MBProgressHUD无法显示

Question

我使用MBProgressHUD向用户显示提示，但它没有显示。有许多viewcontrollers使用相同的方法。只有一个页面不能显示它，这个视图控制器是用xib创建的。该方法如下：

-(void)creatHUD:(NSString *)hud {

    if (!HUD) {
        HUD = [[MBProgressHUD alloc] initWithView:self.view] ;
        [self.view addSubview:HUD];
        HUD.delegate = self;
    }
    HUD.labelText = hud;
}

Answer 1

试试这段代码

UIView *window = [UIApplication sharedApplication].keyWindow;

MBProgressHUD * hud = [MBProgressHUD showHUDAddedTo:window animated:YES];

[hud show:YES];

希望这能成功..。

Answer 2

既然问题还不清楚，我想你是想用背景线索来显示。请尝尝这个。

dispatch_async(dispatch_get_main_queue(), ^{
        //show Hud code here
    });

Answer 3

我也使用MBProgressHUD，我的实现是：

1. 只在MBProgressHUD中显示[UIApplication sharedApplication].keyWindow
2. 千万不要在视图中添加一个以上的Hud。 我将其打包，这是我的代码：

#define APP [UIApplication sharedApplication]
+ (MBProgressHUD *)Hud
{
    MBProgressHUD *hud = [MBProgressHUD HUDForView:APP.keyWindow];
    if (hud){
        [hud removeFromSuperview];
    }else{
        hud = [[MBProgressHUD alloc] initWithWindow:APP.keyWindow];
        hud.removeFromSuperViewOnHide = YES;
    }
    [APP.keyWindow addSubview:hud];
    return hud;
}

+ (void)showMsg:(NSString *)message
{
    MBProgressHUD *hud = [self Hud];
    hud.labelText = message;
    hud.mode = MBProgressHUDModeText;
    hud.labelFont = [UIFont systemFontOfSize:13];
    [hud show:YES];
    [hud hide:YES afterDelay:1.0];
}

+ (void)showLoading
{
    [self showLoading:@"please wait..."];
}

+ (void)showLoading:(NSString *)message
{
    MBProgressHUD *hud = [self Hud];
    hud.labelText = message;
    hud.mode = MBProgressHUDModeIndeterminate;
    hud.labelFont = [UIFont systemFontOfSize:13];
    [hud show:YES];
}

+ (void)hideHUD
{
    MBProgressHUD *hud = [MBProgressHUD HUDForView:APP.keyWindow];
    [hud hide:YES];
}