透明的ViewController

 UINavigationController*navi = [self.storyboard instantiateViewControllerWithIdentifier:@"DetailNavi"];

    WishDetailViewController* wishDetail = [navi childViewControllers][0];

    wishDetail.isSelf = _friendIndex==0;

    wishDetail.data  = _selectedWish;

    if ([[[UIDevice currentDevice] systemVersion] floatValue]>=8.0) {

        

        navi.modalPresentationStyle=UIModalPresentationOverCurrentContext;

        

    }else{

        

        self.modalPresentationStyle=UIModalPresentationCurrentContext;

        

    }

    [self.tabBarController presentViewController:navi animated:YES completion:nil];