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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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Why would I use an NSInvocation instead of a Block?

Can someone offer a concrete reason for using an NSInvocation instead of just using a Block, or even a regular method call? I am finding descriptions of NSInvocation around the Web, but no examples of where it is vital to use or even the only good…
user255468
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Get the sender of the message for an NSInvocation

How do I get the sender of the message wrapped in an `NSInvocation? I'm in an object, and I've just received an invocation in my forwardInvocation:. Is there any way to know who sent me the message in the first place?
unom
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How to create instance of my own class using NSInvocation?

I am trying to create a new instance of my custom class (custom init method call, with a BOOL parameter) dynamically. How can I use NSInvocation to do that? This is what I have so far: NSMethodSignature* signature = [NSClassFromString(className)…
user516542
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Over-riding NSObject and adding a class variable

I am using the following code to perform a selector after a delay with multiple passed parameters: http://nifty-box.com/blog/2006/12/nsinvocation-cleans-code.html It works very well, but I need to extend this to support the equivalent of: [NSObject…
Jeffrey Berthiaume
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Multicast Block: How to generalize

Goal I have a class with various properties that can be used to plug in a block to receive certain events. @interface SomeClass @property (copy, nonatomic) void (^handler)(int arg1, int arg2); @end In the client code, I would like to dynamically…
Etan
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NSTimer + NSInvocation causing crash on iOS 7

I'm running into a crash when using +[NSTimer scheduledTimerWithTimeInterval:invocation:repeats] on iOS 7. The code is straightforward enough; here is the copy paste (with variable renames) in its entirety. SEL selector =…
Dan Loewenherz
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CGRect gets corrupted when passed up the stack

I have these 4 lines of code inside a function void * someFunction() { ... code to create invocation and other things CGRect aRect; [invocation getReturnValue:&aRect]; finalValue = &aRect; return…
LombaX
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IOS NSMethodSignature stays nil

I recently started to develop for IOS and struggle with the Invocation Object. What i have is a Class "Location", derived from NSManagedObject (it's part of the Coredata model) @interface Location (CoreDataGeneratedAccessors) -…
billdoor
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NSTimer never fires

I've been having problems getting an NSTimer to fire, and I assumed it had to with multi-threading issues. Just to be sure I was creating the timer correctly, I created the following test code and I placed it into my main view controller's…
Regan
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NSTimer and NSInvocation, timer does not fire

First I create an NSInvocation, because the method I want to call with the timer has several parameters, which I set here NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[self…
Regan
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Mulptiple alloc of NSOperationQueue crashes my app

I update my tableview by loading json result from server using NSOperationQueue Adding queue: - (void)AddQueue { NSOperationQueue *queue = [NSOperationQueue new]; NSInvocationOperation *operation = [[NSInvocationOperation alloc]…
Pavel Kaljunen
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Get the results returned from an NSInvocationOperation

- (void)viewDidLoad { NSOperationQueue *operationQueue = [[NSOperationQueue alloc]init]; NSInvocationOperation *downloadImageOperation = [[NSInvocationOperation alloc] initWithTarget:[ImageDownloader getInstance] …
pvllnspk
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Custom button for cocos2d

I was working on creating my custom "Button" class... Im not using CCMenuItems because I need some flexibility in my buttons. My implementation is the following: DMenuButton : CCSprite When created, the button receives a…
Diego
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ARC [rewriter] NSInvocation's setArgument is not safe to be used with an object with ownership other than __unsafe_unretained

I been to convert my project to ARC and i m stuck with this error. &object,&invocation and &callerToRetain is showing me error of "[rewriter] NSInvocation's setArgument is not safe to be used with an object with ownership other than…
Bulla
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Passing a selector name as a method parameter

I'm writing a custom helper method that will get used a lot and return several buttons. Each button will of course have its own target selector when pressed, and I want to pass the selector as a parameter into this method so the returned button has…
johnbakers
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