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Questions tagged [nsinvocation]

An NSInvocation object contains all the elements of an Objective-C message: a target, a selector, arguments, and the return value. Each of these elements can be set directly, and the return value is set automatically when the NSInvocation object is dispatched.

Resource

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NSInvocation returning nil

Does anyone know how can I set the argument of NSInvocation to be nil ? I am trying to use OCMock and I would like this expectation to return nil. The problem is that I need to do something else when the method is called, as you can see in the…
Nicolas Yuste
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NSInvocation & NSTimer - Method gets called twice

I've created a small app, which has a UISegmentedControl with to segments and a UITableView. When the selected segment changes, the data in the TableView (which is download from a server) should change. Therefore I have a method -…
Codey
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Uploading files in background mode

I have two views: myFristView and mySecondView, in myFristView I have a code which can read the fields in my database and then send to a PHP server, this code NSInvocationOperation using this class to send the files in background mode. The process…
user3781174
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How to store an init call in an NSInvocation?

I'm trying to set up an app that works with UIPageViewController. I technically could instantiate all the view at once and put them in an array, but that would be expensive, and it seems better to initialize the views as needed. I read that an…
PopKernel
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Get object array argument from NSInvocation with ARC

I have a method with the following signature: - (void)takeIntsAndRecieveIntsAsync:(MyInt *__strong []) completion:(void (^)(MyInt * __strong response[]))success; I had a couple of questions: 1. How do I retrieve the…
pshah
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NSProxy and forwardInvocation: invoke called within a block causes nil return value

I am using a NSProxy subclass and forwardInvocation: for capturing calls to my Backend API object (a shared instance). Some Background information: I want to capture the API calls so I can check everytime if I have to refresh my authentication…
orschaef
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Function with argument to a NSInvocation method

I have a controller view who is using thoses 2 functions: [appDelegate getFichesInfo:[[self.fichesCategory idModuleFiche] intValue] ]; //first function self.fiche = (Fiche *)[appDelegate.fichesInfo objectAtIndex:0]; [appDelegate…
ludo
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NSInvocation needing NSMethodSignature

I have been wondering for a couple of days if NSInvocation should need the NSMethodSignature. Lets say we want to write our own NSInvocation, my requirements would be as so: I need a selector SEL The target object to call the selector on The…
Omar Abdelhafith
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Invoking a method on a delegate after delay, from an object at the end of it's lifetime

I have a modal view controller that creates core data changes in it's own context, and when I click done, it saves the changes (that dispatches the merge changes notification), notifies the delegate and dismisses. My problem is that I need the…
Michael Waterfall
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Expect Argument Type to be integer but getting id instead

I'm using the forwardInvocation: feature of objective-c and I need to know what type of argument the method received. In my example I'm passing it an int but getArgumentTypeAtIndex: tells me it's an id instead. Here's a simple example: @interface…
bendytree
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Unexpected exception with NSInvocation

Following code throws an exception. vcClass is a Class object (inheritor from UIViewController). Self contains my implementation of viewWillAppear: SEL viewWillAppearSEL = @selector(viewWillAppear:); IMP viewWillAppearWithSuperIMP = [self…
user1248568
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Multiple parameters for @selector

I am creating a game in objective C, and I am stopped by a matter : I have a warning for passing multiple variables on @selector. What I want to do, is call a method in my UIViewController but after a delay. So I try to make a first method, that…
user2057209
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NSInvocation problems

So I am running into some issues when I am trying to load information from a file. myMutableArray=[[NSKeyedUnarchiver unarchiveObjectWithFile:dataFile]retain]; This is the line that gives me the NSinvocation problems * NSInvocation: warning:…
Alfree92
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Should NSInvocation passes self as 2d indice argument?

I am using cocos2d for developing. I have tried to wrap a customized button class. When trying to make the button respond to the selector I assigned to it, I used NSInvocation. In it, the MyButton works like this. if( target && sel ) { …
analysiser
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NSInvocation throws exception

I'm trying to use an NSTimer with invocation but i have problems with 2 things. I don't know how to get the Selector to pass Arguments(Xcode crys) or how to get it work in general since it always crashs. X = [NSTimer…
Coltan
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