskWithRequest:urlRequest completionHandler:^(NSData *dataRaw, NSURLResponse *header, NSError *error) {

    NSDictionary *respServ = [NSJSONSerialization JSONObjectWithData:dataRaw options:0 error:&error];
    NSLog(@"respServidor %@", respServ);

    if(!error){

        if([[respServ valueForKey:@"status"]  isEqual: @"true"]){

            [HUD hide:YES];
            [HUD show:NO];

            [self obtenerPartidosJugador];

        }else{

            [HUD hide:YES];
            [HUD show:NO];

            UIAlertView *alertConfirm = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Ocurrio un error, vuelve a intentarlo" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil];
            alertConfirm.tag = 0;
            [alertConfirm show];

        }

    } else {

        [HUD hide:YES];
        [HUD show:NO];

        NSLog(@"error --> %@", error);
        UIAlertView *alertConfirm = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Ocurrio un error, vuelve a intentarlo" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil];
        alertConfirm.tag = 0;
        [alertConfirm show];

    }

}];

[dataTask resume];
}

编辑2：我删除了所有引用MBProgressHUD的行，我也删除了#导入和委托，但我仍然有那个错误！
[HUD隐藏：是]
使用动画隐藏HUD。
[HUD show:NO]
在没有动画的情况下显示拥抱

这个API的命名有点奇怪，它应该是这样的：
[HUD hideWithAnimated:
，
[HUD SHOWWITHANTINATED:

因此，您可能希望使用
[HUD hide:YES]
。。而不是
[HUD显示：否]

在功能二中，你有视野吗？如果您
NSLog（@“view:%@”，self.navigationController.view）
，会发生什么情况

另外，如果在之后重新分配HUD，为什么要在
viewDidLoad
中初始化HUD

我想您可能会对MBProgressHUD的使用感到困惑。
好的，我解决了我的问题。问题是我在以前的UIVIewController中的navigationController.view中添加了一个MBProgressHUD实例

 HUD = [MBProgressHUD showHUDAddedTo:self.navigationController.view animated:YES];

因此，我认为MBProgressHUD的前一个“实例”仍然停留在navigationController.view上，它确实破坏了我的应用程序

我希望我解释了我自己，我希望这将是有用的人在未来
 您正在尝试在导航视图中添加进度吗？我想你的问题来自于是的，我在导航视图中添加了无处不在的内容。问题是第二场演出。你说在哪里添加它？我使用
[MBProgressHUD hideHUDForView:theView animated:YES]而不是show:方法。你能试试吗？不，同样的事情也会发生。看编辑，我添加了我的原始代码。我知道我很困惑，那是因为我问了一个问题：P