Question

C＃上的noob问题 - 在下面的代码中，该行是什么

UIWindow window;

确切地说，它与行的关系是什么

window = new UIWindow (UIScreen.MainScreen.Bounds);

“UIWindow窗口”是某种变量声明吗？

public partial class AppDelegate : UIApplicationDelegate
{
    UIWindow window;
    HelloWorld_iPhoneViewController viewController;

    /// <summary>
    /// This method is invoked when the application has loaded and is ready to run. In this 
    /// method you should instantiate the window, load the UI into it and then make the window
    /// visible.
    /// </summary>
    /// <remarks>
    /// You have 5 seconds to return from this method, or iOS will terminate your application.
    /// </remarks>
    public override bool FinishedLaunching (UIApplication app, NSDictionary options)
    {
        // create a new window instance based on the screen size
        window = new UIWindow (UIScreen.MainScreen.Bounds);


        viewController = new HelloWorld_iPhoneViewController ("HelloWorld_iPhoneViewController", null);
        window.RootViewController = viewController;
        window.MakeKeyAndVisible ();

        return true;
    }
}

Answer 1

这行代码声明了一个名为window的{{1}}类型的变量（其值最初为null）：

UIWindow

此行为UWindow window;变量赋值：

window

Answer 2

UIWindow window;

这会创建一个UIWindow

类型的新变量

window = new UIWindow (UIScreen.MainScreen.Bounds);

这会初始化窗口变量，在调用此行之前它为null。

c＃变量声明中“单个空格”的含义？

2 个答案: