Swift 语言响应式编程与 UI 的结合和优化

Swift 语言中的响应式编程^【1】与 UI 结合与优化

在移动应用开发中，响应式编程与 UI 设计的结合是构建流畅、交互性强的用户界面的关键。Swift 语言作为苹果官方的编程语言，提供了强大的功能来支持响应式编程和 UI 开发。本文将探讨如何在 Swift 中结合响应式编程和 UI 设计，并介绍一些优化技巧。

响应式编程（Reactive Programming）是一种编程范式，它允许开发者以声明式的方式处理异步数据流。在 Swift 中，响应式编程通过使用 Combine 框架来实现。UI 设计则是指用户界面的布局、风格和交互设计。将这两者结合起来，可以创建出既美观又高效的移动应用。

响应式编程在 Swift 中的实现

Combine 框架

Combine 是 Swift 5.0 引入的一个响应式编程框架，它允许开发者以声明式的方式处理异步数据流。Combine 提供了丰富的操作符^【2】来处理数据流，如 `map^【3】`、`filter^【4】`、`subscribe` 等。

以下是一个简单的例子，展示如何使用 Combine 来处理一个按钮点击事件^【5】：

swift import Combine


class ViewController: UIViewController {

    var cancellables = Set()
    override func viewDidLoad() {

        super.viewDidLoad()

        let button = UIButton(frame: CGRect(x: 100, y: 100, width: 100, height: 50))

        button.setTitle("Click Me", for: .normal)

        button.backgroundColor = .blue

        button.addTarget(self, action: selector(buttonTapped), for: .touchUpInside)

        view.addSubview(button)
        button.publisher(for: .touchUpInside)

            .sink { _ in

                print("Button was tapped!")

            }

            .store(in: &cancellables)

    }

@objc func buttonTapped() { // Button tapped logic } }

在这个例子中，我们创建了一个按钮，并使用 `Publisher^【6】(for:)` 方法创建了一个按钮点击事件的发布者。然后，我们使用 `sink` 操作符订阅了这个发布者，每当按钮被点击时，都会打印一条消息。

信号^【7】与观察者^【8】

在响应式编程中，信号（Signal）是数据的载体，而观察者（Observer）是接收数据并做出响应的对象。Combine 框架中的 `Publisher` 和 `Subscriber^【9】` 就是信号和观察者的抽象。

使用操作符

Combine 提供了丰富的操作符来处理数据流，例如：

- `map`: 将输入数据映射到新的数据。
- `filter`: 过滤掉不符合条件的数据。
- `debounce^【10】`: 在指定时间内忽略连续的输入。
- `throttle^【11】`: 在指定时间内只发出一个值。

以下是一个使用 `map` 和 `filter` 操作符的例子：

swift button.publisher(for: .touchUpInside) .map { _ in "Button was tapped" } .filter { $0.count > 10 } .sink { value in print(value) } .store(in: &cancellables)

在这个例子中，每当按钮被点击时，我们都会打印出一条消息，但只有当消息的长度大于 10 个字符时。

UI 设计与响应式编程的结合

动画与响应式编程

动画是 UI 设计中不可或缺的一部分。在 Swift 中，可以使用 Combine 来创建响应式的动画。以下是一个简单的例子，展示如何使用 Combine 来创建一个响应式动画^【12】：

```swift
import UIKit
import Combine

class ViewController: UIView^【13】Controller {
var cancellables = Set()

override func viewDidLoad() {
super.viewDidLoad()
let view = UIView(frame: CGRect^【14】(x: 100, y: 100, width: 100, height: 100))
view.backgroundColor = .red
view.layer.cornerRadius^【15】 = 50
view.clipsToBounds^【16】 = true
view.translatesAutoresizingMaskIntoConstraints^【17】 = false
view.centerYAnchor^【18】.constraint(equalTo: view.safeAreaLayoutGuide^【19】.centerYAnchor).isActive = true
view.centerXAnchor^【20】.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.layer.borderWidth^【21】 = 5
view.layer.borderColor^【22】 = UIColor.blue.cgColor
view.layer.shadowColor^【23】 = UIColor.black.cgColor
view.layer.shadowOpacity^【24】 = 0.5
view.layer.shadowOffset^【25】 = CGSize(width: 0, height: 5)
view.layer.shadowRadius^【26】 = 5
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor).isActive = true
view.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
view.translatesAutoresizingMaskIntoConstraints = false
view.centerYAnchor.constraint(equalTo: view

Swift 语言响应式编程与 UI 的结合和优化

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VB.NET语言 项目技术债务的评估与处理

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VB.NET语言项目技术债务的评估与处理

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