Top "Swift4" questions

How do I write dispatch_after GCD in Swift 3, 4, and 5?

In Swift 2, I was able to use dispatch_after to delay an action using grand central dispatch: var dispatchTime: dispatch_…

swift swift4 grand-central-dispatch swift5

How can I use String substring in Swift 4? 'substring(to:)' is deprecated: Please use String slicing subscript with a 'partial range from' operator

I have the following simple code written in Swift 3: let str = "Hello, playground" let index = str.index(of: ",")! let newStr = …

swift swift4

Command CompileSwift failed with a nonzero exit code in Xcode 10

Good afternoon, After updating to the latest version of Xcode at the moment (version 10.0) the project is unable to build …

ios swift xcode swift4 xcode10

The use of Swift 3 @objc inference in Swift 4 mode is deprecated?

Briefly, while using Xcode 9 Beta, I have run into the following warning: The use of Swift 3 @objc inference in Swift 4 …

swift swift4 xcode9-beta

Module compiled with Swift 4.0 cannot be imported in Swift 4.0.1

However I have recompiled the framework using the same Xcode and it still gives me this error. Base SDK iOS 11.1 …

ios swift xcode xcode9 swift4

How to decode a property with type of JSON dictionary in Swift [45] decodable protocol

Let's say I have Customer data type which contains a metadata property that can contains any JSON dictionary in the …

json swift swift4 codable

Codable class does not conform to protocol Decodable

Why am I getting a "Type 'Bookmark' does not conform to protocol 'Decodable'" error message? class Bookmark: Codable { weak var …

swift swift4 codable decodable

How can I use Swift’s Codable to encode into a dictionary?

I have a struct that implements Swift 4’s Codable. Is there a simple built-in way to encode that struct into …

swift swift4 codable

warning: 'characters' is deprecated: Please use String or Substring directly

characters - an instance property of String, is deprecated from with Xcode 9.1 It was very useful to get a substring …

ios string substring swift4 xcode9.1

Swift JSONDecode decoding arrays fails if single element decoding fails

While using Swift4 and Codable protocols I got the following problem - it looks like there is no way to …

arrays json swift swift4 codable