iOS Swift 将闭包作为属性传递

Swift
class NetworkManager {
    var completion: ((Bool) -> Void)?
    
    func fetchData() {
        // 模拟网络请求
        DispatchQueue.global().async {
            // 网络请求完成后调用闭包
            self.completion?(true)
        }
    }
}
class ViewController {
    let networkManager = NetworkManager()
    
    func setupNetworkManager() {
        networkManager.completion = { success in
            if success {
                print("网络请求成功")
            } else {
                print("网络请求失败")
            }
        }
    }
    
    func fetchData() {
        networkManager.fetchData()
    }
}
let viewController = ViewController()
viewController.setupNetworkManager()
viewController.fetchData()