ios8 - how can I present a UIAlertController above UIViewController.view.window -


now, created uiviewcontroller called viewcontroller, , add subview called maskview on viewcontroller via: 

uiview *maskview = [[uiview alloc] initwithframe:cgrectmake(0, 0, screen_size.width, screen_size.height)]; [self.view.window addsubview:maskview];

and on maskview there button called "deletebtn", when click on deletebtn, want present uialertcontroller via:

uialertcontroller *alertcontroller = [uialertcontroller alertcontrollerwithtitle:nslocalizedstring(@"mybulb.confirmremove", @"") message:@"" preferredstyle:uialertcontrollerstylealert]; uialertaction *cancelaction = [uialertaction actionwithtitle:nslocalizedstring(@"cancel", @"取消") style:uialertactionstyledefault handler:nil]; uialertaction *confirmaction = [uialertaction actionwithtitle:nslocalizedstring(@"confirm", @"确定") style:uialertactionstyledefault handler:^(uialertaction *action) { }]; [alertcontroller addaction:cancelaction]; [alertcontroller addaction:confirmaction]; [self presentviewcontroller:alertcontroller animated:yes completion:nil];

but alertcontroller not present on topmost screen, below maskview, how can show alertcontroller above maskview added on uiviewcontroller.view.window?

thanks much!

finally fixed problem creating new window object , switch between window , default one, code this:

if ([uialertcontroller class]) {    appdelegate *appdelegate = [uiapplication sharedapplication].delegate;    uialertcontroller *alertcontroller = [uialertcontroller alertcontrollerwithtitle:nslocalizedstring(@"readus.org.title", @"alert title") message:@"" preferredstyle:uialertcontrollerstylealert];   uialertaction *cancelaction = [uialertaction actionwithtitle:nslocalizedstring(@"readus.org.cancel", @"取消") style:uialertactionstyledefault handler:^(uialertaction *action) {   [appdelegate.window makekeyandvisible];   }];   uialertaction *confirmaction = [uialertaction actionwithtitle:nslocalizedstring(@"readus.org.confirm", @"确定") style:uialertactionstyledefault handler:^(uialertaction *action) {   //do like...   [appdelegate.window makekeyandvisible];   }];   [alertcontroller addaction:cancelaction];   [alertcontroller addaction:confirmaction];    [self.alertwindow makekeyandvisible];   [self.alertwindow.rootviewcontroller presentviewcontroller:alertcontroller animated:yes completion:nil]; }

and self.alertwindow defined as:

@property (strong, nonatomic) uiwindow *alertwindow;  - (uiwindow *)alertwindow {     if (!_alertwindow) {         _alertwindow = [[uiwindow alloc] initwithframe:[uiscreen mainscreen].bounds];         uiviewcontroller *viewcontroller = [[uiviewcontroller alloc] init];         _alertwindow.rootviewcontroller = viewcontroller;     }      return _alertwindow; }

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