我正在使用 content-available=1 测试推送通知，除非在 Wi-Fi 上，否则它们似乎不会在后台传送到应用程序。

我在推送通知处理程序的开头有一个简单的日志语句:

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
                                                    fetchCompletionHandler:(void (^)   (UIBackgroundFetchResult))completionHandler {

    NSLog(@"Notification received: %@", userInfo);
    completionHandler(UIBackgroundFetchResultNewData);
}

这是我的测试:

1. 运行应用，然后按主页按钮将应用置于后台。
2. 发送 content-available=1 的推送通知
3. 查看控制台日志

在 Wi-Fi 上，控制台日志显示通知。如果我转到“设置”并关闭 Wi-Fi，切换到 4G，通知将不再出现在日志中(尽管它们确实滑入屏幕顶部，所以我知道它们正在传送)。

没有崩溃日志，如果我手动点击它会记录通知。此外，如果我在 Xcode 中调试应用程序，则不会出现此问题。 (即，如果我在 Xcode 中调试，应用程序将在 4G 的后台接收通知)。有没有其他人经历过这种行为？还是我做错了什么？

编辑: 具体来说:根据我的测试，如果满足以下条件，则不会调用上面的远程通知委托(delegate)方法:

1. 应用程序在后台运行
2. 手机使用 LTE 网络，未连接 Wi-Fi
3. 应用程序未在 Xcode 调试器中运行
4. 手机收到 content-available=1 的通知

但是，如果条件 2 被移除(即手机已连接到 Wi-Fi)，则将调用处理程序。

最佳答案

试试下面的代码:

// AppDelegate.h

@class ViewController;

@interface AppDelegate : UIResponder <UIApplicationDelegate>
{

    NSString *DeviceToken;
    NSMutableDictionary *App_Messages;

    NSString *Longitude,*Latitude;
    NSMutableDictionary * badge;
}

@property (strong, nonatomic) UIWindow *window;

@property (strong, nonatomic) ViewController *viewcontrollervc;

@property (strong, nonatomic) UINavigationController *navcontroller;

@property (nonatomic,retain)NSMutableDictionary *badge;

@property (nonatomic,retain)NSString *DeviceToken;

// AppDelegate.m

#import "ViewController.h"

@implementation AppDelegate

@synthesize badge,DeviceToken;

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

    self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];
    self.viewcontrollervc = [[ViewController alloc]initWithNibName:@"ViewController" bundle:nil];
    self.navcontroller = [[UINavigationController alloc]initWithRootViewController:self.viewcontrollervc];
    self.window.rootViewController = self.navcontroller;
    self.navcontroller.navigationBarHidden = YES;


    //Notification
    [[UIApplication sharedApplication] registerForRemoteNotificationTypes:
     (UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];
    NSDictionary * remoteNotificationObj = [launchOptions objectForKey:@"UIApplicationLaunchOptionsRemoteNotificationKey"];
    if (remoteNotificationObj)
    {
        [self performSelector:@selector(handleRemoteNotificationWithUserInfo:) withObject:remoteNotificationObj afterDelay:3.0];
    }

    [self.window makeKeyAndVisible];
    return YES;

}


- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{

    [self handleRemoteNotificationWithUserInfo:userInfo];

}

-(void)handleRemoteNotificationWithUserInfo:(NSDictionary *)userInfo
{

    NSLog(@"userInfo - %@",userInfo);
    NSDictionary *alertData = [userInfo objectForKey:@"aps"];
    NSDictionary *returnDatalert=[alertData objectForKey:@"alert"];
    NSString *alertmsg=[returnDatalert objectForKey:@"body"];

    NSLog(@"alertmsg %@",alertmsg);
    self.badge = [NSMutableDictionary dictionaryWithDictionary:[alertData objectForKey:@"badge"]];
    NSString *notificationtype=[badge objectForKey:@"fnct"];

    NSLog(@"%@",notificationtype);

}


- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{

   NSLog(@"didRegisterForRemoteNotificationsWithDeviceToken: %@", deviceToken);
    NSString *dt = [[deviceToken description] stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"<>"]];
    dt = [dt stringByReplacingOccurrencesOfString:@" " withString:@""];
    self.DeviceToken=dt;
    NSLog(@"~~~~devToken(dv)=%@",deviceToken);

}

- (void)application:(UIApplication*)application didFailToRegisterForRemoteNotificationsWithError:(NSError*)error
{

    NSLog(@"Failed to get token, error: %@", error);

}

关于iOS UIBackgroundMode 远程通知不适用于 4G，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24928590/