Question

希望有人可以帮助我，这让我完全难过

我的应用程序在标签栏中有两个视图控制器......

//Create two view controllers
UIViewController *vc1 = [[RecordingViewController alloc] init];
UIViewController *vc2 = [[SavedViewController alloc] init];//this is a tableViewController

//Make an array with the two view controllers
NSArray *viewControllers = [NSArray arrayWithObjects:vc1, vc2, nil];

//Release the two view controllers since they are now retained by the array
[vc1 release];
[vc2 release];

//Attach the ViewControllers to the tabBar
[tabBarController setViewControllers:viewControllers];

然后我有另一个对象（fileHandler）想要将一个名为capture的对象发送到vc2以添加到NSMutableArray，所以从我发送的那个类开始。 ..

[vc2 addToCapturesArray:capture];

当然这不起作用，我只是从编译器得到“vc2 unclared”消息。如何让我的fileHandler课了解vc2实例？在此先感谢您的帮助。

感谢您的帮助。它现在都编译，但是vc2中的方法没有被调用由于某些原因。代码现在看起来像这样......

    @interface Rolling_VideoAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;

//Tab bar
UITabBarController *tabBarController;

//Create an ivar so that the app delegate can hold a reference
SavedViewController *_vc2;

} @property（非原子，保留）IBOutlet UIWindow *窗口; //创建一个属性，以便我们可以从外部访问vc2 @property（非原子，保留）SavedViewController * vc2;

#import "Rolling_VideoAppDelegate.h"

//Import view controllers
#import "RecordingViewController.h"
#import "SavedViewController.h"

@implementation Rolling_VideoAppDelegate

@synthesize window;
@synthesize vc2 = _vc2;

#pragma mark -
#pragma mark Application lifecycle

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    


//Create an instance of tabBarView controller
tabBarController = [[UITabBarController alloc]init];

//Create two view controllers
UIViewController *vc1 = [[RecordingViewController alloc] init];
UIViewController *vc2 = [[SavedViewController alloc] init];
self.vc2 = _vc2;


//Make an array with the two view controllers
NSArray *viewControllers = [NSArray arrayWithObjects:vc1, vc2, nil];

//Release the two view controllers since they are now retained by the array
[vc1 release];
[vc2 release];

//Attach the ViewControllers to the tabBar
[tabBarController setViewControllers:viewControllers];

//Place  the tabBar on the window
[window addSubview:[tabBarController view]];

[self.window makeKeyAndVisible];

return YES;

}

文件处理程序看起来像这样......

    Captures *capture = [[Captures alloc]initWithVideoPath:savePath];
NSLog(@"Instance of capture called:\n VideoPath: %@ \n Geo: %@, \n UserNotes: %@", [capture videoPath], [capture location], [capture userNotes]);

// Get a reference to the app delegate, and then access the vc2 property
Rolling_VideoAppDelegate *appDelegate = (Rolling_VideoAppDelegate*)[UIApplication sharedApplication].delegate;

[appDelegate.vc2 addToCapturesArray:capture];

再次感谢您的帮助。

富

Answer 1

假设你的vc1 / vc2在AppDelegate中，那么你想要的是扩展app delegate这样的东西

@interface AppDelegate
{
    // Create an ivar so that the app delegate can hold a reference
    VC2Class *_vc2;
}

// Create a property so that you can access if from the outside
@property(nonatomic, retain) VC2Class *vc2;

@end

@implementation AppDelegate

// Map the property to the ivar
@synthesize vc2 = _vc2;

// When you are freeing the app delegate make sure to nil 
// the property to release it
-(void) dealloc
{
    self.vc2 = nil;
    [super dealloc];
}

除了代码的其余部分创建vc2之外，请执行以下操作：

// Since this is a retain property it will do the retain you need 
// when assigning to self.vc2
self.vc2 = vc2;

现在在你的文件namanger中，执行以下操作：

// Get a reference to the app delegate, and then access the vc2 property
AppDelegate *appDelegate = (AppDelegate*)[UIApplication sharedApplication].delegate;
VC2Class *vc2 = appDelegate.vc2;

然后你就可以正常打电话了。请务必在文件顶部包含#import "VC2Class.h"

@end

将对象发送到UITableView控制器

1 个答案: