You have to use a generic function where the parameter is only used for type information so you cast it to T: func doSomething<T>(_ a: Any, myType: T.Type) { if let a = a as? T { //… } } // usage doSomething(“Hello World”, myType: String.self) Using an initializer of the type T You don’t … Read more
If you want to execute that code only on iOS, then use #if os(iOS) instead of the if #available(iOS …). This way, you are not using a dynamic check for the version of your operating system, but are compiling a different code for one OS or the other.
Passing a Swift closure to a C function taking a function pointer parameter is now supported in Swift 2, and, as you noticed, function types are specified with the @convention(c) attribute. If you pass a closure directly as an argument to the C function then this attribute is inferred automatically. As a simple example, if … Read more
From the WWDC 2015 “Privacy and Your App” video, add the following to your info.plist file: <key>LSApplicationQueriesSchemes</key> <array> <string>fbauth</string> </array>
In Swift 2: You can use sort method, using compare to compare the two dates: let sortedArray = myArray.sort { $0.myDate.compare($1.myDate) == .OrderedAscending } // use `sorted` in Swift 1.2 Or, if you want to sort the original array, you can sortInPlace: myArray.sortInPlace { $0.myDate.compare($1.myDate) == .OrderedAscending } // use `sort` in Swift 1.2 In … Read more
I got a message from an Apple developer stating that they’ve observed this problem, and that it could be fixed by moving the .framework to a subfolder of the project. Apparently the module .. was built in directory error appears only if the .framework is in the same folder as the .xcodeproj aka $(PROJECT_DIR). However … Read more
These changes are recommended because if you don’t use these variables at all you should consider replacing it with ‘_’. So you (and other people) can later understand your intention more quickly. In terms of performance it would probably be just a minor improvement which you can’t notice at all. The same situation applies during … Read more
You could use a protocol composition: extension Moveable where Self: protocol<Animal, Aged> { // … } Or just add the conformances one after the other: extension Moveable where Self: Animal, Self: Aged { // … }
C-style for loop has been deprecated in Swift 3. You can continue using it for a while, but they will certainly disappear in the future. You can rewrite your loop to Swift’s style: for i in 0..<len { let length = UInt32 (letters.length) let rand = arc4random_uniform(length) randomString.appendFormat(“%C”, letters.characterAtIndex(Int(rand))) } Since you don’t use i … Read more
Xcode 10 with Swift 4.2 Looks like Apple engineers are listening let randomBool = Bool.random()