Xcode 升级11 适配 ⚠️记录～

1、关闭暗黑模式 ,如果没有适配暗黑模式，在暗黑模式下会很丑

在Info.plist文件添加 
User Interface Style     ->    Light

关闭暗黑模式

2、 报错

• library not found for -lstdc++.6.0.9
  解决：用大佬写的脚本 https://github.com/devdawei/libstdc-

• [_LSDefaults sharedInstance]: unrecognized selector sent to class
  解决：友盟iOS13报错

3、 presentViewController适配

• 原因是iOS 13 多了一个新的枚举类型 UIModalPresentationAutomatic，并且是modalPresentationStyle的默认值。
  UIModalPresentationAutomatic实际是表现是在 iOS 13的设备上被映射成UIModalPresentationPageSheet。
  但是需要注意一点PageSheet 与 FullScreen 生命周期并不相同 FullScreen会走完整的生命周期
  ，PageSheet因为父视图并没有完全消失，所以viewWillDisappear及viewWillAppear并不会走，
  如果这些方法里有一些处理，还是换个方式，或者用FullScreen

一句话全局适配,摘自 简书猫爪

采用分类的形式，给 UIViewController 增加一个分类，写入方法
//Objective-C, 直接写在 .m 中
@implementation UIViewController (iOS13)

- (UIModalPresentationStyle)modalPresentationStyle{
    return UIModalPresentationFullScreen;
}
@end

4、 私有API被封禁(KVC限制),禁止访问

SearchBar

if ([[[UIDevice currentDevice]systemVersion] floatValue] >=13.0) {
       searchField = _vSearchBar.searchTextField;
   }else{
      searchField = [self valueForKey:@"_searchField"];
   }

修改TextFiled的占位符字体大小以及颜色

[_textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];
[_textField setValue:[UIFont systemFontOfSize:14] forKeyPath:@"_placeholderLabel.font"];

替换成
_textField.attributedPlaceholder = [[NSAttributedString alloc] 
initWithString:@"姓名" attributes:@{NSFontAttributeName:
[UIFont systemFontOfSize:14]
,NSForegroundColorAttributeName:[UIColor redColor]}];

5、UI调整

1. UISegmentedControl 修改选择背景色
   iOS13中 ，UISegmentedControl默认样式变为白底黑字

    if (@available(iOS 13.0, *)) {
            _segmented.selectedSegmentTintColor = Stock_Red;
        } else {
            _segmented.tintColor = Stock_Red;
        }

2. webview 全部要用WKWebview替换

6、新增SceneDelegate 适配

作用：据说为iPad的多进程准备的

1.方案 不需要适配ipad的应用，直接删掉

• 删除 SceneDelegate的文件
• 删除AppDelegate中关于SceneDelegate的函数
• 删除info.plist中的Application Scene Manifest选项
• 在AppDelegate中添加window属性

2. 要用到ipad的多线程的适配

• 只有iOS 13 后才启用有SceneDelegate及相关函数，@available(iOS 13.0, *)

• SceneDelegate 代码

@available(iOS 13.0, *)
class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?

   func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
  
        //需要用到多线程的时候      
        guard let windowScene = (scene as? UIWindowScene) else { return }
        
        let nav = YHNavigationController.init(rootViewController: HomeViewController())
             nav.view.backgroundColor = UIColor.white
             window = UIWindow.init(windowScene: windowScene)
             window?.rootViewController = nav
             window?.makeKeyAndVisible()
        
    }
}

• AppDelegate 代码

    // MARK: UISceneSession Lifecycle
    //使用 @available(iOS 13.0, *)进行判断，如果系统没到达13.0的话就不启用该段代码。
 @available(iOS 13.0, *)
    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        // Called when a new scene session is being created.
        // Use this method to select a configuration to create the new scene with.
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }
 @available(iOS 13.0, *)
    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
        // Called when the user discards a scene session.
        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
    }