Xcode11

【W(wǎng)WDC2019 Session】Xcode 11新特性
Xcode官方文檔

iOS13的特性

眾多新功能，隨iOS13而來(lái)。

iOS13的適配

1. SceneDelegate

• In iOS 13 and later, use UISceneDelegate objects to respond to life-cycle events in a scene-based app.
• In iOS 12 and earlier, use the UIApplicationDelegate object to respond to life-cycle events.

Q: 基于Xcode11新建的工程，在iOS13以前的版本不展示window，如何解決？
A：在AppDelegate.h 中添加window:

@property (strong, nonatomic) UIWindow *window;

• 如果不使用場(chǎng)景功能，在info.plist文鍵中刪除Application Scene Manifast。
  
• 注釋掉AppDelegate中 UISceneSession lifecycle

//- (UISceneConfiguration *)application:(UIApplication *)application configurationForConnectingSceneSession:(UISceneSession *)connectingSceneSession options:(UISceneConnectionOptions *)options {
//    // Called when a new scene session is being created.
//    // Use this method to select a configuration to create the new scene with.
//    return [[UISceneConfiguration alloc] initWithName:@"Default Configuration" sessionRole:connectingSceneSession.role];
//}
//
//
//- (void)application:(UIApplication *)application didDiscardSceneSessions:(NSSet<UISceneSession *> *)sceneSessions {
//    // 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.
//}

2. 不允許使用 valueForKey、setValue: forKey 獲取和設(shè)置私有屬性;

// crash代碼 
[tf setValue:[UIColor greenColor] forKeyPath:@"_placeholderLabel.textColor"];
[tf setValue:[UIFont systemFontOfSize:12.f] forKeyPath:@"_placeholderLabel.font"];

// 修復(fù)代碼
tf.attributedPlaceholder = [[NSMutableAttributedString alloc] initWithString:tf.placeholder attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:12.f],NSForegroundColorAttributeName:[UIColor redColor]}];

(注意: 使用富文本修改placeholder時(shí), tf.placeholder不能為空.)

// crash代碼
UIButton *cancelBtn = [searchBar valueForKey:@"_cancelButton"];

// 修復(fù)代碼 (不建議)
UIButton *cancelBtn = [searchBar valueForKey:@"cancelButton"];

// 獲取狀態(tài)欄視圖 crash
UIView *statusBar = [[[UIApplication sharedApplication] valueForKey:@"statusBarWindow"] valueForKey:@"statusBar"];

3. 控制器的 modalPresentationStyle 新增UIModalPresentationAutomatic, 且在iOS13上被設(shè)置為默認(rèn)值;

iOS13效果:

4. 之前標(biāo)記為 API_DEPRECATED 部分類被移除

• MPMoviePlayerController ==> AVPlayerViewController

• UISearchDisplayController ==> UISearchController

• UIAlertView

5. Sign in with Apple

• 使用 Sign in with Apple 會(huì)更加方便、快捷、安全，蘋果不會(huì)追蹤用戶在應(yīng)用中的行為。所以，對(duì)于用戶來(lái)說(shuō)使用 Sign in with Apple 會(huì)更加安全。
• App 沒(méi)有提供第三方登錄，不需要集成。如果用到了第三方登錄，那么需要提供 Sign in with Apple，而且必須放在最前面。
  集成 Sign in with Apple 功能.

6. 即將廢棄的 LaunchImage

iOS 8 之前我們是在 LaunchImage 來(lái)設(shè)置啟動(dòng)圖，但是隨著蘋果設(shè)備尺寸越來(lái)越多，我們需要在對(duì)應(yīng)的 aseets 里面放入所有尺寸的啟動(dòng)圖，這是非常繁瑣的一個(gè)步驟。因此在 iOS 8 蘋果引入了 LaunchScreen.storyboard，支持界面布局用的 AutoLayout + SizeClass ，可以很方便適配各種屏幕。

需要注意的是，蘋果在 Modernizing Your UI for iOS 13 section 中提到
，從2020年4月開始，所有支持 iOS 13 的 App 必須提供 LaunchScreen.storyboard，否則將無(wú)法提交到 App Store 進(jìn)行審批。

7. DeviceToken 獲取

// 以前的
- (void)application:(UIApplication*)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData*)deviceToken {
    /// Required - 注冊(cè) DeviceToken
    [JPUSHService registerDeviceToken:deviceToken];
}

// iOS13
- (void)application:(UIApplication *)application
    didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
  const unsigned int *tokenBytes = [deviceToken bytes];
  NSString *tokenString = [NSString stringWithFormat:@"%08x%08x%08x%08x%08x%08x%08x%08x",
                        ntohl(tokenBytes[0]), ntohl(tokenBytes[1]), ntohl(tokenBytes[2]),
                        ntohl(tokenBytes[3]), ntohl(tokenBytes[4]), ntohl(tokenBytes[5]),
                        ntohl(tokenBytes[6]), ntohl(tokenBytes[7])];
  rootViewController.deviceTokenValueLabel.text = tokenString;
  rootViewController.deviceTokenValueLabel.textColor =
      [UIColor colorWithRed:0.0 / 255
                      green:122.0 / 255
                       blue:255.0 / 255
                      alpha:1];
  NSLog(@"Device Token: %@", tokenString);
  [JPUSHService registerDeviceToken:deviceToken];
}

https://developer.umeng.com/docs/66632/detail/126489

8. UISegmentedControl 默認(rèn)樣式改變

iOS13以前:

iOS13:

9. 藍(lán)牙需要新增權(quán)限描述

iOS13 以后廢棄 NSBluetoothPeripheralUsageDescription,
iOS13新增 NSBluetoothAlwaysUsageDescription;

10. 廢棄UIWebview APIs

從 iOS13 開始蘋果將 UIWebview 列為過(guò)期API。 目前提交蘋果應(yīng)用市場(chǎng)（App Store）會(huì)反饋以下郵件提示：

ITMS-90809: Deprecated API Usage - Apple will stop accepting submissions of apps that use UIWebView APIs .
See developer.apple.com/documentati… for more information.

11. CNCopyCurrentNetworkInfo 變化

 An app that fails to meet any of the above requirements receives the following return value:

- An app linked against iOS 12 or earlier receives a dictionary with pseudo-values. In this case, the SSID is Wi-Fi (or WLAN in the China region), and the BSSID is 00:00:00:00:00:00.
- An app linked against iOS 13 or later receives NULL.

iOS13 以后只有開啟了 Access WiFi Information capability，才能獲取到 SSID 和 BSSID

12. Dark Mode

Apps on iOS 13 are expected to support dark mode
Use system colors and materials
Create your own dynamic colors and images Leverage flexible infrastructure

• 不適配暗黑模式情況下處理方式:

方法一: 修改代碼
if (@available(iOS 13.0, *)) {
    [UIApplication sharedApplication].keyWindow.overrideUserInterfaceStyle = UIUserInterfaceStyleLight;
} 

方法二: 修改info.plist
<key>UIUserInterfaceStyle</key>
<string>Light</string>

UIUserInterfaceStyle

• 適配暗黑模式:

使用 QMUITheme 實(shí)現(xiàn)換膚并適配 iOS 13 Dark Mode

千里之行，始于足下。

參考文檔:
【W(wǎng)WDC2019 Session】Xcode 11新特性
Xcode官方文檔
眾多新功能，隨iOS13而來(lái)。
集成 Sign in with Apple 功能.
適配 iOS13（持續(xù)更新）
使用 QMUITheme 實(shí)現(xiàn)換膚并適配 iOS 13 Dark Mode