如何在接收和點擊推送通知時顯示特定的UIViewController

Question

我想在收到推送通知並且用戶點擊該通知時顯示特定的UIViewController。 我進行了一些研究，並嘗試了一些成功的嘗試。

我嘗試了以下代碼，它可以在UIAlertController上運行，但沒有顯示我想要的特定UIViewController。 請幫幫我。 我正在使用Xcode 6.3。

-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    NSDictionary *userInfo = [launchOptions valueForKey:@"UIApplicationLaunchOptionsRemoteNotificationKey"];
    NSDictionary *apsInfo = [userInfo objectForKey:@"aps"];

    if(apsInfo) {

        UIStoryboard *myStoryBoard = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]];
        notificationViewController *nvc = [myStoryBoard instantiateViewControllerWithIdentifier:@"notificationViewController"];

        [self.window.rootViewController presentViewController:nvc animated:YES completion:nil];
    }

    return YES;
}

提前致謝

Answer 1

您可以創建一個用於處理通知有效負載的“ Router”對象，然后將該對象從ViewController傳遞到ViewController，從而逐步構建導航堆棧。

這是我為說明該概念而進行的示例項目的鏈接 。 為了演示起見，在對application:application handleOpenURL: buildNavigationStack進行調用之后，將構建“ Router”，但是您可以輕松地將其更改為使用application:didReceiveRemoteNotification:fetchCompletionHandler:收到的userInfo字典。

Answer 2

為此，我在AppDelegate類或Singleton類（如果項目中存在）中創建一個名為currentViewController的UIViewController變量。

對於創建的每個VC，我在viewWillAppear和viewDidAppear添加以下行：

[(myAppDelegate *)[[UIApplication sharedApplication] delegate] setCurrentViewController:self];

這樣，屏幕上顯示的VC始終保存在ivar中。

因此，在- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo或在您呈現alertViewController任何位置，您都可以輕松呈現或推送新的VC。

[self.currentViewController presentViewController:vc animated:YES completion:nil];

詳細解決方案：在這種方法中，關鍵和棘手的部分是將currentViewController設置為單例類。 休息會很簡單。

創建單例類：

//CapsHelper.h
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface CAPSHelper : NSObject
{

}

@property (nonatomic, strong) UIViewController * currentViewController;

+ (instancetype)sharedHelpers;

---

//CapsHelper.m
#import "CAPSHelper.h"
@interface CAPSHelper ()

@end

@implementation CAPSHelper

@synthesize currentViewController;

#pragma mark Singleton Methods
+ (instancetype) sharedHelpers
{
    static CAPSHelper *sharedMyManager = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedMyManager = [[self alloc] init];
    });
    return sharedMyManager;
}

假設您的應用中大約有10個視圖控制器，分別稱為VC1 ， VC2 ，..， VC10等。在每個VC的viewWillAppear:animated:

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [[CAPSHelper sharedHelpers] setCurrentViewController:self]
}

或者，如果這看起來像很多重復，您可以創建一個新類並覆蓋viewWillAppear:animated:您將不會想起要在將來創建的新VC上添加內容的麻煩。

現在，我們已經准備好了，每次將VC顯示到屏幕上時，我們都將其保存在一個名為currentViewController的變量中，並且可以通過導入#import "CAPSHelper.h"從任何位置進行訪問。

//AppDelegate.m
#import "AppDelegate.h"
#import "CAPSHelper.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    NSDictionary *userInfo = [launchOptions valueForKey:@"UIApplicationLaunchOptionsRemoteNotificationKey"];
    NSDictionary *apsInfo = [userInfo objectForKey:@"aps"];

    if(apsInfo)
    {
        if([[CAPSHelper sharedHelpers] currentViewController])
        {
            //UIViewController * pushNotificationViewController = [[UIViewController alloc] ..... This is your specific VC which you want to present when a PN is recieved..
            [[[CAPSHelper sharedHelpers] currentViewController] presentViewController:pushNotificationViewController animated:YES completion:nil];
        }
    }
}

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{
    NSDictionary *apsInfo = [userInfo objectForKey:@"aps"];
    if(apsInfo) 
    {
        if([[CAPSHelper sharedHelpers] currentViewController])
        {
            //UIViewController * pushNotificationViewController = [[UIViewController alloc] ..... This is your specific VC which you want to present when a PN is recieved..
            [[[CAPSHelper sharedHelpers] currentViewController] presentViewController:pushNotificationViewController animated:YES completion:nil];
        }
    }
}