[swift-evolution] Customized Inline Init Closure

[Thorsten Seitz]

Very nice! 
I also think that using $0 is fine as it avoids all the problems with shadowing the outer self and thereby avoids erros and increases readability.

-Thorsten 

> Am 04.01.2016 um 18:51 schrieb Jo Albright via swift-evolution <swift-evolution at swift.org>:
> 
> Here is another option. Attached is a playground I was messing around with. There are some weird bugs I was noticing, but don’t quite know if they are important enough to submit (comment out line 54 to see).
> 
> I actually like using the $0 so as to allow access to self if using within another type (ex: view controller code below).
> 
> Please respond with any potential issues with the code I have written.
> 
> - Jo
> 
> 
> 
> protocol ClosureInit { init() }
> 
> extension ClosureInit {
> 
>     init(@noescape b: inout Self -> Void) { self.init(); b(&self) }
>     
> }
> 
> struct Person: ClosureInit {
>     
>     enum GenderType: String { case Male, Female }
>     
>     var age: Int = 0
>     var gender: GenderType?
>     var name: String?
>     
> }
> 
> let me = Person {
>     
>     $0.name = "Jo"
>     $0.age = 32
>     $0.gender = .Male
>     
> }
> 
> me.age // 32
> 
> extension Array: ClosureInit { }
> 
> let randomIntArray = [Int] {
>     
>     for _ in 0...10 {
>         
>         $0.append(Int(arc4random_uniform(100)))
>         
>     }
>     
> }
> 
> randomIntArray
> 
> let personArray = [Person] {
> 
>     for _ in 0...8 {
>         
>         $0.append(Person {
>             
>             $0.age = Int(arc4random_uniform(100))
>             $0.gender = Int(arc4random_uniform(100)) % 2 == 0 ? .Male : .Female // comment this line out to see error
>             
>             
>         })
>         
>     }
> 
> }
> 
> personArray
> 
> extension UIView: ClosureInit { }
> 
> class ViewController: UIViewController {
>     
>     override func viewDidLoad() {
>         super.viewDidLoad()
>         
>         UILabel {
>             
>             $0.text = "This is Awesome!"
>             $0.textColor = UIColor.cyanColor()
>             $0.frame = CGRect(x: 20, y: 20, width: view.frame.width - 40, height: 40)
>             view.addSubview($0)
>             
>         }
>         
>         view.addSubview(UIButton {
>             
>             $0.setTitle("Submit", forState: .Normal)
>             $0.frame = CGRect(x: 20, y: 60, width: view.frame.width - 40, height: 40)
>             
>         })
>         
>         
>     }
>     
> }
> 
> let vc = ViewController()
> 
> vc.loadViewIfNeeded()
> 
> vc.view.subviews
> 
> 
> <ClosureInit.playground.zip>
> 
> 
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