Question

我试图在Xcode4中将App Delegate连接到View Controller，但由于某些原因我无法建立连接，因为App Delegate无法在可视对象编辑器中看到它。

在可视对象编辑器中添加了视图控制器，并将类ID更改为HelloWorldViewController，并在App Delegate.h和.m文件中添加了代码。

我做错了什么？

以下是代码：

testWindowBasedAppDelegate.h

// -- Add a forward reference to the HelloWorldViewController class --
@class HelloWorldViewController;

#import <UIKit/UIKit.h>

@interface testWindowBasedAppAppDelegate : NSObject <UIApplicationDelegate> {
    UIWindow *window;
    //-- create an instance of the view controller --
    HelloWorldViewController *viewController;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;

// -- expose the view controller as a property --
@property (nonatomic, retain) HelloWorldViewController *viewController; 

@end

testWindowBasedAppDelegate.m

#import "testWindowBasedAppAppDelegate.h"
#import "HelloWorldViewController.h"

@implementation testWindowBasedAppAppDelegate


@synthesize window;
//-- synthesize the property--
@synthesize viewController;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    //-- add the new view to the current window --
    [window addSubview:viewController.view];
    [self.window makeKeyAndVisible];
    return YES;
}

- (void)dealloc
{
    [viewController release];
    [window release];
    [super dealloc];
}

@end

Answer 1

您需要为IB添加IBOutlet标记才能看到它。将属性声明为，

@property (nonatomic, retain) IBOutlet HelloWorldViewController *viewController;

这甚至适用于您要公开的方法，但您将使用IBAction。例如，

- (IBAction)doSomething;

这两个标签都只是指标，实际上是声明为

#define IBAction void
#define IBOutlet

App Delegate无法查看View Controller

1 个答案: