iphone - Why MBProgressHUD not show, when an alert show before HUD show? -

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i use code init mbprogresshud 

    uiwindow *window = [[uiapplication sharedapplication] keywindow]       _hud = [[mbprogresshud alloc]initwithwindow:window];     _hud.dimbackground = bdim;     _hud.labeltext = message;     [window addsubview:_hud];     [_hud show:yes];

but _hud not show in window ? let me know im lack here?? thanks!

click here! works me .just use window.

uiwindow *keywindow = [[[uiapplication sharedapplication] delegate] window];

or can use 

self.navigationcontroller.view

to add hud.


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