iOS12 shouldAlwaysAlertWhileAppIsForeground闪退

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我是靠谱客的博主冷傲秋天，这篇文章主要介绍iOS12 shouldAlwaysAlertWhileAppIsForeground闪退，现在分享给大家，希望可以做个参考。

在iOS12这样设置会闪退

UNMutableNotificationContent *content = [[UNMutableNotificationContent alloc] init];
[content setValue:@(YES) forKeyPath:@"shouldAlwaysAlertWhileAppIsForeground"];

这样做的目的通常是为了在前台收到推送通知, 或者本地通知时也显示弹窗, 所以可以修改以下方法设置

-(void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler API_AVAILABLE(ios(10.0)){
........
//当应用处于前台时提示设置，需要哪个可以设置哪一个
if (@available(iOS 10.0, *)) {
completionHandler(UNNotificationPresentationOptionSound|UNNotificationPresentationOptionBadge|UNNotificationPresentationOptionAlert);
} else {
// Fallback on earlier versions
}
}

另外如果你是iOS12的系统, 在前台收到推送后没有走这个方法, 检查

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
if (@available(iOS 10.0, *)) {
[UNUserNotificationCenter currentNotificationCenter].delegate=self; // 检查这个代理是否设置
}
}