Open Radar

 
Summary:
`respondsToSelector` doesn't work with generic classes. Since it seems like UIKit uses `respondsToSelector` internally this can cause crashes when using generic classes in combination with `UIViewController`s or `UITableViewDataSource`.

Steps to Reproduce:
// with Generics
public class ArrayDataSource<T>: NSObject, UITableViewDataSource { ... }

var ds = ArrayDataSource<String>()
ds.respondsToSelector("tableView:numberOfRowsInSection:") // false

// without Generics
public class ArrayDataSource2: NSObject, UITableViewDataSource { ... }

var ds2 = ArrayDataSource2()
ds2.respondsToSelector("tableView:numberOfRowsInSection:") // true

Expected Results:
`respondsToSelector:` should do its job

Actual Results:
It just doesn't work, which will also lead to crashes since `respondToSelector:` seems to be used in multiple frameworks. So when you use generic classes with for example UITableView it will lead to an crash.

Version:
iOS 8.1.1, Xcode 6.1.1

Notes:
This issue got found when having troubles with UITableViewDataSource implemented as generic class. See the following StackOverflow question for more details: http://stackoverflow.com/questions/27483560/nsinvalidargumentexception-when-putting-uitableviewdatasource-in-its-own-class/27638112#27638112

Configuration:
Seems to be any configuration, tested on iPhone 5 and the Simulator

Attachments: