iOS14 适配简单总结

1.首先 Xcode 升级后就是一些警告

如：
The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment target versions for this platform is 9.0 to 14.0
每次升级 Xcode，苹果提高了最低版本，基本都会有这个警告
解决：删除 Pods、 Podfile.lock、xcworkspace 文件，然后重新 pod install，
或者直接在 Podfile 文件最后添加判断，然后 pod install

post_install do |installer|
  installer.pods_project.targets.each do |target|
    target.build_configurations.each do |config|
      if config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'].to_f < 10.0
        config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '10.0'
     end
   end
  end
end

参考

2.iOS14 隐私适配及部分解决方案

参考：iOS14 隐私适配及部分解决方案
或者：iOS 常用权限的获取及基本使用

3. UITableViewCell 添加子控件

需要使用 [cell.contentView addSubview:]; 的方式添加

4. UITableViewHeaderFooterView 设置透明背景无效

由于 iOS 14 新增 backgroundConfiguration 方式修改背景

        if #available(iOS 14.0, *) {
            self.backgroundConfiguration = UIBackgroundConfiguration.clear()
        } else {
            // Fallback on earlier versions
        }

5.UICollectionViewCell gestureRecognizers 为空

如果有用到此方法需要注意，比如在这个 bug 就出现了问题
iOS 14 前会有 UILongPressGestureRecognizer
iOS 14 后为空

6. UIWebView 禁止使用问题

cd 到工程根目录，全局搜索工程是否含有

grep -r UIWebView .

IPA 包搜索：

IPA：
cd payload/xxx.app
nm ./myapp | grep UIWebView
包含的字符
strings ./* | grep 'UIWebView'

7.keyWindow 获取

UIApplication.shared.keyWindow在 iOS 13 就已经废弃了
可以这样获取

// 方式1
        if #available(iOS 13.0, *) {
            let keyWindow = UIApplication.shared.connectedScenes
                .filter({ $0.activationState == .foregroundActive })
                .map({ $0 as? UIWindowScene })
                .compactMap({ $0 })
                .first?.windows
                .filter({ $0.isKeyWindow }).first
        } else {
            // Fallback on earlier versions
            let keyWindow = UIApplication.shared.keyWindow
        }
// 方式2
let keyWindow = UIApplication.shared.windows.filter { $0.isKeyWindow }.first
// 方式3
let keyWindow = UIApplication.shared.windows.first { $0.isKeyWindow }

8. Mac 升级到 Big Sur, Homebrew 警告, 报错

Traceback (most recent call last):
    11: from /usr/local/Homebrew/Library/Homebrew/brew.rb:23:in `<main>'
    10: from /usr/local/Homebrew/Library/Homebrew/brew.rb:23:in `require_relative'
     9: from /usr/local/Homebrew/Library/Homebrew/global.rb:37:in `<top (required)>'
     8: from /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
     7: from /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
     6: from /usr/local/Homebrew/Library/Homebrew/os.rb:3:in `<top (required)>'
     5: from /usr/local/Homebrew/Library/Homebrew/os.rb:21:in `<module:OS>'
     4: from /usr/local/Homebrew/Library/Homebrew/os/mac.rb:58:in `prerelease?'
     3: from /usr/local/Homebrew/Library/Homebrew/os/mac.rb:24:in `version'
     2: from /usr/local/Homebrew/Library/Homebrew/os/mac.rb:24:in `new'
     1: from /usr/local/Homebrew/Library/Homebrew/os/mac/version.rb:26:in `initialize'
/usr/local/Homebrew/Library/Homebrew/version.rb:368:in `initialize': Version value must be a string; got a NilClass () (TypeError)

解决：brew update-reset
升级到最新版即可
参考

9.Ignoring ffi-1.12.2 because its extensions are not built. Try: gem pristine ffi --version 1.12.2

上面虽然解决了问题，但还会有多余的打印信息或警告。
根据提示进行 gem pristine ffi --version 1.12.2
但是发现没有作用，我们需要给上权限即可：

sudo gem pristine ffi --version 1.12.2

10.粘贴板设置字符串为空微信分享无法拉起分享列表

目前不想让粘贴板提示的方式就是进入 app 后

UIPasteboard.general.string = ""

但是我们再退出 app （applicationWillResignActive）的时候也这样设置了，导致微信不能分享给朋友，朋友圈等。看来微信有用到和判断。

11.popToRootViewController TabBar 消失

解决1: popToRootViewController(animated: false)，没有动画体验会差
解决2: 重写 popToRootViewController 方法

override func popToRootViewController(animated: Bool) -> [UIViewController]? {
    guard #available(iOS 14, *) else {
      return super.popToRootViewController(animated: animated)
    }
     
    viewControllers.forEach({$0.hidesBottomBarWhenPushed = false})
    return super.popToRootViewController(animated: animated)
}