swift

iOS9 Swift File Creating NSFileManager.createDirectoryAtPath with NSURL

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I figured this one out. createDirectoryAtPath() is unable to process a path with the “file://” prefix. To get a path without the prefix you must use path() or relativePath(). let documentsPath = NSURL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]) let logsPath = documentsPath.URLByAppendingPathComponent(“logs”) do { try NSFileManager.defaultManager().createDirectoryAtPath(logsPath.path!, withIntermediateDirectories: true, attributes: nil) } catch let error as NSError { … Read more

Get random elements from array in Swift

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Xcode 11 • Swift 5.1 extension Collection { func choose(_ n: Int) -> ArraySlice<Element> { shuffled().prefix(n) } } Playground testing var alphabet = [“A”,”B”,”C”,”D”,”E”,”F”,”G”,”H”,”I”,”J”,”K”,”L”,”M”,”N”,”O”,”P”,”Q”,”R”,”S”,”T”,”U”,”V”,”W”,”X”,”Y”,”Z”] let shuffledAlphabet = alphabet.shuffled() // “O”, “X”, “L”, “D”, “N”, “K”, “R”, “E”, “S”, “Z”, “I”, “T”, “H”, “C”, “U”, “B”, “W”, “M”, “Q”, “Y”, “V”, “A”, “G”, “P”, “F”, “J”] … Read more

How do I insert an element at the correct position into a sorted array in Swift?

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Here is a possible implementation in Swift using binary search (from http://rosettacode.org/wiki/Binary_search#Swift with slight modifications): extension Array { func insertionIndexOf(_ elem: Element, isOrderedBefore: (Element, Element) -> Bool) -> Int { var lo = 0 var hi = self.count – 1 while lo <= hi { let mid = (lo + hi)/2 if isOrderedBefore(self[mid], elem) { … Read more

CLLocation Manager in Swift to get Location of User

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You are missing two things. First, you have to ask for permission using requestAlwaysAuthorization or requestWhenInUseAuthorization(). So your viewDidLoad() should be like this: var locationManager = CLLocationManager() override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. locationManager.delegate = self locationManager.desiredAccuracy = kCLLocationAccuracyBest locationManager.requestAlwaysAuthorization() locationManager.startUpdatingLocation() } Second, … Read more