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在iOS8以后使用通知要先注册

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    if ([UIApplication instancesRespondToSelector:@selector(registerUserNotificationSettings:)]) {        [application registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert |UIUserNotificationTypeBadge|UIUserNotificationTypeSound categories:nil]];    }    return YES;}

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