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                # IOS通用應用程序 ## 簡介 通用的應用程序是為iPhone和iPad在一個單一的二進制文件中設計的應用程序。這有助于代碼重用,并能夠幫助更快進行更新。 ### 實例步驟 1、創建一個簡單的View based application(視圖應用程序) 2、在文件查看器的右邊,將文件ViewController.xib的文件名稱更改為ViewController_iPhone.xib,如下所示 ![UniversalAppInterfaceRename](https://box.kancloud.cn/2015-12-13_566ce89f65095.jpg) 3、選擇"File -&gt; New -&gt; File... ",然后選擇User Interface,再選擇View,單擊下一步 ![NewIpadXib](https://box.kancloud.cn/2015-12-13_566ce8a002312.jpg) 4、選擇iPad作為設備,單擊下一步: ![UniversalAppSelectDeviceType](https://box.kancloud.cn/2015-12-13_566ce8a091f00.jpg) 5、將該文件另存為ViewController_iPad.xib,然后選擇創建 6、在ViewController_iPhone.xib和ViewController_iPad.xibd的屏幕中心添加標簽 7、在ViewController_iPhone.xib中選擇identity inspector,設置custom class為ViewController ![UniversalAppSetClass](https://box.kancloud.cn/2015-12-13_566ce8a11012b.jpg) 8、更新AppDelegate.m中的 application:DidFinishLaunching:withOptions方法 ``` - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; // Override point for customization after application launch. if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) { self.viewController = [[ViewController alloc] initWithNibName:@"ViewController_iPhone" bundle:nil]; } else{ self.viewController = [[ViewController alloc] initWithNibName: @"ViewController_iPad" bundle:nil]; } self.window.rootViewController = self.viewController; [self.window makeKeyAndVisible]; return YES; } ``` 9、在項目摘要中更新設備中為universal,如下所示: ![UniversalAppSetDevices](https://box.kancloud.cn/2015-12-13_566ce8a12ab67.jpg) ### 輸出 運行該應用程序,我們會看到下面的輸出 ![UniversalAppiPhone_Output](https://box.kancloud.cn/2015-12-13_566ce8a1c06e0.jpg) 在iPad模擬器中運行應用程序,我們會得到下面的輸出: ![UniversalAppiPad_Output](https://box.kancloud.cn/2015-12-13_566ce8a224bd9.jpg)
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