19 lines
654 B
Swift
19 lines
654 B
Swift
|
// Source: http://stackoverflow.com/a/3732812/1123156
|
||
|
|
|
||
|
|
extension UIView {
|
||
|
|
func firstAvailableUIViewController() -> UIViewController? {
|
||
|
|
// convenience function for casting and to "mask" the recursive function
|
||
|
|
return traverseResponderChainForUIViewController()
|
||
|
|
}
|
||
|
|
|
||
|
|
func traverseResponderChainForUIViewController() -> UIViewController? {
|
||
|
|
if let nextUIViewController = next as? UIViewController {
|
||
|
|
return nextUIViewController
|
||
|
|
} else if let nextUIView = next as? UIView {
|
||
|
|
return nextUIView.traverseResponderChainForUIViewController()
|
||
|
|
} else {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|