I've been trying to solve the same exact same problem as this question for a while, but am having trouble doing so. I've only been on XCode a few months, so help would be greatly appreciated.
In my parentVC.m I have this:
parentVC.m
- (IBAction)goToCamera:(id)sender {
[_camera takePhoto];
} return;
}
This calls the takePhoto method in an equivalent of James's PhotoManager class: an NSObject Class called Camera - where I setup the UIImagePickerController. There I state the method in the header:
Camera.h
- (void) takePhoto;
then in the implementation:
Camera.m
#class ParentVC;
#interface Camera () <UIImagePickerControllerDelgate, UINavigationControllerDelegate>
#property (nonatomic, retain) ParentVC *parentVC;
#end
#implementation Camera
-(void)takePhoto
{
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
UIImagePickerController *cameraUI = [[UIImagePickerController alloc] init];
cameraUI.sourceType = UIImagePickerControllerSourceTypeCamera;
cameraUI.delegate = self;
[_parentVC presentViewController:cameraUI animated:NO completion:nil];
}
else{
DLog(#"camera wouldn't load");
}
}
#end
and no luck. I've tried many iterations and can't figure it out. Any ideas?
Related
I am trying to update the contents of an NSTextView that is connected to myViewController as a referencing outlet to the Files Owner which is the subclass myViewController.
When I use an IBAction from a button, or use the viewDidLoad method of the controller, I can update the text fine. However, when I try run the method from another class (referred to in this example as anotherViewController), it runs the method, but the textview does not change.
myViewController.h:
#import <Cocoa/Cocoa.h>
#import "anotherViewController.h"
#interface myViewController : NSViewController { }
#property (unsafe_unretained) IBOutlet NSTextView *outText;
#property (weak) IBOutlet NSButton *updateMeButton;
- (void)updateTextView:(NSString *)argText;
- (void)updateTextViewWithoutArg;
#end
myViewController.m:
#import "myViewController.h"
#interface myViewController ()
#end
#implementation myViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.outText.string = #"I work successfully";
}
- (IBAction)updateMeButton:(id)sender {
self.outText.string = #"I am updated text! I also work!";
}
- (void)updateTextView:(NSString *)argText {
self.outText.string = #"I don't make it to the NSTextView :(";
NSLog(#"Should have updated text view");
}
- (void)updateTextViewWithoutArg {
self.outText.string = #"I don't make it to the NSTextView :(";
NSLog(#"Should have updated text view");
}
#end
In anotherViewController.m , which has all the relevant imports, I call this:
myViewController *viewtask = [[myViewController alloc] init];
[viewtask updateTextViewWithoutArg];
Nothing happens. The method runs and logs that it should have updated, but no text updates. I have tried many different approaches, including textstorage and scrollrange methods, they all work the already working sections, but make no difference in the sections not working.
I've also tried just for fun:
myViewController *viewtask;
[viewtask updateTextViewWithoutArg];
Also using the instance variable _outText
Also using [self.outText setString:#"string"];
Also using [_outText setString:#"string"];
Again, they work but only in the already working sections.
This should be simple but isn't logical to me. In swift all I need to do is
self.outText.string = "I update whenever I'm called!"
Views you create in Interface Builder are lazily created, so if you access them before viewDidLoad is called they are nil.
If your case, calling
myViewController *viewtask = [[myViewController alloc] init];
does not cause the views to be created so when you call
[viewtask updateTextViewWithoutArg];
self.outText is nil.
You can see that this is what is happening by updating your code as below:
- (void)updateTextView:(NSString *)argText {
NSAssert(self.outText != nil, #"self.outText must not be nil");
self.outText.string = #"I don't make it to the NSTextView :(";
NSLog(#"Should have updated text view");
}
you should see the assert fire.
I appear to have found a solution by making myViewController a singleton class and using sharedInstance. For this particlar app, myViewController is a debug output window and will never need to be placed in another view.
I won't accept this answer yet, as it's not the best one I'm sure. There may still be a proper solution presented that allows finding the applicable myViewController instance, and modifying the outText property attached to it. Using this singleton makes subclassing tedious as I would have to make a new class for every instance if I wanted to be able to address say 10 View Controllers.
Anyway - the way I've been able to satisfy my simple requirement:
myViewController.h:
#import <Cocoa/Cocoa.h>
#import "anotherViewController.h"
#interface myViewController : NSViewController { }
#property (unsafe_unretained) IBOutlet NSTextView *outText;
#property (weak) IBOutlet NSButton *updateMeButton;
- (void)updateTextView:(NSString *)argText;
- (void)updateTextViewWithoutArg;
+ (id)sharedInstance;
#end
myViewController.m:
#import "myViewController.h"
#interface myViewController ()
#end
#implementation myViewController
static myViewController *sharedInstance = nil;
+ (myViewController *)sharedInstance {
static myViewController *sharedInstance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedInstance = [[myViewController alloc] init];
});
return sharedInstance;
}
- (void)viewDidLoad {
[super viewDidLoad];
sharedInstance = self;
}
- (void)viewDidUnload {
sharedInstance = nil;
}
- (void)viewDidLoad {
[super viewDidLoad];
self.outText.string = #"I work successfully";
}
- (IBAction)updateMeButton:(id)sender {
sharedInstance.outText.string = #"Button Pressed";
}
- (void)updateTextView:(NSString *)argText {
sharedInstance.outText.string = argText;
}
- (void)updateTextViewWithoutArg {
sharedInstance.outText.string = #"I make it to the TextView now";
}
#end
Now when I use this code from within anotherViewController.m it updates the right instance:
[myViewController.sharedInstance updateTextView:#"Updating with this string"];
I'm quite new to Mac programming (not to Objective C).
I'm developing a small application, that shows some data and opens a second window on button press.
In the second window is a textfield and a submit button. If the submit button is pressed, the window should close + the value of the textfield needs to be passed to the first window.
I think the best method for that is a simple Delegate. I tried that but i can't change the label in the first window using the second window..
The delegate however seems to work as i can call methods from the other class and send data to it. It just won't change the label.
As this is my first try on Delegates, im pretty sure I've done something stupid here^^
or is there a better solution? Can't be to complicated to change a label from an second window.. right?
ViewController.h (FirstController)
#import <Cocoa/Cocoa.h>
#class ViewController;
#protocol ViewControllerDelegate
-(void)sayHello:(ViewController *)ViewController;
#end
#interface ViewController : NSViewController
{
IBOutlet NSTextField *txtlabel;
}
#property (nonatomic, assign) id delegate;
-(void)helloDelegate;
-(void)reciveVar:(NSString*)strvar;
#end
ViewController.m (FirstController)
#import "ViewController.h"
#implementation ViewController
#synthesize delegate;
-(id)init {
self = [super init];
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
txtlabel.stringValue=#"TEST";
}
-(void)helloDelegate
{
[delegate sayHello:self];
}
-(void)reciveVar:(NSString*)strvar
{
NSLog(#"recived: %#", strvar);
txtlabel.stringValue=strvar; // DOSENT WORK!!
}
#end
secondController.h
#import <Cocoa/Cocoa.h>
#import "ViewController.h"
#interface secondController : NSViewController <ViewControllerDelegate>
{
IBOutlet NSTextField *txtfield;
}
-(IBAction)submit:(id)sender;
#end
secondController.m
#import "firstController.h"
#implementation secondController
-(void)viewDidLoad
{
[super viewDidLoad];
ViewController *custom = [[ViewController alloc] init];
// assign delegate
custom.delegate = self;
[custom helloDelegate];
}
-(void)sayHello:(ViewController *)ViewController
{
NSLog(#"Hiya!");
}
-(IBAction)submit:(id)sender
{
NSString *txtval= txtfield.stringValue;
NSLog(#"submit: %#", txtval);
ViewController *custom = [[ViewController alloc] init];
// assign delegate
custom.delegate = self;
[custom reciveVar:txtval];
}
#end
LOG Output:
Hiya!
submit: test
recived: test
(so i guess the delegate works..)
SOLVED. (Thanks to Phillip Mills)
NSNotification is way simpler and efficient than Delegates in this case.
ViewController.m
[...]
- (void)viewDidLoad
{
[super viewDidLoad];
txtlabel.stringValue=#"TEST";
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(handleUpdatedData:)
name:#"DataUpdated"
object:nil];
}
-(void)handleUpdatedData:(NSNotification *)notification
{
NSLog(#"recieved %#", notification);
txtlabel.stringValue=[notification object];
}
secondController.m
-(IBAction)submit:(id)sender
{
NSString *txtval= txtfield.stringValue;
NSLog(#"submit: %#", txtval);
[[NSNotificationCenter defaultCenter] postNotificationName:#"DataUpdated"
object:txtval];
}
First of all, let me say that I am new to Objective C.
I'm basically trying to pass the originalPriceOnGraph variable from ViewController (UIViewController) to the original variable from GraphView (UIView). However, I keep getting 0.00 when I try and display original. I don't get what exactly is the problem. Here's some of my code:
GraphView.h
#interface GraphView : UIView
#property (nonatomic) double original;
#end
GraphView.m
#implementation GraphView
#synthesize original;
- (id)initWithFrame:(CGRect)frame
{
//some code here
}
- (void)drawRect:(CGRect)rect;
{
NSLog(#"%.2f", original);
//some more code here
}
#end
ViewController.m
#interface OtherViewController ()
#end
#implementation OtherViewController
#synthesize originalPriceOnGraph;
#synthesize graph;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
originalPriceOnGraph = 20.00;
graph = [[GraphView alloc] init];
graph.original = originalPriceOnGraph;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
ViewController.h
#interface OtherViewController : UIViewController
#property (strong, nonatomic) GraphView *graph;
#property (nonatomic) double originalPriceOnGraph;
#end
Thank you in advance!
EDIT: I was able to solve this by creating an IBOutlet between the OtherViewController and GraphView. I also got rid of the alloc init statement for GraphView in ViewController.m. Thank you all for your suggestions!
Are you sure the GraphView's drawRect: method isn't getting called before you set its 'original' property?
If so, try initializing any instance of a GraphView with a default value for original.
In GraphView.h:
-(id)initWithOriginal:(double)original;
In GraphView.m:
-(id)initWithOriginal:(double)original
{
self = [super init];
if (self) {
[self setOriginal:original];
}
return self;
}
In ViewController.m:
-(void)viewDidLoad
{
[super viewDidLoad];
originalPriceOnGraph = 20.00;
[self setGraph:[[GraphView alloc] initWithOriginal:originalPriceOnGraph]];
}
use :
self.graph = [[GraphView alloc] init];
self.graph.original = originalPriceOnGraph;
I'm having 5 ViewControllers in each of that i have to display iAd,so that i have to implement iAd code in each ViewControllers. Instead of that if i create set of common code in AppDelegate means i can just call that code wherever i need iAd to be displayed.
If anyone has implemented this iAd concept means help me to get out of this issue. Thanks in Advance.
Just create a Pointer to iAD in APP delegate.
.h:
#property (strong, nonatomic) ADBannerView *UIiAD;
.m:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
UIiAD = [[ADBannerView alloc] init];
return YES;
}
Then in your ViewControllers do this:
.h:
#property (strong, nonatomic) ADBannerView *UIiAD;
.m:
- (AppDelegate *) appdelegate {
return (AppDelegate *)[[UIApplication sharedApplication] delegate];
}
- (void) viewWillAppear:(BOOL)animated {
UIiAD = [[self appdelegate] UIiAD];
UIiAD.delegate=self;
// CODE to correct the layout
}
- (void) viewWillDisappear:(BOOL)animated{
UIiAD.delegate=nil;
UIiAD=nil;
[UIiAD removeFromSuperview];
}
Do this for all the view controllers with appropriate code to redesign the layout!
hi this looks like a good answer but don't you have to import the AppDelegate in your m files
#import "AppDelegate.h"
and shouldn't you hide the add if no network connection or add not showing
In the AppDelegate.h:
#import <iAd/iAd.h>
#interface AppDelegate : UIResponder <UIApplicationDelegate>
{
ADBannerView *_bannerView;
...
...
}
#property (nonatomic, retain) ADBannerView *_bannerView;
In the AppDelegate.m:
#synthesize _bannerView;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
...
if ([ADBannerView instancesRespondToSelector:#selector(initWithAdType:)]) {
self._bannerView = [[ADBannerView alloc] initWithAdType:ADAdTypeBanner];
} else {
self._bannerView = [[ADBannerView alloc] init];
}
...
}
In the view controllers that you need to add iAd, create a container UIView with name 'vwAd' and make the connection in xib file where you want to display iAds.
#interface ViewController : UIViewController<ADBannerViewDelegate>
{
IBOutlet UIView *vwAd;
...
...
}
- (void)layoutAnimated:(BOOL)animated
{
CGRect contentFrame = self.view.bounds;
if (contentFrame.size.width < contentFrame.size.height) {
self.appDelegate._bannerView.currentContentSizeIdentifier = ADBannerContentSizeIdentifierPortrait;
} else {
self.appDelegate._bannerView.currentContentSizeIdentifier = ADBannerContentSizeIdentifierLandscape;
}
CGRect bannerFrame = self.appDelegate._bannerView.frame;
if (self.appDelegate._bannerView.bannerLoaded) {
bannerFrame.origin.y = 0;
} else {
bannerFrame.origin.y = vwAd.frame.size.height;
}
[UIView animateWithDuration:animated ? 0.25 : 0.0 animations:^{
self.appDelegate._bannerView.frame = bannerFrame;
}];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
...
[self.appDelegate._bannerView removeFromSuperview];
self.appDelegate._bannerView.delegate = nil;
self.appDelegate._bannerView.delegate = self;
[vwAd addSubview:self.appDelegate._bannerView];
[self layoutAnimated:NO];
}
Please also review iAdSuite examples from Apple. Original layoutAnimated function can be found in iAdSuite examples. Do not forget to add the delegate functions from iAdSuite example into your view controller.
Ok, so I'm a relative noob with Objective-C/iOS programming, so hopefully someone with more knowledge here can help me out.
I have an iPad application using the SplitViewController template (with Core Data). I created another UIViewController (with xib file) called PlayerViewController. This View has several UILabel components on it.
I have a list of players that show up in the RootViewController (UITableView) and when you select a player, I programmatically create a PlayerViewController (in DetailViewController), pass it the NSManagedObject that was passed to the DetailViewController, try to set the text of one of the labels on the PlayerViewController's view, and then add it as a subview to the DetailViewController.
All of this works great except for the setting the text of the label on the PlayerViewController's view. I'm not sure what I'm doing wrong. I have used NSLog to confirm that the NSManagedObject is not nil and that the NSManagedObject property I'm trying to use has the correct text.
I'm at a loss here. Any help would be greatly appreciated. (Code follows):
This method is in the DetailViewController.m file:
- (void)configureView {
// Update the user interface for the detail item.
PlayerViewController *player = [[PlayerViewController alloc] init];
player.player = detailItem;
[self.view addSubview:player.view];
}
This method is called when the user selects an item from the RootViewController (This functionality, calling of configureView, is setup by the template and I haven't changed it).
Setting the player property of the PlayerViewController to object detailItem is handled in the setPlayer method of that class.
- (void)setPlayer:(NSManagedObject *)managedObject {
if (player != managedObject) {
[player release];
player = [managedObject retain];
// Update the view.
[self configureView];
}
}
I then have a configureView method as well in PlayerViewController that sets the text of the label:
- (void)configureView {
nickName.text = [[player valueForKey:#"Nickname"] description];
NSLog(#"Nickname %#", [[player valueForKey:#"Nickname"] description]);
NSLog(#"Nickname %#", nickName.text);
}
Ok, so the first NSLog statement prints the desired value, but the text of the UILabel (called nickName) returns nil.
The following is the full PlayerViewController.h & .m files:
PlayerViewController.h:
#import <UIKit/UIKit.h>
#import <CoreData/CoreData.h>
#interface PlayerViewController : UIViewController {
NSManagedObject *player;
IBOutlet UILabel *nickName;
IBOutlet UILabel *goalCount;
IBOutlet UILabel *assistCount;
IBOutlet UILabel *timeInGame;
}
#property (nonatomic, retain) IBOutlet UILabel *nickName;
#property (nonatomic, retain) IBOutlet UILabel *goalCount;
#property (nonatomic, retain) IBOutlet UILabel *assistCount;
#property (nonatomic, retain) IBOutlet UILabel *timeInGame;
#property (nonatomic, retain) NSManagedObject *player;
#end
PlayerViewController.m:
#import "PlayerViewController.h"
#implementation PlayerViewController
#synthesize nickName, goalCount, assistCount, timeInGame, player;
#pragma mark -
#pragma mark Managing the detail item
/*
When setting the player item, update the view
*/
- (void)setPlayer:(NSManagedObject *)managedObject {
if (player != managedObject) {
[player release];
player = [managedObject retain];
// Update the view.
[self configureView];
}
}
- (void)configureView {
nickName.text = [[player valueForKey:#"Nickname"] description];
NSLog(#"Nickname %#", [[player valueForKey:#"Nickname"] description]);
NSLog(#"Nickname %#", nickName.text);
}
/*
// The designated initializer. Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {
// Custom initialization
}
return self;
}
*/
/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
}
*/
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Overriden to allow any orientation.
return YES;
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
}
#end
I'm sure I'm just missing something trivial, but I can't figure it out, and haven't been able to find any answers searching the web.
Thanks for any help!
Ok, so after playing with this for a bit and searching and searching around, I have gotten the answer to my problem. It turns out all the code I had was fine except the location of one statement. My call to configureView in PlayerViewController.m needed to be in viewDidLoad() not in the setPlayer() method. It all works great now.
Change the configureView method to that :
- (void)configureView {
nickName.text = (NSString*)[player valueForKey:#"Nickname"];
}
Yes, better place to call method is
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self configureView];
}
(void)setPlayer:(NSManagedObject *)managedObject called before your nib files loaded.