gunoooo/SwiftyBuilder

💡 Swifty Builder pattern

⛏ SwiftyBuilder

🔧 Installation

SwiftyBuilder is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'SwiftyBuilder'

🤷‍♂️ What is Builder Pattern

https://github.com/kingreza/Swift-Builder

🤔 How to use

Basic

• before

let view: UIView = {
    var view = UIView()
    view.backgroundColor = .black
    view.alpha = .zero
    return view
}()

• after

let view = UIView()
    .builder
    .backgroundColor(.black)
    .alpha(.zero)
    .build()

Freely set properties

• the value types

let array = [""]
    .builder
    .do {
        $0.append("Hello")
    }
    .build()

• NSObject subclasses

let button = UIButton()
    .builder
    .apply {
        $0.setTitle("Hello, World", for: .normal)
    }
    .build()

Extension

• before

let label = UILabel()
    .builder
    .font(.systemFont(ofSize: 10))
    .numberOfLines(12)
    .build()

print(label.numberOfLines) // 12

• extension

extension Builder where Base: UILabel {
    // custom
    func size(_ value: CGFloat) -> Self {
        return set(\.font, value: base.font.withSize(value))
    }
    
    // intercept
    func numberOfLines(_ value: Int) -> Self {
        return set(\.numberOfLines, value: min(value, 10))
    }
}

let label = UILabel()
    .builder
    .size(10)
    .numberOfLines(12)
    .build()

print(label.numberOfLines) // 10

Custom Builder

• declare

struct User: Buildable {
    var id: String?
    var name: String?
}

typealias UserBuilder = Builder<User>
// or
extension Builder where Base == User {}

• intercept

extension UserBuilder {
    func id(_ value: String) -> Self {
        return set(\.id, value: "ID : \(value)")
    }
}

let user = User()
    .builder
    .id("user")
    .build()
    
print(user.id!) // ID : user 

👀 References

https://github.com/devxoul/Then https://wilson-gramer-blog.github.io/posts/2020-02-23-using-dynamic-member-lookup-implement-builder-pattern.html

License

SwiftyBuilder is available under the MIT license. See the LICENSE file for more info.