检查IOS 8中是否启用了本地通知

Question

我已经在互联网上查看了如何使用IOS 8创建本地通知.我发现了许多文章,但没有解释如何确定用户是否已设置"警报"开启或关闭.请有人帮帮我!!! 我更喜欢使用Objective C over Swift.

Answer 1

您可以通过检查它UIApplication的currentUserNotificationSettings

if ([[UIApplication sharedApplication] respondsToSelector:@selector(currentUserNotificationSettings)]){ // Check it's iOS 8 and above
    UIUserNotificationSettings *grantedSettings = [[UIApplication sharedApplication] currentUserNotificationSettings];

    if (grantedSettings.types == UIUserNotificationTypeNone) {
        NSLog(@"No permiossion granted");
    }
    else if (grantedSettings.types & UIUserNotificationTypeSound & UIUserNotificationTypeAlert ){
        NSLog(@"Sound and alert permissions ");
    }
    else if (grantedSettings.types  & UIUserNotificationTypeAlert){
        NSLog(@"Alert Permission Granted");
    }
}

希望这有帮助,如果您需要更多信息,请告诉我

Answer 2

要扩展Albert的答案,您不需要rawValue在Swift中使用.因为UIUserNotificationType符合OptionSetType它可以执行以下操作:

if let settings = UIApplication.shared.currentUserNotificationSettings {
    if settings.types.contains([.alert, .sound]) {
        //Have alert and sound permissions
    } else if settings.types.contains(.alert) {
        //Have alert permission
    }
}

您可以使用括号[]语法来组合选项类型(类似于|用于组合其他语言中的选项标志的按位或运算符).

Answer 3

斯威夫特guard:

guard let settings = UIApplication.sharedApplication().currentUserNotificationSettings() where settings.types != .None else {
    return
}

Answer 4

这是Swift 3中的一个简单函数,用于检查是否启用了至少一种类型的通知.

请享用!

static func areNotificationsEnabled() -> Bool {
    guard let settings = UIApplication.shared.currentUserNotificationSettings else {
        return false
    }

    return settings.types.intersection([.alert, .badge, .sound]).isEmpty != true
}

感谢MichałKałużny的灵感.

Answer 5

编辑:看看@ simeon的回答.

在Swift中,您需要使用rawValue:

let grantedSettings = UIApplication.sharedApplication().currentUserNotificationSettings()
if grantedSettings.types.rawValue & UIUserNotificationType.Alert.rawValue != 0 {
    // Alert permission granted
}