Swift’s nil is not the same as nil in Objective-C. In Objective-C, nil is a pointer to a non-existent object. In Swift, nil is not a pointer—it is the absence of a value of a certain type. Optionals of any type can be set to nil, not just object types. NULL has no equivalent in Swift. nil is also called nil in Swift. Nil has no equivalent ...

2023年3月7日 · Cezar's answer is outdated (since Swift 3) and the interface of Alamofire is a lot nicer than that of URLSession and consorts. Also, acceptance is not a measure of some abstract measure of goodness (let alone yours! ;) ) but of what helped the OP the most. (For "pure" solutions, there's SO Documentation!)

2015年8月11日 · Swift 4 and 5. HTTP POST request using URLSession API in Swift 4. func postRequest(username: String, password: String, completion: @escaping ([String: Any]?, Error?) -> Void) { //declare parameter as a dictionary which contains string as key and value combination.

2014年8月22日 · Swift 4 /// Takes the screenshot of the screen and returns the corresponding image /// /// - Parameter shouldSave: Boolean flag asking if the image needs to be saved to user's photo library. Default set to 'true' /// - Returns: (Optional)image captured as a screenshot open func takeScreenshot(_ shouldSave: Bool = true) -> UIImage? { var ...

2019年4月15日 · Silver is a free implementation of Apple's Swift programming language. With Silver, you can use Swift to write code directly against the .NET, Java, Android and Cocoa APIs. Elements is a compiler and development tool chain for Oxygene, C# and Swift which targets the .NET runtime, Java/Android virtual machines.

@VyachaslavGerchicov If you don’t know a simpler way for Swift, which was also specified in the question, then this would be the simplest way, even of you don’t consider it simple in a more general context that would include Objective-C. (Also, this answer is basically a one-line one-time definition of an enum, the function and its call is ...

Swift 4.2 var myArray: NSArray = [] let firstElement: String = "First element" let secondElement: String = "Second element" // Process to add the elements to the array myArray.adding(firstElement) myArray.adding(secondElement)

2016年1月12日 · Swift 4.2 or later Range and partial range subscripting using String 's indices property As variation of @LeoDabus nice answer , we may add an additional extension to DefaultIndices with the purpose of allowing us to fall back on the indices property of String when implementing the custom subscripts (by Int specialized ranges and partial ranges ...

2014年12月17日 · In Swift 4.2 and Xcode 10.1. You have 4 ways total to delay. Out of these option 1 is preferable to call or execute a function after some time.

Below is an example (for Swift 5.x) of a basic Timer object created when a UIButton is pressed. It uses a closure to print the current timer value to the log and eventually calls invalidate() to stop and remove the Timer from the run loop.