收到推送通知后,如何判断我的iPhone应用程序是否正在运行？

Question

我正在向我的iPhone应用程序发送推送通知,我想要执行一组不同的指令,具体取决于应用程序是否已经启动.我是iPhone开发的新手,虽然我怀疑UIApplication或我的项目的AppDelegate类有解决方案,但我还没有找到一个好的答案.有没有简单的方法来检查这个？

Answer 1

这是处理应用程序的活动/非活动状态的更合适的方法.

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {   
        // check for the app state
        UIApplicationState state = [application applicationState];

        if (state == UIApplicationStateActive) {
            //the app is in the foreground, so here you do your stuff since the OS does not do it for you
            //navigate the "aps" dictionary looking for "loc-args" and "loc-key", for example, or your personal payload)
        }

    application.applicationIconBadgeNumber = 0;
}

didReceiveRemoteNotification:在应用程序运行时调用,是的,但是当它被暂停时,iOS负责放置徽章等.如果应用程序在前台,操作系统什么都不做,只需调用你的didReceiveRemoteNotification:.

Answer 2

根据"发布"的含义,您要么寻找:

• 凯文上面的答案(区分发布或未发布)
• 或者这个(区分暂停或活跃,但已经启动):

使用在应用程序变为活动时设置为true的标志,并在应用程序未处于活动状态时设置为false.

标记(在头文件[.h]中):

BOOL applicationIsActive;

代码(在实现文件[.m]中):

- (void)applicationDidBecomeActive:(UIApplication *)application {
    applicationIsActive = YES;
}

- (void)applicationWillResignActive:(UIApplication *)application {
    applicationIsActive = NO;
}

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{
    if (applicationIsActive) {
        // Handle notification in app active state here
    }
    else {
        // Handle notification in app suspended state here
    }

这是有效的,因为当应用程序暂停时,操作系统在"唤醒"过程中调用"applicationDidBecomeActive"之前调用"applicationDidReceiveRemoteNotification".

"完整"答案实际上是凯文的回答加上这个答案.

希望这可以帮助.

Answer 3

UIApplication委托有方法

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

你需要实现的.这会在应用程序运行时收到通知.

如果您的应用当前未运行且收到通知,则可以启动您的应用

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

使用launchOptions字典中保存的通知详细信息.如果字典为零,则用户正常点击应用程序图标.

Answer 4

如果要检查iOS上的applicationState是否小于4,则需要检查是否支持applicationState:

if ([application respondsToSelector:@selector(applicationState)] ){
  // Safe to check applicationState
  UIApplicationState state = [application applicationState];
}