iOS 15-适配要点

yungfan· 2021-07-23
  1. 增加UISheetPresentationController,通过它可以控制 Modal 出来的 UIViewController 的显示大小,且可以通过拖拽手势在不同大小之间进行切换。只需要在跳转的目标 UIViewController 做如下处理:

    if let presentationController = presentationController as? UISheetPresentationController {
       // 显示时支持的尺寸
       presentationController.detents = [.medium(), .large()]
       // 显示一个指示器表示可以拖拽调整大小
       presentationController.prefersGrabberVisible = true
    }
  2. UIButton支持更多配置。UIButton.Configuration是一个新的结构体,它指定按钮及其内容的外观和行为。它有许多与按钮外观和内容相关的属性,如cornerStyle、baseForegroundColor、baseBackgroundColor、buttonSize、title、image、subtitle、titlePadding、imagePadding、contentInsets、imagePlacement等。

    // Plain
    let plain = UIButton(configuration: .plain(), primaryAction: nil)
    plain.setTitle("Plain", for: .normal)
    // Gray
    let gray = UIButton(configuration: .gray(), primaryAction: nil)
    gray.setTitle("Gray", for: .normal)
    // Tinted
    let tinted = UIButton(configuration: .tinted(), primaryAction: nil)
    tinted.setTitle("Tinted", for: .normal)
    // Filled
    let filled = UIButton(configuration: .filled(), primaryAction: nil)
    filled.setTitle("Filled", for: .normal) 

    Snipaste_2021-07-11_15-26-55.png 16259886795922.png

  3. 推出CLLocationButton用于一次性定位授权,该内容内置于CoreLocationUI模块,但如果需要获取定位的详细信息仍然需要借助于CoreLocation

    let locationButton = CLLocationButton()
    // 文字
    locationButton.label = .currentLocation
    locationButton.fontSize = 20
    // 图标
    locationButton.icon = .arrowFilled
    // 圆角
    locationButton.cornerRadius = 10
    // tint
    locationButton.tintColor = UIColor.systemPink
    // 背景色
    locationButton.backgroundColor = UIColor.systemGreen
    // 点击事件,应该在在其中发起定位请求
    locationButton.addTarget(self, action: #selector(getCurrentLocation), for: .touchUpInside)
  4. URLSession 推出支持 async/await 的 API,包括获取数据、上传与下载。

    // 加载数据
    let (data, response) = try await URLSession.shared.data(from: url)
    // 下载
    let (localURL, _) = try await session.download(from: url)
    // 上传
    let (_, response) = try await session.upload(for: request, from: data)
  5. 系统图片支持多个层,支持多种渲染模式。

    // hierarchicalColor:多层渲染,透明度不同
    let config = UIImage.SymbolConfiguration(hierarchicalColor: .systemRed)
    let image = UIImage(systemName: "square.stack.3d.down.right.fill", withConfiguration: config)
    // paletteColors:多层渲染,设置不同风格
    let config2 = UIImage.SymbolConfiguration(paletteColors: [.systemRed, .systemGreen, .systemBlue])
    let image2 = UIImage(systemName: "person.3.sequence.fill", withConfiguration: config2)
  6. UINavigationBar、UIToolbar 和 UITabBar 设置颜色,需要使用 UIBarAppearance APIs。

    // UINavigationBar
    let navigationBarAppearance = UINavigationBarAppearance()
    navigationBarAppearance.backgroundColor = .red
    navigationController?.navigationBar.scrollEdgeAppearance = navigationBarAppearance
    navigationController?.navigationBar.standardAppearance = navigationBarAppearance
    // UIToolbar
    let toolBarAppearance = UIToolbarAppearance()
    toolBarAppearance.backgroundColor = .blue
    navigationController?.toolbar.scrollEdgeAppearance = toolBarAppearance
    navigationController?.toolbar.standardAppearance = toolBarAppearance
    // UITabBar
    let tabBarAppearance = UITabBarAppearance()
    toolBarAppearance.backgroundColor = .purple
    tabBarController?.tabBar.scrollEdgeAppearance = tabBarAppearance
    tabBarController?.tabBar.standardAppearance = tabBarAppearance
  7. UITableView 新增了属性 sectionHeaderTopPadding,会给每一个section 的 header 增加一个默认高度。

    tableView.sectionHeaderTopPadding = 0
  8. UIImage 新增了几个调整尺寸的方法。

    // preparingThumbnail
    UIImage(named: "sv.png")?.preparingThumbnail(of: CGSize(width: 200, height: 100))
    // prepareThumbnail,闭包中直接获取调整后的UIImage
    UIImage(named: "sv.png")?.prepareThumbnail(of: CGSize(width: 200, height: 100)) { image in
        // 需要回到主线程更新UI
    }
    // byPreparingThumbnail
    await UIImage(named: "sv.png")?.byPreparingThumbnail(ofSize: CGSize(width: 100, height: 100))

文中代码已在 Xcode 13 Beta3 中测试通过, 案例源代码下载地址