如何在iOS8上以编程方式创建Today小部件而不使用storyboard？

Question

我试图删除故事板文件和相关Info.plist条目,但这次延期停止了工作; 它甚至没有从XCode启动.

The operation couldn’t be completed. (LaunchServicesError error 0.)

常规应用程序(包含应用程序)很容易,因为我们看到它的入口点和应用程序委托,但是如何在扩展程序上执行此操作？

Answer 1

我做了以下步骤:

• 从项目中删除storyboard文件
• 修改info.plist:

转到NSExtension Dictionary,删除此键:NSExtensionMainStoryboard.将其替换为此键NSExtensionPrincipalClass并将ViewController添加为值,例如TodayViewController.

之前:

<key>NSExtension</key>
<dict>
    <key>NSExtensionMainStoryboard</key>
    <string>MainInterface</string>
    <key>NSExtensionPointIdentifier</key>
    <string>com.apple.widget-extension</string>
</dict>

后:

<key>NSExtension</key>
<dict>
    <key>NSExtensionPrincipalClass</key>
    <string>TodayViewController</string>
    <key>NSExtensionPointIdentifier</key>
    <string>com.apple.widget-extension</string>
</dict>

• 如果您使用的是Swift,则必须在目标的Build Settings中启用"Embedded Content Contains Swift Code".将其设置为YES.
• 另外,我必须@objc (TodayViewController)在我的TodayViewController类中添加(在导入之后).

该应用程序应该立即运行.但我还有两件事要做:

• 创建一个视图.显然没有自动创建的视图.

所以添加这些行:

override func loadView()
{
    view = UIView(frame:CGRect(x:0.0, y:0, width:320.0, height:200.0))
}

• 并在viewDidLoad方法中设置窗口小部件的高度: self.preferredContentSize = CGSizeMake(0, 200)

Answer 2

NSExtensionMainStoryboard从Info.plist 添加中删除NSExtensionPrincipalClass = YourViewController

不要忘记创建自己的视图 loadView

Answer 3

FWIW, it didn't work for me until I added a prefix of the module name for my Swift view controller class, e.g.

<key>NSExtension</key>
<dict>
    <!-- ... -->
    <key>NSExtensionPrincipalClass</key>
    <string>SafariActionExtension.RootViewController</string>
    <!-- ... -->
</dict>

That is probably because class lookup for Swift modules turns module names into prefix for class name. E.g. to create your class in code you would write NSStringFromClass("SafariActionExtension.RootViewController"), hence the prefix.