What needs to be hooked up for an NSDocument subclass to call its print methods when File->Print... is chosen?
How does the File->Print menu get hooked up? (Right now the selector/action is hooked up to first responder's print method. That's in a storyboard, while my NSDocument subclass has its own xib.)
I've tried implementing all of:
-(void)print:(id)sender;
-(void)printDocument:(id)sender;
-(void)printDocumentWithSettings:(NSDictionary *)printSettings showPrintPanel:(BOOL)showPrintPanel delegate:(id)delegate didPrintSelector:(SEL)didPrintSelector contextInfo:(void *)contextInfo;
-(NSPrintOperation*)printOperationWithSettings:(NSDictionary *)printSettings error:(NSError *__autoreleasing *)outError;
But none of them are ever called when I choose Print. Where are these methods supposed to go/who calls them? (I also tried a basic app with a custom view and didn't have luck there either.)
Okay. Looks like the problem is due to a bug in Xcode: When creating a Document based app using storyboards the file menu is by default hooked to print: and printDocument: is not available.
The strange part is that my print: call is getting hijacked somewhere along the line but I can't figure out where (at the application level, not the document, because the print dialog is a window not a sheet). printDocument: works as expected, but must be defined manually in order to hook it up.
This is for a document-based app, targeting 10.10, and using storyboards.
In the storyboard with Main Menu, add a User Defined Action for printDocument: (This is where storyboard based differs, and I feel is a bug. Xib based do not require this User Defined Action.)
Hook up the selector for File -> Print to First Responder and choose printDocument: instead of print:
Don't define printDocument: in your NSDocument subclass. If you want to, then be sure to call super or perhaps one of the methods below.
From NSDocument.h
/* The action of the File menu's Print... item in a document-based application.
The default implementation of this method merely invokes
[self printDocumentWithSettings:[NSDictionary dictionary]
showPrintPanel:YES
delegate:nil
didPrintSelector:NULL
contextInfo:NULL].
*/
- (IBAction)printDocument:(id)sender;
The default implementation of printDocumentWithSettings in turn calls printOperationWithSettings, so you can use either of those methods to draw custom information prior to the print sheet appearing.
The accepted solution of setting the menu item to -printDocument: is correct, but not (technically) because of an Xcode bug. (It is very a poor default setting, though.)
The menu item is calling the -print: of the whatever is the first-responder. NSView implements -print:, so if anything has been set as first-responder you will print with NSView's -print:, not your document's -print:. If editing your document requires text editing, the control you are using to implement editing will be set to first-responder, and that control will get the -print:.
Take a look at the TextEdit sample code from Apple (https://developer.apple.com/library/mac/samplecode/TextEdit/Introduction/Intro.html)
In my non-document based app I have set a custom action for the print menu item. In that method I notified my controller about the print operation via NSNotificationCenter. Maybe that works for you too :)
I am noob to XCode and Obj-C world, so pardon me for my naive question.
Following a tutorial, I was writing a basic program in Cocos2D that would accept touch input.
And one of the task was to add implement ccTouchBegan method, but that would not show up in XCode's code sense.
I wanted to implement this method
-(BOOL) ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event
but I would find only this one (related to touch began)
-(BOOL) ccTouchesBeganWithEvent:(*)event
Now that I a noob, how do I explore list of all available methods and properties for a particular Class?
The image shows list of available methods that starts with ccT. ccTouchBegan and ccTouchEnded showed up because I have implemented them already. Else, they would not show just like ccTouchCancelled and ccTouchMoved events didn't show up.
How do I see all available methods & properties of a Class or Object?
To see all the available methods & properties just press Ctrl+Space
Option+Click on the object (in this case, that would be the delegate name in the header file between the < >). A small help popup will appear. Click the blue text inside the popup and the Organizer window will open at the documentation for the Class. The Documentation has all methods and properties you can use.
Just press Backspace 3 times to delete the ccT you typed in. The list will increase with every character you erase. The full list not only shows methods, as you will see.
Maybe it does not show up because you have already defined it in your code? That would be logical, as double implementation would lead to a compiler error.
I am using UIViewController (a subclass of course) with a text field which sends an action when the contents changed (to the contentsChanged: selector of the ViewController). It is done by sending contentsChanged: to file's owner in IB.
But when I test it, it says : "-[NSCFString contentsChanged:] : unrecognised selector sent to instance " and the instance pointer in hex.
I am guessing that for some reason the view controller gets moved to another pointer and a string gets allocated there, but I cannot figure why.
Any ideas ?
Sounds like a classic case. Read up on NSZombieEnabled for how to track this sort of problem down.
I have the exact same problem with a subclass of UIViewController and this piece of innocuous code:
- (void)viewDidLoad
{
NSLog(#"%# %s %#", [self class], _cmd, answerButton);
[self.answerButton addTarget:self
action:#selector(getAnswerToQuestion:)
forControlEvents:UIControlEventTouchUpInside];
}
Yes, answerButton is connected (it's an IBOutlet), yes, - (IBAction)getAnswerToQuestion:(id)sender; is a proper method, but no joy. When I commented out the viewDidLoad and made the connection in IB, it showed in the crash report that the failure happens on [UIControl sendAction:to:forEvent:] resulting in
objc_msgSend() selector name: performSelector:withObject:withObject:
I can't prove it, but I suspect there's a bug somewhere in the UIKit that translates the bindings and addTarget to a call to performSelector. I'm planning to upgrade to iOS 4.01 first to see if that won't solve the problem.
UPDATE:
I'm not sure anymore that my problem really is similar to Alexandre Cassagne's but in the interest of sharing information I will not delete it just yet. I solved my problem, as so often, when I started to make an example project in order to file a bug report. Yes, clicking made answerButton call getAnswerToQuestion: like a good little object and all was fine.
The difference between the subclassed UIViewController of the example project and that of my real project was that the first also functioned as the xib's File's Owner while the second was just one of several view controller. When I moved getAnswerToQuestion: to the File's Owner in my real project, clicking answerButton worked as expected. So, my hunch that the problem lay somewhere in the translation from binding to performSelector wasn't that far off: the problem lies in the Responder Chain. I would think that establishing the Action-Target link either programmatically or in IB would bypass the Responder Chain, but apparently not.
The problem now, of course, is that Alexandre states in his question that his contentsChanged: method already is part of the File's Owner, which makes my answer irrelevant to the question.
without looking at the code, it looks like you are calling contentsChanged: on the text field's text, instead of the UIViewController subclass.
you should consider using the UITextFieldDelegate protocol to get called back when the text of a UITextField changes. I have not looked, but this is the thing I would do off the top of my head.
I created a button and added an action for it, but as soon as it invoked, I got this error:
-[NSCFDictionary numberButtonClick:]: unrecognized selector sent to instance
0x3d03ac0 2010-03-16 22:23:58.811
Money[8056:207] *** Terminating app
due to uncaught exception
'NSInvalidArgumentException', reason:'*** -[NSCFDictionary numberButtonClick:]: unrecognized selector sent to instance 0x3d03ac0'
This is my code:
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
UIButton *numberButton = [UIButton buttonWithType:UIButtonTypeCustom];
numberButton.frame = CGRectMake(10, 435, 46, 38);
[numberButton setImage:[UIImage imageNamed:#"one.png"] forState:UIControlStateNormal];
[numberButton addTarget:self action:#selector(numberButtonClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview: numberButton];
}
return self;
}
-(IBAction)numberButtonClick:(id)sender{
NSLog(#"---");
}
It looks like you're not memory managing the view controller properly and it is being deallocated at some point - which causes the numberButtonClicked: method to be sent to another object that is now occupying the memory that the view controller was previously occupying...
Make sure you're properly retaining/releasing your view controller.
For those getting here via Google like I did, which probably pertains more to Xcode 4.2+/iOS 5+ more, what with ARC. I had the same error "unrecognized selector sent to instance". In my case I had a UIButton's target action set up to pass itself as the sender parameter, but later realised I didn't need it and removed that in code. So, something like:
- (IBAction)buttonPressed:(UIButton *)sender {
Was changed to:
- (IBAction)buttonPressed {
Right clicking the UIButton in question showed that the Touch Up Inside event was associated with the view controllers buttonPressed: method. Removing this and reassigning it to the modified method worked a treat.
This was the top Google answer for this issue, but I had a different cause/result - I thought I'd add in my two cents in case others stumble across this problem.
I had a similar issue just this morning. I found that if you right click the UI item giving you the issue, you can see what connections have been created. In my case I had a button wired up to two actions. I deleted the actions from the right-click menu and rewired them up and my problem was fixed.
So make sure you actions are wired up right.
OK, I have to chip in here. The OP dynamically created the button. I had a similar issue and the answer (after hours of hunting) is so simple it made me sick.
When using:
action:#selector(xxxButtonClick:)
or (as in my case)
action:NSSelectorFromString([[NSString alloc] initWithFormat:#"%#BtnTui:", name.lowercaseString])
If you place a colon at the end of the string - it will pass the sender. If you do not place the colon at the end of the string it will not, and the receiver will get an error if it expects one. It is easy to miss the colon if you are dynamically creating the event name.
The receiver code options look like this:
- (void)doneBtnTui:(id)sender {
NSLog(#"Done Button - with sender");
}
or
- (void)doneBtnTui {
NSLog(#"Done Button - no sender");
}
As usual, it is always the obvious answer that gets missed.
In my case the function was not expecting an argument but the button was configured to send one causing the error. To fix this I had to rewire the event handler.
Here is my function:
Notice it contains no arguments.
Here is an image of my button configuration (right click on the button to view it):
Notice there are 3 event handlers.
To fix this I had to remove each of the event items since one of them was sending a reference to itself to the enterPressed function. To remove these items I clicked on the little x icon next to the name of each item until there were no items shown.
Next I had to reconnect the button to the event. To do this hold down the Control key and then drag a line from the button to the action. It should say "Connect Action". Note: I had to restart XCode for this to work for some reason; otherwise it only let me insert actions (aka create a new action) above or below the function.
You should now have a single event handler wired to the button event that passes no arguments:
This answer compliments the answer by #Leonard Challis which you should read as well.
This can also happen if you don't set the "Class" of the view in interface builder.
In my case, I was using NSNotificationCenter and was attempting to use a selector that took no arguments, but was adding a colon. Removing the colon fixed the problem.
When using a selector name, don't use a trailing colon if there are no arguments. If there's one argument, use one trailing colon. If there are more than one argument, you must name them along with a trailing colon for each argument.
See Adam Rosenfield's answer here: Selectors in Objective-C?
I had this problem with a Swift project where I'm creating the buttons dynamically. Problem code:
var trashBarButtonItem: UIBarButtonItem {
return UIBarButtonItem(barButtonSystemItem: .Add, target: self, action: "newButtonClicked")
}
func newButtonClicked(barButtonItem: UIBarButtonItem) {
NSLog("A bar button item on the default toolbar was clicked: \(barButtonItem).")
}
The solution was to add a full colon ':' after the action: e.g.
var trashBarButtonItem: UIBarButtonItem {
return UIBarButtonItem(barButtonSystemItem: .Add, target: self, action: "newButtonClicked:")
}
func newButtonClicked(barButtonItem: UIBarButtonItem) {
NSLog("A bar button item on the default toolbar was clicked: \(barButtonItem).")
}
Full example here: https://developer.apple.com/library/content/samplecode/UICatalog/Listings/Swift_UIKitCatalog_DefaultToolbarViewController_swift.html
The most obvious cause of this (included for completeness) is improperly casting a pointer and calling a method of the wrong class.
NSArray* array = [[NSArray alloc] init];
[(NSDictionary*)array objectForKey: key]; // array is not a dictionary, hence exception
I also had the same issue.
I deleted my uibutton in my storyboard and recreated it .. now everything works fine.
How to debug ‘unrecognized selector send to instance’
In most of the cases Xcode do not take us to the exact line where this issue happen. When app crash you won’t see the line of code that caused this, rather you will be taken to App delegate class, in which the error output may look like:
[UITableViewCellContentView image]: unrecognized selector sent to instance
or
[__NSDictionaryI objectAtIndex:] unrecognized selector sent to instance
or
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[TestApp.MyViewController viewDidLoad:]: unrecognized selector sent to instance 0xDABCDD'
How to find line of code causing this:
Go to breakpoint navigator. Click ‘+’ option. click ‘Exception Breakpoint’. An new widget like following will apear.
Add following condition block:
-[NSObject(NSObject) doesNotRecognizeSelector:]
You can also put breakpoint for all exception.
Now run your code again. this time, breakpoint will trigger when this exception occurs.
WRITTEN BY: Prafulla Singh
Full explanition: https://prafullkumar77.medium.com/how-to-debug-unrecognized-selector-send-to-instance-402473bc23d
I had a similar problem, but for me the solution was slightly different. In my case, I used a Category to extend an existing class (UIImage for some resizing capabilities - see this howto in case you're interested) and forgot to add the *.m file to the build target. Stupid error, but not always obvious when it happens where to look. I thought it's worth sharing...
Another possible solution: Add '-ObjC' to your linker arguments.
Full explanation is here: Objective-C categories in static library
I think the gist is: if the category is defined in a library you are statically linking with, the linker isn't smart enough to link in category methods. The flag above makes the linker link in all objective C classes and categories, not just ones it thinks it needs to based on analyzing your source. (Please feel free to tune or correct that answer. I'm knew to linked languages, so I'm just parroting here).
This happened to my because accidentally erase the " #IBAction func... " inside my UIViewcontroller class code, so in the Storyboard was created the Reference Outlet, but at runtime there was any function to process it.
The solution was to delete the Outlet reference inside the property inspector and then recreate it dragging with command key to the class code.
Hope it helps!
I think you should use the void, instead of the IBAction in return type. because you defined a button programmatically.
I had the same error and I discovered the following:
When you use the code
[self.refreshControl addTarget:self action:#selector(yourRefreshMethod:) forControlEvents:UIControlEventValueChanged];
You may think it's looking for the selector:
- (void)yourRefreshMethod{
(your code here)
}
But it's actually looking for the selector:
- (void)yourRefreshMethod:(id)sender{
(your code here)
}
That selector doesn't exist, so you get the crash.
You can change the selector to receive (id)sender in order to solve the error.
But what if you have other functions that call the refresh function without providing a sender? You need one function that works for both. Easy solution is to add another function:
- (void)yourRefreshMethodWithSender:(id)sender{
[self yourRefreshMethod];
}
And then modify the refresh pulldown code to call that selector instead:
[self.refreshControl addTarget:self action:#selector(yourRefreshMethodWithSender:) forControlEvents:UIControlEventValueChanged];
I'm also doing the Stanford iOS course on an older Mac that can't be upgraded to the newest version of Mac OSX. So I'm still building for iOS 6.1, and this solved the problem for me.
On my case I solved the problem after 2 hours :
The sender (a tabBar item) wasn't having any Referencing Outlet. So it was pointing nowhere.
Juste create a referencing outlet corresponding to your function.
Hope this could help you guys.
I'm currently learning iOS development and going through the "Beginning iOS6 Development" book by aPress. I was getting the same error in Chapter 10:Storyboards.
It took me two days to figure it out but found out I accidentally set the TableView cell's tag to 1 when I shouldn't have. For anyone else doing this book and receive a similar error I hope this helps.
I really hope future errors in my code are easier to find! hahaha. The debug error did nothing to push me in the right direction to figuring it out (or at least I'm too new to understand the debugger, lol).
In my case I was using a UIWebView and I passed a NSString in the second parameter instead of a NSURL. So I suspect that wrong class types passed to a functions can cause this error.
..And now mine
I had the button linked to a method which accessed another button's parameter and that worked great BUT as soon I tried to do something with the button itself, I got a crash. While compiling, no error has been displayed.. Solution?
I failed to link the button to the file's owner. So if anyone here is as stupid as me, try this :)
Yet another slightly different solution/case.
I am using Xamarin and MvvmCross and I was trying to bind the UIButton to a ViewModel. I had the UIButton wired up to an Outlet and a TouchUpInside.
When Binding I only use the Outlet:
set.Bind (somethingOutlet).For ("TouchUpInside").To(vm => vm.Something);
All I had to do was remove the action (TouchUpInside) connection in XCode and that solved it.
P.S.
I guess this is in its base all related to the previous answers and to #Chris Kaminski in particular, but I hope this helps someone...
Cheers.
I had the same issue. The problem for me was that one button had two Action methods. What I did was create a first action method for my button and then deleted it in the view controller, but forgot to disconnect the connection in the main storyboard in the connection inspector. So when I added a second action method, there were now two action methods for one button, which caused the error.
For me, it was a leftover connection created in interfacebuilder bij ctrl-dragging. The name of the broken connection was in the error-log
*** Terminating app due to uncaught exception 'NSInvalidArgumentException',
reason: '-[NameOfYourApp.NameOfYourClass nameOfCorruptConnection:]:
unrecognized selector sent to instance 0x7f97a48bb000'
I had an action linked to a button. Pressing the button crashed the app because the Outlet no longer existed in my code.
Searching for the name in the log led me to it in the storyboard. Deleted it, and the crash was gone!
I'm replying to Leonard Challis, since I was also taking the Stanford iOS class C193P, as was user "oli206"
"Terminating app due to uncaught exception 'NSInvalidArgumentException', reason:"
The problem was that I had the "Enter" button on the calculator connected twice,and a friend pointed out that doing an inspection of the button in the Storyboard showed that 2 entries were on the "Touch Up Inside" attributes when I right clicked on the "Enter" button. Erasing one of the two "Touch Up Inside" "Sent Events" solved the problem.
This showed that the problem is triggered (for the C193P video class on the Calculator Walkthrough on Assignment 1) as 2 sent events, one of which was causing the exception.
It can happen when you do not assign the ViewController to the ViewControllerScene in
the InterfaceBuilder. So the ViewController.m is not connected to any scene.
Including my share. I got stuck on this for a while, until I realized I've created a project with ARC(Automatic counting reference) disabled. A quick set to YES on that option solved my issue.
Another really silly cause of this is having the selector defined in the interface(.h) but not in the implementation(.m) (p.e. typo)
Another reason/solution to add to the list. This one is caused by iOS6.0 (and/or bad programming). In older versions the selector would match if the parameter types matched, but in iOS 6.0 I got crashes in previously working code where the name of the parameter wasn't correct.
I was doing something like
[objectName methodName:#"somestring" lat:latValue lng:lngValue];
but in the definition (both .h and .m) I had
(viod) methodName:(NSString *) latitude:(double)latitude longitude:(double)longitude;
This worked fine on iOS5 but not on 6, even the exact same build deployed to different devices.
I don't get why the compiler coudn't tell me this, anyway - problem soled.
This also might happen when you want to set a property from a ControllerA to a public property inside a custom ControllerB class and you haven't set the "Custom Class" inside the identity inspector in storyboards yet.
My problem and solution was different and I thought I should post it here so that future readers can save their head from banging to the wall.
I was allocating different xib to same UIVIewController and even after searching everywhere I couldn't find how to correct it. Then I checked my AppDelegate where I was calling initWithNibName and can see that while copying the code, I changed the xib name, but forgot to change UIViewController class. So if none of the solution works for you, check your initWithNibName method.
I've tried to read on apple documentation but I can't find anywhere how to capture key event (space or other) into an NSDocument application.
With initialFirstRepsodner if I've understand well it's not possible to do.
Any idea?
thanks to all!
Andrea
I've tried to read on apple documentation but I can't find anywhere how to capture key event (space or other) into an NSDocument application.
What do you want to handle key events for? You need to implement keyDown: somewhere, but exactly where depends on what you intend to do.
If you want to capture all the events going to a window, you can subclass it and override -sendEvent:. If you want to capture all the events in the entire app, you can override the same method in an NSApplication subclass.
For first, I'd like to thank Peter for help!
I've used hotkey and this sample has been very usefull!
http://dbachrach.com/blog/2005/11/program-global-hotkeys-in-cocoa-easily/
thanks to all!
Andrea
First of all you have to create a subclass of NSWindow.
In xcode do: File -> New File -> Objective C Class.
give a name like "NSWindowMyEvents". That will create 2 files: .h & .m, go to the NSWindowMyEvents.h and make the declaration as follows:
#interface NSWindowMyEvents : NSWindow {
}
Save changes and compile (to be sure that IB reads the new header 0 if it is already open).
Open interface builder and load your nib/xib file that contains your Document/Main Window.
Ensure that the "window" outlet of the File's owner is set to your main window.
Click on your main Window (the one that you want to get events) and set its class (via Identity inspector cmd+6) to be: NSWindowMyEvents instead of NSWindow that it is now.
Save changes!
Go back to xcode and NSWindowMyEvents.m and paste the following code:
- (void)keyDown:(NSEvent *)theEvent
{
NSLog(#"keyDown!");
if ([[NSApp currentEvent] modifierFlags] & NSCommandKeyMask)
{
NSLog(#"CommandKey Down!");
}
[super keyDown:theEvent];
}
Send the Event to super IF you want, to pass the event to the rest responder chain.
You are now handling keyboard Events.
Similarly you can handle any event in NSWindowMyEvent.m
Hope that helps....
I would recommend using NSUserDefaults and storing your shared global key combos and then checking keyDown: against those stored preferences and then basing your actions on what key was pressed.
ie: #define kMyKeyCommand #"i"