Swift 优雅的前缀

总得说点什么

import Foundation

struct SwiftWrapper<Base> {
    var base: Base
    init(_ base: Base) {
        self.base = base
    }
}

protocol SwiftProtocol {}

extension SwiftProtocol {
    
    var swifter: SwiftWrapper<Self> {
        return SwiftWrapper(self)
    }
    
    static var swifter: SwiftWrapper<Self>.Type {
        return SwiftWrapper<Self>.self
    }
}

extension String: SwiftProtocol {  }
extension NSString: SwiftProtocol {  }

extension SwiftWrapper where Base: ExpressibleByStringLiteral {
    var numberCount: Int {
        var count = 0
        for c in (base as! String) where ("0"..."9").contains(c) {
            count += 1
        }
        return count
    }
    
    static func print() {
        Swift.print("static func")
    }
}

let string = "243786"
print(string.swifter.numberCount)
String.swifter.print()

下面有个小姐姐

https://www.youtube.com/watch?v=DJJ_721k5-g

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