当我单击IOS中的按钮时，为什么视图不显示？

Question

I am new to IOS , and I want to implement the album by collectionView in IOS.

When I click the filebrowserbutton button in first View , it will change to the second View (name: AITCameraCollectionBrowser ).

There has two button and a collectionView in AITCameraCollectionBrowser like the following picture.

And the code of it's header file is like the following code.

#import <UIKit/UIKit.h>

@interface AITCameraCollectionBrowser : UIViewController <UICollectionViewDelegate, UICollectionViewDataSource>
@property (strong, nonatomic) IBOutlet UIButton *backButton;
@property (strong, nonatomic) IBOutlet UIButton *localAlbumButton;
@property (strong, nonatomic) IBOutlet UICollectionView *collectionview;

@end

I have not load the picture from phone yet , so it should show the view like the above picture when I click the change view button in first view .

The code of filebrowserbutton button is like the following.

- (IBAction)filebrowserbutton:(id)sender {

    UIViewController *viewController = nil ;

    viewController = [[AITCameraCollectionBrowser alloc] initWithNibName:@"AITCameraCollectionBrowser" bundle:nil] ;

    viewController.edgesForExtendedLayout = UIRectEdgeNone;

    self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"Back", nil) style: UIBarButtonItemStyleBordered target:nil action:nil] ;
    [self.navigationController pushViewController:viewController animated:YES];
}

The above code of button in first view is no problem.

But it doesn't show anything when I click the filebrowserbutton button , it only has a backBarButtonItem on the top of screen.

So the problem is at second view , and I don't know why the button and collectionView is not show ?

Answer 1

In you're header, or .h file, add the following code

- (IBAction)filebrowserbutton:(id)sender;

next, in you're xib or storyboard file, you have to connect filebrowserbutton from you're file's owner (by right-clicking the yellow, transparent box on the left of you're first picture) to the button, and choose touch up inside .

Answer 2

You need to add - (IBAction)filebrowserbutton:(id)sender; to your header file and connect it to your button's touchDown method.