Initialize an NSObject and set up its properties with a block. Useful for class variables.

InitializerProtocol.swift

import UIKit

protocol Initializer {}
extension Initializer {
	func with(bootStrap: (inout Self) -> ()) -> Self {
		var s = self
		bootStrap(&s)
		return s
	}
}

extension NSObject: Initializer {}

let L = UILabel().with {
	$0.text = "freddie"
}
L.text // "freddie"


class Foo: Initializer {
	var name = ""
}

let f = Foo().with {
	$0.name = "bob"
}

f.name

struct Bar: Initializer {
	var name = ""
}

let b = Bar().with {
	$0.name = "Charlie"
}
b.name

// Also for sake of completion, an objective-c version
@interface NSObject (with)
- (instancetype)with:(void(^)(id))bootStrap;
@end
@implementation NSObject (with)

- (instancetype)with:(void(^)(id))bootStrap {
	bootStrap(self);
	return self;
}

@end