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122 lines
4.2 KiB
Swift
122 lines
4.2 KiB
Swift
/*
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Copyright (C) 2015 Apple Inc. All Rights Reserved.
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See LICENSE.txt for this sample’s licensing information
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Abstract:
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This file shows an example of implementing the OperationCondition protocol.
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*/
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#if os(iOS)
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import UIKit
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/**
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A condition for verifying that we can present alerts to the user via
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`UILocalNotification` and/or remote notifications.
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*/
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struct UserNotificationCondition: OperationCondition {
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enum Behavior {
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/// Merge the new `UIUserNotificationSettings` with the `currentUserNotificationSettings`.
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case Merge
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/// Replace the `currentUserNotificationSettings` with the new `UIUserNotificationSettings`.
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case Replace
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}
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static let name = "UserNotification"
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static let currentSettings = "CurrentUserNotificationSettings"
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static let desiredSettings = "DesiredUserNotificationSettigns"
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static let isMutuallyExclusive = false
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let settings: UIUserNotificationSettings
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let application: UIApplication
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let behavior: Behavior
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/**
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The designated initializer.
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- parameter settings: The `UIUserNotificationSettings` you wish to be
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registered.
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- parameter application: The `UIApplication` on which the `settings` should
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be registered.
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- parameter behavior: The way in which the `settings` should be applied
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to the `application`. By default, this value is `.Merge`, which means
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that the `settings` will be combined with the existing settings on the
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`application`. You may also specify `.Replace`, which means the `settings`
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will overwrite the exisiting settings.
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*/
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init(settings: UIUserNotificationSettings, application: UIApplication, behavior: Behavior = .Merge) {
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self.settings = settings
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self.application = application
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self.behavior = behavior
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}
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func dependencyForOperation(operation: Operation) -> NSOperation? {
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return UserNotificationPermissionOperation(settings: settings, application: application, behavior: behavior)
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}
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func evaluateForOperation(operation: Operation, completion: OperationConditionResult -> Void) {
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let result: OperationConditionResult
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let current = application.currentUserNotificationSettings()
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switch (current, settings) {
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case (let current?, let settings) where current.contains(settings):
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result = .Satisfied
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default:
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let error = NSError(code: .ConditionFailed, userInfo: [
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OperationConditionKey: self.dynamicType.name,
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self.dynamicType.currentSettings: current ?? NSNull(),
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self.dynamicType.desiredSettings: settings
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])
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result = .Failed(error)
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}
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completion(result)
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}
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}
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/**
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A private `Operation` subclass to register a `UIUserNotificationSettings`
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object with a `UIApplication`, prompting the user for permission if necessary.
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*/
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private class UserNotificationPermissionOperation: Operation {
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let settings: UIUserNotificationSettings
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let application: UIApplication
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let behavior: UserNotificationCondition.Behavior
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init(settings: UIUserNotificationSettings, application: UIApplication, behavior: UserNotificationCondition.Behavior) {
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self.settings = settings
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self.application = application
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self.behavior = behavior
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super.init()
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addCondition(AlertPresentation())
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}
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override func execute() {
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dispatch_async(dispatch_get_main_queue()) {
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let current = self.application.currentUserNotificationSettings()
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let settingsToRegister: UIUserNotificationSettings
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switch (current, self.behavior) {
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case (let currentSettings?, .Merge):
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settingsToRegister = currentSettings.settingsByMerging(self.settings)
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default:
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settingsToRegister = self.settings
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}
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self.application.registerUserNotificationSettings(settingsToRegister)
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}
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}
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}
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#endif
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