根据 Apple 文档,为了查明用户是否点击了您的推送通知,您应该检查 application:didReceiveRemoteNotification 中的
applicationState
:
If the value is UIApplicationStateInactive, the user tapped the action button; if the value is UIApplicationStateActive, the application was frontmost when it received the notification.
我发现这并不总是正确的。例如:
双击主页按钮以显示系统托盘并进入“快速应用程序切换模式”,您的应用程序向上滑动以显示其他正在运行的应用程序,并且您的应用程序将进入非事件状态(即使它仍然大部分可见)。如果您在此模式下收到推送通知,您的应用委托(delegate)将仍收到application:didReceiveRemoteNotification:
,此时您的applicationState 为UIApplicationStateActive
。根据文档,您应该像用户点击警报一样对待它……但在这种情况下他们没有。不仅如此,用户甚至没有看到推送通知(可能是因为在这种模式下您的应用程序的顶部被截断了)。
有谁知道检测处于“快速应用切换模式”或正确处理通知的方法吗?
最佳答案
我能够通过一些漂亮的检查自己修复它...
从本质上讲,这整个事情的关键是
-(void)applicationDidEnterBackground:(UIApplication *)application;
当您进入快速应用切换(或控制中心)时不会调用此方法,因此您需要根据它设置检查。
@property BOOL isInBackground;
@property (nonatomic, retain) NSMutableArray *queuedNotifications;
当您收到通知时...
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {
UIApplicationState appState = application.applicationState;
// Check if we're in this special state. If so, queue the message up
if (appState == UIApplicationStateInactive && !self.isInBackground) {
// This is a special case in which we're in fast app switching or control center
if (!self.queuedNotifications) {
self.queuedNotifications = [NSMutableArray array];
}
// Queue this to show when we come back
[self.queuedNotifications addObject:userInfo];
}
}
然后当我们回来的时候...
- (void)applicationDidBecomeActive:(UIApplication *)application {
application.applicationIconBadgeNumber = 0;
if (!self.isInBackground) {
// Show your notifications here
// Then make sure to reset your array of queued notifications
self.queuedNotifications = [NSMutableArray array];
}
}
您可能还想做的另一件事是检查这种特殊情况,即快速切换应用程序和用户转到其他地方。我在设置 isInBackground BOOL 之前执行此操作。我选择将它们作为本地通知发送
-(void)applicationDidEnterBackground:(UIApplication *)application {
for (NSDictionary *eachNotification in self.queuedNotifications) {
UILocalNotification *notification = [self convertUserInfoToLocalNotification:eachNotification];
[[UIApplication sharedApplication] scheduleLocalNotification:notification];
}
self.queuedNotifications = [NSMutableArray array];
self.isInBackground = YES;
}
关于iOS:推送通知、UIApplicationStateInactive 和快速应用切换,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18707210/