Show pagesourceOld revisionsBacklinksExport to PDFBack to top Share on ... Twitter LinkedIn Facebook Table of Contents iOS Developer Interview Question 1 Question 2 Question 3 Question 4 Question 5 iOS Developer Interview Question 1 Consider the following code. What's the value of the len variable, and why? 参考以下的代码,len的值为何?请解释。 var array1 = [1, 2, 3, 4, 5] var array2 = array1 array2.append(6) var len = array1.count Question 2 Consider the following code. Where is the error and why? How can it be fixed? 参考以下的代码,那里出错了?请解释。如何修复? let op1: Int = 1 let op2: UInt = 2 let op3: Double = 3.34 var result = op1 + op2 + op3 Question 3 Consider the following code. What is the bug and how does it affect memory? How can it be fixed? 参考以下的代码,那里出错了以及如何影响内存?如何修复? class Master { lazy var detail: Detail = Detail(master: self) init() { println("Master init") } deinit { println("Master deinit") } } class Detail { var master: Master init(master: Master) { println("Detail init") self.master = master } deinit { println("Detail deinit") } } func createMaster() { var master: Master = Master() var detail = master.detail } createMaster() Question 4 Consider the following UITableViewCell constructor. What is the purpose of the reuseIdentifier? What is the advantage of setting it to a non-nil value? 参考以下UITableViewCell构造数,reuseIdentifier的作用是什麽?把它设定为non-nil值有什麽好处? init(style: UITableViewCellStyle, reuseIdentifier: String?) Question 5 Write down the log results at 3 different cases Start MainViewController Push to ViewControllerTwo from MainViewController User press back button from ViewControllerTwo 我们有以下兩段代码,请分别写下以下三种执行后log的结果 开始 MainViewController 從 MainViewController 推向 ViewControllerTwo 用户在 ViewControllerTwo 按back button class MainViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() print("MainViewController :", "viewDidLoad") } override func viewWillLayoutSubviews() { super.viewWillLayoutSubviews() print("MainViewController :", "viewWillLayoutSubviews") } override func viewDidLayoutSubviews() { super.viewDidLayoutSubviews() print("MainViewController :", "viewDidLayoutSubviews") } override func viewWillAppear(_ animated: Bool) { super.viewWillAppear(animated) print("MainViewController :", "viewWillAppear") } override func viewDidAppear(_ animated: Bool) { super.viewDidAppear(animated) print("MainViewController :", "viewDidAppear") } override func viewWillDisappear(_ animated: Bool) { super.viewWillDisappear(animated) print("MainViewController :", "viewWillDisappear") } override func viewDidDisappear(_ animated: Bool) { super.viewDidDisappear(animated) print("MainViewController :", "viewDidDisappear") } deinit { print("MainViewController :", "deinit") } } class ViewControllerTwo: UIViewController { override func viewDidLoad() { super.viewDidLoad() print("ViewControllerTwo :", "viewDidLoad") } override func viewWillLayoutSubviews() { super.viewWillLayoutSubviews() print("ViewControllerTwo :", "viewWillLayoutSubviews") } override func viewDidLayoutSubviews() { super.viewDidLayoutSubviews() print("ViewControllerTwo :", "viewDidLayoutSubviews") } override func viewWillAppear(_ animated: Bool) { super.viewWillAppear(animated) print("ViewControllerTwo :", "viewWillAppear") } override func viewDidAppear(_ animated: Bool) { super.viewDidAppear(animated) print("ViewControllerTwo :", "viewDidAppear") } override func viewWillDisappear(_ animated: Bool) { super.viewWillDisappear(animated) print("ViewControllerTwo :", "viewWillDisappear") } override func viewDidDisappear(_ animated: Bool) { super.viewDidDisappear(animated) print("ViewControllerTwo :", "viewDidDisappear") } deinit { print("ViewControllerTwo :", "deinit") } } interview/developer/ios/start.txt Last modified: 2018/06/04 12:37by don.lee