swift 中 also 使用技巧

14 August 2025

Swift 中 also 使用技巧

also 定义

protocol Also {}
extension Also where Self: Any {

    @discardableResult
    func also(_ block: ((Self) -> Void)) -> Self {
        block(self)
        return self
    }
}

extension NSObject: Also {}

使用示例

label = UILabel().also {
            $0.font = .systemFont(ofSize: 12)
            $0.textColor = .white
            $0.numberOfLines = 1
            captionView.addSubview($0)
        }