struct GroceryProduct:Codable{varname:Stringvarpoints:Intvardescription:String?}letjson="""{"name":"Durian","points":600,"description":"A fruit with a distinctive scent."}""".data(using:.utf8)!letdecoder=JSONDecoder()letproduct=trydecoder.decode(GroceryProduct.self,from:json)print(product.name...
overrideinit(style:UITableViewCellStyle,reuseIdentifier:String?){super.init(style:style,reuseIdentifier:reuseIdentifier)logoImgView=UIImageView(frame:CGRectMake(10,15,63,63))logoImgView?.image=UIImage(named:"定位.png")self.addSubview(logoImgView!)buildLabel=UILabel(frame:CGRectMake(101.5,20,kWidth...
if let str = String(data: data, encoding: .utf8) { print("Successfully decoded: \(str)") }Using this optional approach avoids any problems around decoding invalid strings – if it succeeds you can be sure the string that was loaded is intact and correct....
更改print语句并启动任务，实际上会得到有效响应，状态码是200：let task = URLSession.shared.dataTask(with: URL(string: "https://google.com")!) { (data,response, error) in guardlet data = data,let response = response as? HTTPURLResponse, (200..<300) ~=response.statusCode else { iflet e...
经过几年的发展,Swift已经成为iOS开发语言的“中流砥柱”,Swift提供了非常灵活的高级别特性,例如协议、闭包、泛型等,并且Swift还进一步开发了强大的SIL(Swift Intermediate Language)用于对编译器进行优化,使得Swift相比Objective-C运行更快性能更优,Swift内部如何实现性能的优化,我们本文就进行一下解读,希望能对大家有所...
299) ~= response.statusCode else { print("statusCode should be 2xx, but is \(response.statusCode)") print("response = \(response)") onFailure(String(response.statusCode)) return } let responseString = String(data: data, encoding: .utf8) print("responseString = \(String(des...
funcapplicationDidEnterBackground(_application: UIApplication){// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.// If your applic...
leturl=URL(string:"<服务端地址>")!letrequest=URLRequest(url: url)letsemaphore=DispatchSemaphore(value:0)lettask=URLSession.shared.dataTask(with: request) { data,_,_inifletdata=data {letstring=String(decoding: data, as:UTF8.self)print(string) ...
1-> print("x == 1") 2,4-> print("x == 2 or x == 4") else-> print("x is something else") } String interpolation Swift: varname="Mike" print("Hello\(name)") 也可以给String规定格式: letstr=NSString(format:"%d , %f, %ld, %@",1,1.5,100,"Hello World") ...
completion(data) } } class ViewController: UIViewController { let model = Model() override func viewDidLoad() { super.viewDidLoad() model.getData { [weak self] (data: String) in self?.updateView(data) } } private func updateView(_ data: String) { print(data) } } 从选项1和选项2...