当我点击whatsapp按钮时，UIActivityController会给出空白屏幕？

Question

所有活动在UIActivityController中运行良好，如电子邮件，Twitter，LinkedIn，Notes但是whatsapp工作不正常，当我点击whatsapp按钮时它显示一个空白屏幕..我找不到原来的问题。 ..

NSArray *excludedActivities    = @[UIActivityTypePrint, UIActivityTypePostToWeibo, UIActivityTypeMessage];


UIActivityViewController *activityViewController = [[UIActivityViewController alloc] initWithActivityItems:activityItems applicationActivities:applicationActivities];
activityViewController.excludedActivityTypes = excludedActivities;



[activityViewController setCompletionWithItemsHandler:^(NSString * __nullable activityType, BOOL completed, NSArray * __nullable returnedItems, NSError * __nullable activityError){

    NSLog(@"%@",activityType);

}];


[self presentViewController:activityViewController animated:YES completion:^{}];

}

在whatsapp的情况下不调用此方法...