I'm learning about iPad development from the book Head First iPhone & iPad Development (2nd Edition). I'm stuck in chapter 7, page 347. This is the chapter on taking the DrinkMixer iPhone app and turning it into a universal app for both the iPhone and the iPad.
We added a split view controller (UISplitViewController) and the coding behind it all goes well (no build errors). The one difference I'm doing is that I'm using storyboards. Up to this point it's been going well, but now the book says to add a split view property IBOutlet (code below) for the detail view controller (*splitViewDetailView) and hook that #property up to the detail view.
MasterViewController.h
#import <UIKit/UIKit.h>
#class DetailViewController;
#interface MasterViewController : UITableViewController {
NSMutableArray *drinks;
DetailViewController *splitViewDetailView;
}
#property (nonatomic, retain) NSMutableArray *drinks;
#property (nonatomic, retain) IBOutlet DetailViewController *splitViewDetailView;
#end
MasterViewController.m (top part)
#import "MasterViewController.h"
#import "DetailViewController.h"
#import "AddDrinkViewController.h"
#import "DrinkConstants.h"
#implementation MasterViewController
#synthesize drinks;
#synthesize splitViewDetailView;
The problem I'm having is that when I try to hook up the property to the detail view, it won't let me. The connection wire won't snap into the view. I've done many other IBOutlets and IBActions so far and it was easy to do. Anyone know what I'm doing wrong?
I've tried to search for a similar issues here on stack overflow and the web for the past 2 days and so far I've come up empty.
I found out that I was going about this the wrong way. The solution was simpler than I thought.
Link
Thank you Marcus Buffett. I'd vote you up but I don't have enough reputation points yet.
Related
I am including a file like this:
#import "BannerPhoneContentController.h"
however, when I try to use it like this:
bannerContentController = [[BannerPhoneContentController alloc] init];
I get the error:
Use of undeclared identifier 'BannerPhoneContentController';
what could be causing the code to seemingly ignore my import?
this is the header for banner content controller.
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import "BannerContentController.h"
#interface BannerPhoneContentController : BannerContentController <UIScrollViewDelegate>
{
UIScrollView *scrollView;
UIPageControl *pageControl;
NSMutableArray *viewControllers;
// To be used when scrolls originate from the UIPageControl
BOOL pageControlUsed;
}
#property (nonatomic, retain) UIScrollView *scrollView;
#property (nonatomic, retain) UIPageControl *pageControl;
#property (nonatomic, retain) NSMutableArray *viewControllers;
- (IBAction)changePage:(id)sender;
#end
EDIT bannerContentController is of type BannerContentController NOT BannerPhoneContentController. The latter is a subtype of the former. It is definitely worth noting that this exact code works just fine in another app, so it's nothing to do with the code itself - just how it's being included apparently. I'm stumped.
EDIT ok found the problem - not sure how to fix it. I generated the preprocessed file and the header file it's included is in fact this:
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import "ContentController.h"
#interface PhoneContentController : ContentController <UIScrollViewDelegate>
{
UIScrollView *scrollView;
UIPageControl *pageControl;
NSMutableArray *viewControllers;
// To be used when scrolls originate from the UIPageControl
BOOL pageControlUsed;
}
#property (nonatomic, retain) UIScrollView *scrollView;
#property (nonatomic, retain) UIPageControl *pageControl;
#property (nonatomic, retain) NSMutableArray *viewControllers;
- (IBAction)changePage:(id)sender;
#end
note the difference - all the 'Banner's are missing. This is what the file used to look like. However, I've checked and the file that's in the project is the one I posted at the top. I tried cleaning the solution and building again. How can I fix this and why has it happened?
EDIT The file that I'm including all this in is part of a code library. I have now created a new project, imported the code library and included all of this in that library once again in exactly the same way. and it works. I have looked over the two projects and the code in question is identical. This must be a project setting?
It looks for me like recursive import. Say, BannerContentController.h imports BannerPhoneContentController.h, and BannerPhoneContentController.h imports BannerContentController.h.
If it is the case, then you should resolve recursive dependencies. E.g. using forward declaration.
does using #class BannerPhoneContentController in .h and #import "BannerPhoneContentController.h" in .m gives the same result ?
After a lot of messing around, and thanks to a comment from Yuras I generated the preprocessed code and realised the problem was that the OLD version of the code was being included.
More useful is WHY. It's just a bug in XCode that happens sometimes when incremental linking is turned on - basically this is where time is saved by only changing the parts of the pre-processed file when the corresponding bits of your code have been altered. Unfortunately, this does not alway work correctly.
The solution, annoyingly, was to delete the files, clean the build, delete the derived data (window / oraniser / projects / project name / delete derived data), restart xcode (possibly also restart your computer, or throw it out of the window and buy a new one) then re-import the files.
XCode can be a real pain...
I have read other questions here, but they seem to be for Xcode 3.2 or earlier, but nothing for 4.2. :(
I started a simple project and was wanting to connect the File Owner's Outlets within my xib. The bummer is that my IBOutlet's from my ViewController.h aren't coming over.
I don't have a reputation of 10 or above, so here is a screenshot of my File's Owner not showing my IBOutlets.
Here is my ViewController.h code:
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController {
IBOutlet UITextField *txtName;
IBOutlet UILabel *lblMessage;
}
#property (nonatomic, retain) IBOutlet UITextField *txtName;
#property (nonatomic, retain) IBOutlet UILabel *lblMessage;
- (IBAction)doSomething;
#end
Here is my ViewController.m code:
#import "ViewController.h"
#implementation ViewController
#synthesize txtName;
#synthesize lblMessage;
- (IBAction) doSomething
{
NSString *msg = [[NSString alloc] initWithFormat:#"Hello, %#",txtName.text];
[lblMessage setText:msg];
}
#end
I am new to Objective-C and Xcode, so I could have made a mistake, but I've followed many tutorials and I can never get my IBOutlets to show. I have gone as far as to delete Xcode 4.2 and re-installed to try and fix this issue. Here is a screenshot of my Xcode Version 4.2, Build 4D199 info.
Anyone else run into this issue? Thanks anyone who can point out any mistakes I have made. Please let me know if more information is needed.
When you create your IBAction, in the .h file, there will be a connection indicator to the left of it. When it isn't connected it shows a empty circle.
Press and hold this and drag it to the item you want to connect it to. I usually open up the XIB in a new window by double clicking it.
If it wont connect you must set the File's Owner in the XIB file. Select File's Owner in the Placeholders panel. Move over to the Utilities panel and make sure the Custom class, in Identity Inspector, is set to what ever your viewcontroller is named.
I Hope this will help you.
Cheers!
Try to reassign your file owner class reference in xib file.
Then attach all your IBOutlet connections.
Hope this might be helpful to you.
Check if the Files Owner is set to "ViewController". Check the following link:
http://developer.apple.com/library/ios/#documentation/IDEs/Conceptual/Xcode4TransitionGuide/InterfaceBuilder/InterfaceBuilder.html
Two things need to be added, before Xcode will allow creation of IBOutlet for the text field from the Storyboard:
Assign the underlying ViewController as the delegate to the UITextField
Add the to the #interface declaration in the ViewController.h file:
#interface ViewController : UIViewController<UITextFieldDelegate>
Until both of these are completed, you can Ctrl-click and drag from the Storyboard to the .h file, but no IBOutlet connection will be enabled.
I've finally figured out the issue, hope this helps anyone else currently having the same problem.
It had nothing to do with the xib's file owner setting. What my issue was that I had the xib file in a different directory than the source files, thus it wasn't able to connect the outlets. Once I moved the files to the same directory, everything worked. FYI, I moved everything to the top directory. Not sure sub directories will work...
To move the files, be sure to update xcode to point to the new locations.
I'm a newbie in iphone app developing, I just started learning two weeks ago due to the need of my final project.
So please forgive me if my question seems really stupid.
I've searched in forums and zbar documentation about how to customize the cameraView.
But I still didn't have a clear understanding about how to do it.
Now I'm trying to add tabbar into the cameraView, could anybody tell me how to do it?
I know that I need to use overlay and create my own view, adding the reader as a subview in it. Could anybody give me some direction more explicitly about how to reaise it?
Thanks in advance!!
You have to create your own custom UITabBarController class. And add this controller in your custom camera view. and custom camera view is created by the AVFoundation framework.
From what I know, you need to add the tabbar to the appDelegate and then inner views within each tab. Therefore you would have within the appdelegate applicationDidFinishLoading method
// Add the tab bar controller's view to the window and display.
[window addSubview:tabBarController.view];
[window makeKeyAndVisible];
of course, you need to declare it in the appdelegate.h file
#interface AppDelegate : NSObject <UIApplicationDelegate, UITabBarControllerDelegate> {
UIWindow *window;
UITabBarController *tabBarController;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet UITabBarController *tabBarController;
Search for tabBar tutorials. They must be created BEFORE any NAVIGATION Controller.
Then place all your zbar code in the first view controller.
I am trying to figure out how to take a screen capture feed and send it to an iOS device (an iPad in this case) and have the images displayed on the screen, updating as each new image is sent while clearing the old one from memory.
I am just starting with the basics, so I am trying to get the simulator to load a screenshot from the desktop and display it on the screen, and then change the image as I take a new screenshot, and either delete the old one so I can rename the new screenshot to carry the same name or to simply overwrite the old one (thus the reference should still point correctly in the programming code).
I tried using a button that reloaded my UIImageView via:
- (IBAction)buttonPressed:(id)sender
{
[UIImageView setImage:ScreenCapture];
}
where ScreenCapture is the name of the UIImageView, with the hope that it would reload the existing referenced image.png file, but clicking the button simply exits that program within the simulator and goes back to the simulator's home screen.
Am I using the wrong object when trying to get this done via UIImageView? Is their an existing program/tutorial on this?
I would try to reverse engineer VNC for the iPhone, but both the copyright issues and the amount of advanced programming features are well beyond me.
Once I can get something working through Xcode, I am also planning on trying to implement the same thing via MonoTouch to see which language is easier to use and more beginner friendly.
Thank you for the help,
~Chris
header:
#import <UIKit/UIKit.h>
#interface Screen_Capture_3ViewController : UIViewController {
IBOutlet UIImageView *ScreenCapture;
IBOutlet UIBarButtonItem *Update;
}
#property (nonatomic, retain) IBOutlet UIImageView *ScreenCapture;
#property (nonatomic, retain) IBOutlet UIBarButtonItem *Update;
- (IBAction)buttonPressed:(id)sender;
#end
.m:
#import "Screen_Capture_3ViewController.h"
#implementation Screen_Capture_3ViewController
#synthesize ScreenCapture;
#synthesize Update;
- (IBAction)buttonPressed:(id)sender
{
[UIImageView setImage:ScreenCapture];
}
Everything else remains at the default when selecting "View-based Application", and I connected the ScreenCapture to the UIImageView in Interface builder, as well as Update and buttonPressed to the UIBarButtonItem in Interface Builder.
setImage is an instance method, not a class method, so you can't send it directly to UIImageView (nor would it really mean much).
Keep your current code from your question for the header (but only the property should be marked as IBOutlet):
#interface Screen_Capture_3ViewController : UIViewController {
UIImageView *ScreenCapture;
UIBarButtonItem *Update;
}
#property (nonatomic, retain) IBOutlet UIImageView *ScreenCapture;
#property (nonatomic, retain) IBOutlet UIBarButtonItem *Update;
- (IBAction)buttonPressed:(id)sender;
#end
In your implementation, your event handler should be something like this:
- (IBAction)buttonPressed:(id)sender {
UIImage* newImage = [UIImage imageWithContentsOfFile:#"pathToImage.png"];
[ScreenCapture setImage:newImage];
}
The context: I have three views. One Introductory view, an Upload view and the Main view. As classes (With their respective headers) I have the rootViewController (SwitchViewController), IntroViewController and UploadViewController. The first view to be shown is IntroView. The user presses a button (declared in SwitchViewController) that takes them to the UploadView, then in the UploadView they get to choose an image and press the button again to go back to IntroView.
The thing is that while the user gets to pick the image with UIImagePickerController the button to switch views won't hide nor a UIImageView I have with a logo on top of the view(screen). The UIImageView and the UIButton are both declared in SwitchViewController's header.
The code used:
UploadViewController.h
#import [...] //Imports
#class SwitchViewController;
#interface UploadViewController :
UIViewController <UIImagePickerControllerDelegate,
UINavigationControllerDelegate,UIActionSheetDelegate> {
UITextField *imageTextField;
UIImageView *uploadedImage;
SwitchViewController *switchViewController;
[...]
}
#property (nonatomic, retain) SwitchViewController *switchViewController;
#property (nonatomic, retain) IBOutlet UITextField *imageTextField;
#property (nonatomic, retain) IBOutlet UIImageView *uploadedImage;
[...]
#end
UploadViewController.m
[...]
- (IBAction) selectImageButtonPressed {
self.switchViewController.submitButton.hidden = YES;
self.switchViewController.imageLogo.hidden = YES;
[...] //continues
I just begun recently programming in objective-c so please forgive me if the question is very essential. I have looked and am following "Beginning iPhone 3 Development" of APRESS. But even if it helps to greatly understand the basics sometimes I get lost.
PS: If it is clearer to answer the question the SwitchViewController.h and .m snippet codes can be provided if asked. But I thought this text is big as it is.
#Joze i think I may have understood your problem switchViewController is a variable of the class UploadViewController so if you do anything with that variable it wont affect the switchViewController view. so when you are calling the switchViewController view at that time you have to do initWithNibName: bundle: and then hide the button and imageView and also you need to do something like switchViewController.delegate = self; and then call the view modally or what ever way you want it.
PS. i m not sure the that spelling is correct. i dont have xcode at my home.
I hope your problem solves with this.
I solved my problem after refactoring the whole code and changing the general structure of the program itself. Now I have 3 views and each with a viewController to control it. All the switching of views occurs in the Delegate since he has access to everyone. That way I can control every property with every controller, without much difficulty. Changing the property of one of the objects present in one view from another view is difficult and rather inconvenient if not sometimes impossible.
The approach I took when asking this question was short sighted for the application that had to be done. I thank all those who tried to help.