[英]How to open an existing viewcontroller in ios
我需要在收到推送通知時從AppDelegate打開現有的viewcontroller。 目前,我每次都打開一個新文件,所以問題是每次都稱為viewDidLoad,並且一次又一次地重新初始化所有變量。
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{
[[NSUserDefaults standardUserDefaults] setObject:@"Yes" forKey:@"Got Message"];
[[NSUserDefaults standardUserDefaults] setObject:userInfo forKey:@"message"];
[[NSUserDefaults standardUserDefaults]synchronize];
HomeViewController* room = [[HomeViewController alloc] init];
[self.window.rootViewController presentViewController:room
animated:NO
completion:nil];
}
嘗試這樣做:
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{
[[NSUserDefaults standardUserDefaults] setObject:@"Yes" forKey:@"Got Message"];
[[NSUserDefaults standardUserDefaults] setObject:userInfo forKey:@"message"];
[[NSUserDefaults standardUserDefaults]synchronize];
[self.window.rootViewController presentViewController:self.room
animated:NO
completion:nil];
}
- (UIViewController *)room {
if (_room == NULL) {
_room = [[HomeViewController alloc] init];
}
return _room;
}
然后,您可以重用您的視圖控制器(但是,它將在您的AppDelegate中公開視圖控制器,這可能是純代碼的一種體驗)。
由於要使用現有的視圖控制器,因此為什么要使用代碼HomeViewController* room = [[HomeViewController alloc] init];
?
按照您的目標,我的建議是使用一個屬性來保留現有的視圖控制器,就像:
@property (strong, nonatomic) UIViewController *existingViewController;
你呢
[self.window.rootViewController presentViewController:existingViewController
animated:NO
completion:nil];
您可以在AppDelegate method中獲取UINavigationController
UIViewController *yourViewController = //your view controller to show after push
UINavigationController *navController = self.window.rootViewController;
[navController popToViewController:yourViewController animated:YES]
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