1.Xcode13 必須用這個模式

File -> Workspace Setting ->New Build System
這個模式下項目中或有多余的md ,plist文件需要刪除

2.Building for iOS Simulator, but the linked framework 'xxxxx.framework' was built for iOS.

Build settings -> Vailidate Workspace 設(shè)置成YES

3.NavigationBar背景顏色失效，有的變白色，有的變黑色問題

     UINavigationBarAppearance *barApp = [UINavigationBarAppearance new];
        barApp.titleTextAttributes = @{NSForegroundColorAttributeName: [UIColor blackColor],
                                       NSFontAttributeName: [UIFont systemFontOfSize:16 weight:UIFontWeightMedium]};
        barApp.backgroundColor = UIColor.whiteColor;
        self.navigationController.navigationBar.scrollEdgeAppearance = barApp; // 可滑動界面配置
        self.navigationController.navigationBar.standardAppearance = barApp; // 普通頁面配置
    }else{
        self.navigationController.navigationBar.backgroundColor = UIColor.whiteColor;
        [self.navigationController.navigationBar setBarTintColor:UIColor.whiteColor];
        [self.navigationController.navigationBar setBackgroundImage:[UIImage imageWithColor:UIColor.whiteColor] forBarMetrics:(UIBarMetricsDefault)];
        [self.navigationController.navigationBar setShadowImage:[UIImage imageWithColor:UIColor.whiteColor]];
    }
    

4.UITableView新增sectionHeaderTopPadding會使表頭新增一段間隙，默認(rèn)為UITableViewAutomaticDimension

// 此為全局配置，可在AppDelegate中全局統(tǒng)一配置
if (@available(iOS 15.0, *)) {
        [UITableView appearance].sectionHeaderTopPadding = 0;
    }

// 此方法為單一設(shè)置某個tableview
  if (@available(iOS 15.0, *)) {
        _tableView.sectionHeaderTopPadding = 0;
    }

5.Encountered an error communicating with IBAgent-iOS.

解決方案如下：
重啟清理Xcode緩存，重啟Xcode。（如果依然存在，那就重啟清理完重啟下電腦。

TabBarItem失效

UITabBarItem *tabBarItem = [UITabBarItem appearance];
NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:DARKGRAYCOLOR,NSForegroundColorAttributeName,nil];
NSDictionary *selectAttributes =[NSDictionary dictionaryWithObjectsAndKeys:BLUECOLOR,NSForegroundColorAttributeName, nil];
    
if (@available(iOS 15.0, *)) {
    UITabBarAppearance * appearance = [UITabBarAppearance new];
    appearance.shadowColor = [UIColor clearColor];
    appearance.stackedLayoutAppearance.normal.titleTextAttributes = attributes;
    appearance.stackedLayoutAppearance.selected.titleTextAttributes = selectAttributes;
    self.tabBar.standardAppearance = appearance;
} else {
    [tabBarItem setTitleTextAttributes:attributes forState:UIControlStateNormal];
    [tabBarItem setTitleTextAttributes:selectAttributes forState:UIControlStateSelected];
}

6.增加UISheetPresentationController，通過它可以控制 Modal 出來的 UIViewController 的顯示大小，且可以通過拖拽手勢在不同大小之間進(jìn)行切換。只需要在跳轉(zhuǎn)的目標(biāo) UIViewController 做如下處理

UISheetPresentationController *presentation = [UISheetPresentationController new];
    // 顯示時支持的尺寸
    presentation.detents = @[UISheetPresentationControllerDetent.largeDetent,UISheetPresentationControllerDetent.mediumDetent]
    // 顯示一個指示器表示可以拖拽調(diào)整大小
    presentation.prefersGrabberVisible = YES;

7.UIImageWriteToSavedPhotosAlbum存儲圖片之后的回調(diào)不再返回圖片了，會返回nil，如果在回調(diào)方法里面操作image有可能會直接Crash，目前的解決辦法聲明一個全局image去記錄，后面再去操作

self.image = image;
UIImageWriteToSavedPhotosAlbum(image,self,@selector(image:didFinishSavingWithError:contextInfo:), NULL);
            
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
    // self.image doing...
}

8.iOS15 carplay無法鏈接

因為舊的MPPlayableContentManager 的api只支持到iOS14 ,iOS15強(qiáng)制使用carplay.framework和Scene Session api 去實現(xiàn)carplay功能導(dǎo)致iOS13以下carplay版本無法兼容