Swiftではポインタの取扱においても、 if let 構文などの null安全機構が使えるのです。UnsafePointer<T>、UnsafeMutablePointer<T>、OpaquePointer の間での変換コンストラクタについては、Optional版があり、引数としてnilが渡されるとコンストラクタもnilを返します。
)->Bool{// Override point for customization after application launch.window =UIWindow(frame:UIScreen.main.bounds)// Allow the app run without a storyboardifletwindow = window {letmainViewController =PictureLaunchViewController() navigationController =UINavigationController(rootViewControll...
private let eventHandler: EventHandler public init(url: URL, eventHandler: @escaping EventHandler) throws { self.url = url self.eventHandler = eventHandler try observe() } deinit { // 掃除 if let fileSystemObjectSource = fileSystemObjectSource { fileSystemObjectSource.setEventHandler { } fileSystem...
let imageState = await self.networking.downloadMediumRendition(identifier: imageIdentifier) return imageStateイメージを取得するネットワーキング・コードによって、"downloadRendition"リクエスト・オブジェクトが作成され、'Medium'という名前のレンディションがjpg形式で取得されます。リクエスト...
let mutateScope = events.beginScope(activity: "mutate object with completion") // Write event try! realm.write { // Add a userId person.userId = "tony.stark@starkindustries.com" } mutateScope.commit(completion: { error in if let error = error { print("Error recording write event: \(...
let realm = try await Realm(configuration: flexSyncConfig) let subscriptions = realm.subscriptions try await subscriptions.update { if let foundSubscription = subscriptions.first(ofType: Team.self, where: { $0.teamName == "Developer Education" }) { foundSubscription.updateQuery(toType: Team.self...
if(self.isViewLoaded&&(self.view.window!=nil)) のブロック内に処理を書きます。こうしないと、複数ViewControllerでNSNotificationCenter登録している場合、表示されていないViewControllerでも処理が実行されるので、条件付きにしています。
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// 最初の映像ストリームを探すlettarget=AVMEDIA_TYPE_VIDEOvaravStream:UnsafeMutablePointer<AVStream>?=nilvarn=-1foriin0..<Int(formatContext.memory.nb_streams){lets=formatContext.memory.streams[i]ifs.memory.codec.memory.codec_type.value==target.value{avStream=sn=i}}ifavStream==nil{println(...
(of:pos)letlocation=sender.location(in:messageTextView)lettextPosition=messageTextView.closestPosition(to:location)lettapPosition=messageTextView.offset(from:messageTextView.beginningOfDocument,to:textPosition!)ifNSLocationInRange(tapPosition,nameRange){print("たま")}ifNSLocationInRange(tapPosition,pos...