if ([UIApplication instancesRespondToSelector:@selector(registerUserNotificationSettings:)])
        
    {
        
        [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|UIUserNotificationTypeSound categories:nil]];
        
    }

IOS8中需要先注册本地通知，用户点击了同意之后才能接受本地通知。