Top "Unrecognized-selector" questions

"Unrecognized selector" is an exception in Cocoa and Cocoa Touch, thrown when an object receives a message to which it cannot respond.

NSURLSession dataTaskForRequest:completion: unrecognized selector sent to instance

When trying to create my own session object NSURLSession() and request an url I get an unrecognized selector exception but …

ios swift nsurlsession unrecognized-selector
IBAction for UIButton Causes an unrecognized selector sent to instance error (iOS)

I am having trouble using some UIButtons to call actions in my Tab Bar application. My .h file: #import <…

ios xcode uibutton unrecognized-selector
Unrecognized selector sent to instance error message from UIButton

I have a UIButton that is added to a tableview programmatically. The problem is that when it is touched I …

ios objective-c iphone uibutton unrecognized-selector
-[NSCFDictionary length]: unrecognized selector

I have the next problem with this code: NSDictionary * imagen = [[NSDictionary alloc] initWithDictionary:[envio resultValue]]; NSString *imagenS = [imagen valueForKey:@"/Result"]; […

iphone objective-c nsdictionary unrecognized-selector
Unrecognized selector calling category method in static iOS library

I am using some third party software to aid in writing an iPad application using Xcode 4.3.2. The software is open …

objective-c ios unrecognized-selector
Unrecognized selector sent to instance while trying to open apple maps app in my app

I am trying to open up apple maps within the map that I created, and in the process of doing …

ios objective-c unrecognized-selector apple-maps
Sort descriptors with NSFetchedResultsController - Swift

I have a UITableView fed from Core Data with an NSFetchedResultsController returning the Location entities. The default sorting (and section …

swift nsfetchedresultscontroller nssortdescriptor unrecognized-selector sections
iPhone: Category with property + "unrecognized selector sent to instance" exception

First of all I have seen that there are many questions about "unrecognized selector sent to instance" issue. I have …

iphone objective-c unrecognized-selector objective-c-category