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Swift singletons are exposed in the Cocoa frameworks as class functions, e.g. NSFileManager.defaultManager(), NSNotificationCenter.defaultCenter(), so I feel it makes more sense as a class function to mirror this behaviour, rather than a class variable as some other solutions use, e.g.

class MyClass {

    private static let _sharedInstance = MyClass()

    class func sharedInstance() -> MyClass {
        return _sharedInstance
    }
}

Retrieve the singleton via MyClass.sharedInstance().

Swift singletons are exposed in the Cocoa frameworks as class functions, e.g. NSFileManager.defaultManager(), NSNotificationCenter.defaultCenter(). So it makes more sense as a class function to mirror this behavior, rather than a class variable as some other solutions. e.g:

class MyClass {

    private static let _sharedInstance = MyClass()

    class func sharedInstance() -> MyClass {
        return _sharedInstance
    }
}

Retrieve the singleton via MyClass.sharedInstance().

Swift Singletons are exposed in the cocoa frameworks as class functions, e.g. NSFileManager.defaultManager(), NSNotificationCenter.defaultCenter(), so I feel it makes more sense as a class function to mirror this behaviour, rather than a class variable as some other solutions use e.g.

class MyClass {

    private static let _sharedInstance = MyClass()

    class func sharedInstance() -> MyClass {
        return _sharedInstance
    }
}

Retrieve the singleton via MyClass.sharedInstance()

Swift singletons are exposed in the Cocoa frameworks as class functions, e.g. NSFileManager.defaultManager(), NSNotificationCenter.defaultCenter(), so I feel it makes more sense as a class function to mirror this behaviour, rather than a class variable as some other solutions use, e.g.

class MyClass {

    private static let _sharedInstance = MyClass()

    class func sharedInstance() -> MyClass {
        return _sharedInstance
    }
}

Retrieve the singleton via MyClass.sharedInstance().

Swift Singletons are exposed in the cocoa frameworks as class functions, e.g. NSFileManager.defaultManager(), NSNotificationCenter.defaultCenter(), so I feel it makes more sense as a class function to mirror this behaviour, rather than a class variable as some other solutions use e.g.

private let _sharedInstance = MyClass()
 
class MyClass {
    class func sharedInstance() -> MyClass {
        return _sharedInstance
    }
}

Retrieve the singleton via MyClass.sharedInstance()

Swift Singletons are exposed in the cocoa frameworks as class functions, e.g. NSFileManager.defaultManager(), NSNotificationCenter.defaultCenter(), so I feel it makes more sense as a class function to mirror this behaviour, rather than a class variable as some other solutions use e.g.

class MyClass {

    private static let _sharedInstance = MyClass()

    class func sharedInstance() -> MyClass {
        return _sharedInstance
    }
}

Retrieve the singleton via MyClass.sharedInstance()