Swift で JavaScript 始めませんか？ #iOSDC
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Swift ランタイムで簡単に JavaScript を実行できる JavaScriptCore を Swift で使うための基礎のお話です。Swift と JavaScript の相互運用が簡単にできて面白いです。この資料は 2016/08/20 に iOSDC 2016 で発表したものになります。
![for (var index in lines)
{
var line = lines[index];
var itemContent;
if (line.match(expression))
{
itemContent = RegExp.$2;
}
var outputItem = core.escapeHtml(itemContent);
return outputItems.map(convertToTag).join('n');
}](https://image.slidesharecdn.com/iosdcswiftjavascript-160820075444/85/Swift-JavaScript-iOSDC-4-320.jpg)
![•toInt32() -> Int32
•toUInt32() -> UInt32
•toDouble() -> Double
•toNumber() -> NSNumber!
•toString() -> String!
•toBool() -> Bool!
•toObject() -> Any!
•toDate() -> Date!
•toArray() -> [Any]!
•toDictionary() -> [AnyHashable : Any]!](https://image.slidesharecdn.com/iosdcswiftjavascript-160820075444/85/Swift-JavaScript-iOSDC-34-320.jpg)
![let article: JSValue =
context.evaluateScript("article")!
// プロパティの参照
let title = article.forProperty("title")
// JavaScript メソッドの実行
let note = article.invokeMethod("getDescription",
withArguments: [])](https://image.slidesharecdn.com/iosdcswiftjavascript-160820075444/85/Swift-JavaScript-iOSDC-36-320.jpg)
![context.evaluateScript(
"function getAttribute(name) {" +
" return attributes[name];" +
"}")](https://image.slidesharecdn.com/iosdcswiftjavascript-160820075444/85/Swift-JavaScript-iOSDC-45-320.jpg)
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Swift で JavaScript 始めませんか？ #iOSDC
- 4. for (var index in lines) { var line = lines[index]; var itemContent; if (line.match(expression)) { itemContent = RegExp.$2; } var outputItem = core.escapeHtml(itemContent); return outputItems.map(convertToTag).join('n'); }
- 12. #iOSDC
- 27. let context = JSContext()!
- 28. context.evaluateScript("var v1 = 10") context.evaluateScript("var v2 = 20") context.evaluateScript("var v3 = v1 + v2")
- 29. let value = context.objectForKeyedSubscript("v3")! print("Answer = ", value) // Answer = 30 // 指定した名前が存在しない場合は undefined let value = context.objectForKeyedSubscript("vX")! print("Answer = ", value) // Answer = undefined
- 30. let answer = context.evaluateScript("v1 + v2")
- 34. •toInt32() -> Int32 •toUInt32() -> UInt32 •toDouble() -> Double •toNumber() -> NSNumber! •toString() -> String! •toBool() -> Bool! •toObject() -> Any! •toDate() -> Date! •toArray() -> [Any]! •toDictionary() -> [AnyHashable : Any]!
- 36. let article: JSValue = context.evaluateScript("article")! // プロパティの参照 let title = article.forProperty("title") // JavaScript メソッドの実行 let note = article.invokeMethod("getDescription", withArguments: [])
- 37. let value1: JSValue = context.objectForKeyedSubscript("v1")! let value2: JSValue = context.objectForKeyedSubscript("v2")! if value1 == value2 { }
- 43. context.evaluateScript("var timeout = 5.0")
- 44. let account = "@es_kumagai" // Swift 変数 account を、JavaScript に変数 name で登録 context.setObject(account, forKeyedSubscript: "name" as NSString)
- 45. context.evaluateScript( "function getAttribute(name) {" + " return attributes[name];" + "}")
- 46. let output : @convention(block) (String) -> Void = { NSLog("(account) : ($0)") } // クロージャーを AnyObject 型にキャストして登録 context.setObject( unsafeBitCast(output, to: AnyObject.self), forKeyedSubscript: "output" as NSString)
- 47. context.evaluateScript( "function Article(title, body) {" + " this.title = title;" + " this.body = body;" + "}" + "" + "Article.prototype.getDescription = " + " function() {" + " return this.body.substr(0, 10);" + "};")
- 48. @objc protocol ImageInterface : JSExport { var width: Int { get set } var height: Int { get set } // インスタンス化をしたい場合は静的メソッドも宣言 static func make(name: String, scale: CGFloat) -> AnyObject }
- 49. class Image : NSObject, ImageInterface { var width, height: Int required init(name: String, scale: CGFloat) {…} class func make(name: String, scale: CGFloat) -> AnyObject { return self.init(name: name, scale: scale) }
- 50. let image = Image(name: "Profile", scale: 0.8) context.setObject(image, forKeyedSubscript: "icon" as NSString)
- 51. context.setObject(Image.self, forKeyedSubscript: "Image" as NSString) // メソッドは、全てのラベルを名前に含めて実行すること context.evaluateScript( "var banner = " + "Image.makeWithNameScale('picture', 0.5)")
- 54. context.evaluateScript( "function Article(title, body) {" + " this.title = title;" + " this.body = body;" + "}" + "" + "Article.prototype.getDescription = " + " function() {" + " return this.body.substr(0, 10);" + "};")
- 58. let path = Bundle.main.url( forResource: "JavaScriptAPI", withExtension: "js")! let source = try! String(contentsOf: path) // 読み込んだ JavaScript をコンテキストで実行 let context = JSContext()! context.evaluateScript(source)