hoepfully a simple fix. :)
I'm using a collection view with a push segue to a detailed view controller. When the cell is clicked in simulator the app crashes with a break point indicating at this part of the code:
#import "DetailViewController.h"
#interface DetailViewController ()
#property (nonatomic, weak) IBOutlet UIImageView *imageView;
#end
#implementation DetailViewController
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated]; //<--------- break point
self.imageView.image = self.image;
}
#end
segue id etc is correct. So not at all sure why it shouldn't be working.
Any help on this as always is appreciated. If you need further info let me know.
A.
edit:
.h file as follows:
#import <UIKit/UIKit.h>
#interface DetailViewController : UIViewController
#property (nonatomic, strong) UIImage *image;
#end
Related
I just like to play with coding for a hobby, so probably a noob question;
I have a simple storyboard for MacOS with 2 views. Both have there own classes (main class and subclass). How can I control a outlet in the subclass from the main class?
for example
I have a button (IBAction) in the mainclass and a textfield (IBOutlet) in the subclass. I want to set the stringvalue for the textfield with a click on the button in main.
I have searched a lot last days but just don't get it. (or just need a push in the right direction)
EDIT after JingJingTao's answer:
I used the control-drag function to open the second window.
I tried the code JingJingTao gives, but the textfield doesn't respond to the action.
My classes look like this now:
ViewController.h
#import <Cocoa/Cocoa.h>
#interface ViewController : NSViewController
- (IBAction)newText:(id)sender;
#end
ViewController.m
#import "ViewController.h"
#import "ViewController2.h"
#interface ViewController ()
#property (nonatomic) ViewController2 *subclass;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
- (void)setRepresentedObject:(id)representedObject {
[super setRepresentedObject:representedObject];
}
- (void)newText:(id)sender {
self.subclass.textField.stringValue = #"button pressed";
}
#end
ViewController2.h
#import "ViewController.h"
#interface ViewController2 : ViewController
#property (nonatomic) IBOutlet NSTextField *textField;
#end
ViewController2.m
#import "ViewController2.h"
#interface ViewController2 ()
#end
#implementation ViewController2
- (void)viewDidLoad {
[super viewDidLoad];
}
#end
Update:
I've attached two screenshots of what it looks like in the storyboard for the first suggestion,
1) Add a view to your ViewController, set the class at the top right to 'YourView', 'YourView' is a just an NSView, add a textfield to it and hook it up.
2) Add YourView as a property to your ViewController, i.e. #property (nonatomic) IBOutlet NSView *yourView; and hook it up.
Let me know if there are any issues.
You just need to put the textfield in the public interface of your subclass, so you can access it in your main class, although it does sound like you're using inheritance and I don't think you need to but that's another topic :D.
Example:
In MainClassViewController.m
#interface MainClassViewController ()
#propert (nonatomic) Subclass *subclass;
#end
#implementation MainClassViewController
// I guess you already add your subclass to the main viewcontroller because they display on the same screen.
- (void)yourButtonTapMethod {
self.subclass.textfield.text = #"Your value";
}
In Subclass.h
#interface Subclass : NSObject
#property (nonatomic) IBOutlet UITextfield *textfield;
I use Cocoa Touch instead of Cocoa, so maybe it's NSTextfield for you. Please let me know if this does not answer your question, good luck.
I am just learning and trying to put forth some of the knowledge with objective c and cocoa. I have a little program that has a login screen which then displays a main menu. On the main menu view, there is a button that should load a view to be able to add some data to the app. When I click on the button, it doesn't fire the IBAction but throws an error
EXC_BAD_ACCESS [StartMenuViewController performSelector:withObject:]: message sent to deallocated instance 0x6080195e9f90
I know that it is because there is an object that is not instantiated when the message is being sent, but I cannot find out why. Sorry for the code and the novice level here is the main menu view controller StartMenuViewController.m file:
#import "StartMenuViewController.h"
#import "AppDelegate.h"
#import "MasterViewController.h"
#interface StartMenuViewController ()
#end
#implementation StartMenuViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do view setup here.
}
-(IBAction)showStrainView:(id)sender{
AppDelegate *delegate = nil;
delegate = (AppDelegate *)[[NSApplication sharedApplication] delegate];
MasterViewController *addStrainView = [[MasterViewController alloc] initWithNibName:#"MasterViewController" bundle:nil];
[delegate swapView:self.view toView:addStrainView.view];
}
#end
here is the StartMenuViewController.h
#import <Cocoa/Cocoa.h>
#interface StartMenuViewController : NSViewController
#property (weak) IBOutlet NSButton *showStrainViewButton;
#end
Here is the AppDelegate.h
#import <Cocoa/Cocoa.h>
#class loginView, MasterViewController,StartMenuViewController;
#interface AppDelegate : NSObject <NSApplicationDelegate>{
loginView *loginView;
MasterViewController *masterViewController;
}
#property (assign) IBOutlet NSWindow *window;
#property (readonly, strong, nonatomic) NSManagedObjectContext *managedObjectContext;
#property (readonly, strong, nonatomic) NSManagedObjectModel *managedObjectModel;
#property (readonly, strong, nonatomic) NSPersistentStoreCoordinator *persistentStoreCoordinator;
#property (strong) loginView *loginView;
#property (strong) MasterViewController *masterViewController;
#property (strong) StartMenuViewController *starMenuViewController;
-(void)swapView:(NSView *)view1 toView:(NSView *)view2;
#end
Here is the AppDelegate.m
#import "AppDelegate.h"
#include "MasterViewController.h"
#import "ScaryBugDoc.h"
#import "Strains.h"
#import "loginView.h"
#interface AppDelegate()
#end
#implementation AppDelegate
#synthesize managedObjectContext = _managedObjectContext;
#synthesize managedObjectModel = _managedObjectModel;
#synthesize persistentStoreCoordinator = _persistentStoreCoordinator;
#synthesize loginView;
#synthesize masterViewController;
#synthesize starMenuViewController;
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
// 1. Create the master View Controller
self.loginView = [[loginView alloc] initWithNibName:#"loginView" bundle:nil];
// 2. Add the view controller to the Window's content view
[self.window.contentView addSubview:self.loginView.view];
self.loginView.view.frame = ((NSView*)self.window.contentView).bounds;
}
-(void)swapView:(NSView *)view1 toView:(NSView *)view2{
//[view1 removeFromSuperview];
[self.window.contentView addSubview:view2];
view2.frame = ((NSView*)self.window.contentView).bounds;
}
#end
If you need the loginView.h and loginView.m files I can add them as well. I would appreciate any and all help. Thanks in advance
The problem is here:
MasterViewController *addStrainView = [[MasterViewController alloc]initWithNibName:#"MasterViewController" bundle:nil];
[delegate swapView:self.view toView:addStrainView.view];
You don't keep a reference to the MasterViewController so it gets deallocated even though its view is kept around. Now anytime the view tries to access methods from the view controller, things fail.
You should make addStrainView a child view controller of self in the above code so the view controller sticks around as long as its view.
Let me first say that I have looked at ALL the stack overflow questions regarding this and none have helped So I thought I'd Start my own.
The Problem: I can't dismiss this popover when selected just like lots of other questions.
The difference: All of their ways haven't worked.
So, Lets look at the code:
In my table view controller.h:
#import <UIKit/UIKit.h>
#protocol PopoverDelegate <NSObject>
-(void)didRowAtIndexPathIsSelected;
#end
#interface tableViewController : UITableViewController
#property (strong, nonatomic) id<PopoverDelegate> myPODelegate;
In my table view controller.m:
#import "tableViewController.h"
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[_myPODelegate didRowAtIndexPathIsSelected];
NSLog(#"IS it Gone?");
}
Then in my Main View Controller.h
#import <UIKit/UIKit.h>
#import "tableViewController.h"
#interface MainView : UICollectionViewController <PopoverDelegate>
#property (nonatomic, strong) TableViewController *tvController;
#property (nonatomic, strong) UIPopoverController *tvPopover;
And the Main View Controller.m:
-(void)didRowAtIndexPathIsSelected
{
NSLog(#"Dismissing now");
[tvPopover dismissPopoverAnimated:YES];
tvPopover = nil;
}
All help is appreciated.
edit:
I've been trying lots of different debuging ideas and tried:
NSLog(#"%#", _myPODelegate);
Inside the didSelectRowAtIndexPath and it came back (null).
you have to set your delegate in MainView class where you are allocating the object of tvController such that:
tvController. myPODelegate = self
I am trying to improve myself in Objective-C and what I am on about is now modifying and changing and existed project. I did everything I wanted expect one thing. Theres an info button in my program and it doesnt related with .xib file. I tried to remove it but always my main.m gave error like SIGABRT (int retval thing.)
Here is the thing what I want to modify
http://i.stack.imgur.com/ZG51s.png // The picture of my program and info button
I am trying to remove the (i) button on the right-down corner.
Here's my code
This is my RootViewController.h
#import <UIKit/UIKit.h>
#class MainViewController;
#interface RootViewController : UIViewController {
IBOutlet UIButton *infoButton; //Silinecek
MainViewController *mainViewController;
}
#property (nonatomic, retain) MainViewController *mainViewController;
#end
This is my RootViewController.m
#import "RootViewController.h"
#import "MainViewController.h"
#implementation RootViewController
#synthesize mainViewController;
- (void)viewDidLoad {
MainViewController *viewController = [[MainViewController alloc] initWithNibName:#"MainView" bundle:nil];
self.mainViewController = viewController;
[viewController release];
[self.view insertSubview:mainViewController.view belowSubview:infoButton];
}
and also I tried to modify my AppDelegate h and m. Here they are ;
#import <UIKit/UIKit.h>
#class RootViewController;
#interface AppDelegate : NSObject <UIApplicationDelegate> {
IBOutlet UIWindow *window;
IBOutlet RootViewController *rootViewController;
}
#property (nonatomic, retain) UIWindow *window;
#property (nonatomic, retain) RootViewController *rootViewController;
#end
#import "AppDelegate.h"
#import "RootViewController.h"
#implementation AppDelegate
#synthesize window;
#synthesize rootViewController;
- (void)applicationDidFinishLaunching:(UIApplication *)application {
[window addSubview:[rootViewController view]];
//[window makeKeyAndVisible];
}
/*
- (void)dealloc {
[rootViewController release];
[window release];
[super dealloc];
}
*/
What should I do for removing that info button in my View. Thanks for the any tips
And if you are interested in this is the whole algorithm : http://pastebin.com/hHQkQYS6
Do you still have the control linked somewhere in your xib file? It is declared as an IBOutlet control. Usually when I have these controls I will use the GUI link this control in some way (I can't remember what exactly as I have not done Obj-C in a long time). But I would definitely have a look around you xib file (as well as removing [self.view insertSubview:mainViewController.view belowSubview:infoButton];
The exception mentions:
[<RootViewController 0x4b9ab20> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key infoButton.
The call stack shows that it is thrown by UINib. So this is happening during nib load. So check for all objects present, carefully, in the nib and remove the info button
I have the following code:
//RootViewController.h:
#import <UIKit/UIKit.h>
#interface RootViewController : UIViewController{
IBOutlet UITextField *login_uname;
IBOutlet UITextField *login_pword;
IBOutlet UIActivityIndicatorView *login_thinger;
IBOutlet UIImageView *logo;
IBOutlet UISwitch *login_remember;
IBOutlet UIScrollView *scrollView;
}
-(IBAction) login_submitClick:(id)sender;
-(IBAction) doneEditing:(id)sender;
-(IBAction) clearPword:(id)sender;
-(void) showSignUp:(id)sender;
-(void)doLogout:(id)sender;
//for file handling:
-(NSString *)documentsPath;
-(NSString *)readFromFile:(NSString *)filePath;
-(void) writeToFile:(NSString *)text withFileName:(NSString *) filePath;
#end
//RootViewController.m
#import "RootViewController.h"
//#import "Main.h"
//#import "SignUp.h"
#import "ASIHTTPRequest.h"
#import "ASIFormDataRequest.h"
#import "CommonCrypto/CommonHMAC.h"
#import "Details.h"
//#import "signUpSMS.h"
#import "JSON.h"
#implementation PrestoCab3ViewController
#synthesize login_uname; //this line throws the error in the title
...
I'm using XCode 4.1 and was wondering if someone could please help me get to the bottom of this error. I'm very new to XCode.
Many thanks in advance,
You need to declare the property with #property in your interface.
#property( nonatomic, retain ) IBOutlet UITextField * login_uname;
Here, non-atomic is used because it's an IBOutlet.
Also note the property has the retain modifier, meaning you are responsible to release the object when you don't need it anymore.