ios - viewDidLoad 之后如何创建/添加 UIView？

Question

我试图在收到网络请求的响应后创建按钮。如何执行此操作并在创建它们之后、加载 View 之后定位它们。我还以编程方式创建 View 并使用自动布局。

CustomView.swift

class CustomView: UIView {

    override init(frame: CGRect) {
        super.init(frame: UIScreen.main.bounds)
        backgroundColor = .red
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

}

ViewController.swift

// Load custom view
override func loadView() {
    view = CustomView()
}

override func viewDidLoad() {
    super.viewDidLoad()

    // Create buttons after getting response
    viewModel.output.apiOutput
        .subscribe(onNext: { posts in
            for post in posts {
                // create buttons
            }
        })
        .dispose(by: disposeBag)

}

Answer 1

/// Helper function to create a new button.
func createButton(_ title: String) -> UIButton {
    let button = UIButton()
    button.backgroundColor = .blue
    button.setTitle(title, .normal)

    // Add the button as a subview.
    self.view.addSubview(button)
}

override func viewDidLoad() {
    super.viewDidLoad()

    // Just set the viewController's view to your custom view here.
    self.view = CustomView()

    // Create buttons after getting response
    viewModel.output.apiOutput
        .subscribe(onNext: { posts in
            for post in posts {
                // Create a button. Change "title" to the title of your post, etc.
                let button = createButton("Title")
                // Constrain your button here!
            }
        })
        .dispose(by: disposeBag)
}

上面写着 //在此处约束您的按钮! - 如果您想要在行或列中放置多个按钮，我建议使用 UIStackView，并将它们添加为 ArrangedSubviews，例如。