![How to use it?
extension Bundle {
func retrieveAllViewControllers() -> [String] {
guard let bundlePath = self.executablePath else { return [] }
var viewControllers = [String]()
var size: UInt32 = 0
let classes = objc_copyClassNamesForImage(bundlePath, &size)
for index in 0..<size {
if let className = classes?[Int(index)],
let name = NSString.init(utf8String:className) as String?,
NSClassFromString(name) is UIViewController.Type
{
viewControllers.append(name)
}
}
return viewControllers
}
}](https://image.slidesharecdn.com/howtobuildadebugviewforfree-slideshare-181012080529/85/How-to-instantiate-any-view-controller-for-free-11-320.jpg)
![How to use it?
extension Bundle {
func retrieveAllViewControllers() -> [String] {
guard let bundlePath = self.executablePath else { return [] }
var viewControllers = [String]()
var size: UInt32 = 0
let classes = objc_copyClassNamesForImage(bundlePath, &size)
for index in 0..<size {
if let className = classes?[Int(index)],
let name = NSString.init(utf8String:className) as String?,
NSClassFromString(name) is UIViewController.Type
{
viewControllers.append(name)
}
}
return viewControllers
}
}](https://image.slidesharecdn.com/howtobuildadebugviewforfree-slideshare-181012080529/85/How-to-instantiate-any-view-controller-for-free-12-320.jpg)
![How to use it?
extension Bundle {
func retrieveAllViewControllers() -> [String] {
guard let bundlePath = self.executablePath else { return [] }
var viewControllers = [String]()
var size: UInt32 = 0
let classes = objc_copyClassNamesForImage(bundlePath, &size)
for index in 0..<size {
if let className = classes?[Int(index)],
let name = NSString.init(utf8String:className) as String?,
NSClassFromString(name) is UIViewController.Type
{
viewControllers.append(name)
}
}
return viewControllers
}
}](https://image.slidesharecdn.com/howtobuildadebugviewforfree-slideshare-181012080529/85/How-to-instantiate-any-view-controller-for-free-13-320.jpg)
![How to use it?
extension Bundle {
func retrieveAllViewControllers() -> [String] {
guard let bundlePath = self.executablePath else { return [] }
var viewControllers = [String]()
var size: UInt32 = 0
let classes = objc_copyClassNamesForImage(bundlePath, &size)
for index in 0..<size {
if let className = classes?[Int(index)],
let name = NSString.init(utf8String:className) as String?,
NSClassFromString(name) is UIViewController.Type
{
viewControllers.append(name)
}
}
return viewControllers
}
}](https://image.slidesharecdn.com/howtobuildadebugviewforfree-slideshare-181012080529/85/How-to-instantiate-any-view-controller-for-free-14-320.jpg)
![How to use it?
extension Bundle {
func retrieveAllViewControllers() -> [String] {
guard let bundlePath = self.executablePath else { return [] }
var viewControllers = [String]()
var size: UInt32 = 0
let classes = objc_copyClassNamesForImage(bundlePath, &size)
for index in 0..<size {
if let className = classes?[Int(index)],
let name = NSString.init(utf8String:className) as String?,
NSClassFromString(name) is UIViewController.Type
{
viewControllers.append(name)
}
}
return viewControllers
}
}](https://image.slidesharecdn.com/howtobuildadebugviewforfree-slideshare-181012080529/85/How-to-instantiate-any-view-controller-for-free-15-320.jpg)
![Defining debug use cases
@objc public protocol ControllerFactoryUseCaseCompliant {
static func getUseCases() -> [String]
func prepareForControllerFactory(useCase: String)
}
extension MyViewController: ControllerFactoryUseCaseCompliant {
static func getUseCases() -> [String] {
return ["Case 1", "Case 2"]
}
func prepareForControllerFactory(useCase: String) {
// do some configuration according to `useCase`
}
}](https://image.slidesharecdn.com/howtobuildadebugviewforfree-slideshare-181012080529/85/How-to-instantiate-any-view-controller-for-free-19-320.jpg)
![Defining debug use cases
@objc public protocol ControllerFactoryUseCaseInstantiable {
static func getUseCases() -> [String]
static func initForControllerFactory(useCase: String) -> UIViewController
}
extension MyViewController: ControllerFactoryUseCaseInstantiable {
static func getUseCases() -> [String] {
return ["Case 1", "Case 2"]
}
static func initForControllerFactory(useCase: String) -> UIViewController {
// do some configuration according to `useCase`
}
}](https://image.slidesharecdn.com/howtobuildadebugviewforfree-slideshare-181012080529/85/How-to-instantiate-any-view-controller-for-free-21-320.jpg)
How to instantiate any view controller for free
- 1. How to instantiate any controller for free Benoît Caron & Vincent Pradeilles – Worldline Insert clickbait here
- 2. Why?
- 3. Why? You have to make sure an app displays properly on the iPhone X, but: • Data is driven by web-services • No mocks are available • More than 150 different screens • Some screens are part of complex business scenarios
- 4. What’s the right tool?
- 5. A debug view! • Lists all available UIViewControllers • Search bar and index • Indicate a specific use case, if needed • Instantiates and pushes or presents the controller
- 6. How do we get the data?
- 7. Objective-C
- 9. The ObjectiveC module • Exposes C APIs to interact with the ObjectiveC runtime • Perfectly OK to use it with Swift • More information: https://vimeo.com/107707576 • Swift and C - Mike Ash - NSSpain 2014
- 10. The ObjectiveC module public func objc_copyClassNamesForImage(_ image: UnsafePointer<Int8>, _ outCount: UnsafeMutablePointer<UInt32>?) -> UnsafeMutablePointer<UnsafePointer<Int8>>? • This function returns a list of all the classes defined in a given bundle • That’s all the data you’ll ever need to build a basic debug view
- 11. How to use it? extension Bundle { func retrieveAllViewControllers() -> [String] { guard let bundlePath = self.executablePath else { return [] } var viewControllers = [String]() var size: UInt32 = 0 let classes = objc_copyClassNamesForImage(bundlePath, &size) for index in 0..<size { if let className = classes?[Int(index)], let name = NSString.init(utf8String:className) as String?, NSClassFromString(name) is UIViewController.Type { viewControllers.append(name) } } return viewControllers } }
- 12. How to use it? extension Bundle { func retrieveAllViewControllers() -> [String] { guard let bundlePath = self.executablePath else { return [] } var viewControllers = [String]() var size: UInt32 = 0 let classes = objc_copyClassNamesForImage(bundlePath, &size) for index in 0..<size { if let className = classes?[Int(index)], let name = NSString.init(utf8String:className) as String?, NSClassFromString(name) is UIViewController.Type { viewControllers.append(name) } } return viewControllers } }
- 13. How to use it? extension Bundle { func retrieveAllViewControllers() -> [String] { guard let bundlePath = self.executablePath else { return [] } var viewControllers = [String]() var size: UInt32 = 0 let classes = objc_copyClassNamesForImage(bundlePath, &size) for index in 0..<size { if let className = classes?[Int(index)], let name = NSString.init(utf8String:className) as String?, NSClassFromString(name) is UIViewController.Type { viewControllers.append(name) } } return viewControllers } }
- 14. How to use it? extension Bundle { func retrieveAllViewControllers() -> [String] { guard let bundlePath = self.executablePath else { return [] } var viewControllers = [String]() var size: UInt32 = 0 let classes = objc_copyClassNamesForImage(bundlePath, &size) for index in 0..<size { if let className = classes?[Int(index)], let name = NSString.init(utf8String:className) as String?, NSClassFromString(name) is UIViewController.Type { viewControllers.append(name) } } return viewControllers } }
- 15. How to use it? extension Bundle { func retrieveAllViewControllers() -> [String] { guard let bundlePath = self.executablePath else { return [] } var viewControllers = [String]() var size: UInt32 = 0 let classes = objc_copyClassNamesForImage(bundlePath, &size) for index in 0..<size { if let className = classes?[Int(index)], let name = NSString.init(utf8String:className) as String?, NSClassFromString(name) is UIViewController.Type { viewControllers.append(name) } } return viewControllers } }
- 16. How to use it? func classFromString(_ className: String) -> AnyClass? { let cls: AnyClass? = NSClassFromString(className) return cls } That’s it
- 17. Current state • We are able to list all the controllers of an app • We are limited to the initializers provided by UIViewController • We can’t provide initial data
- 18. Configure for debug @objc public protocol ControllerFactoryCompliant { func prepareForControllerFactory() } extension MyViewController: ControllerFactoryCompliant { func prepareForControllerFactory() { // do some configuration } }
- 19. Defining debug use cases @objc public protocol ControllerFactoryUseCaseCompliant { static func getUseCases() -> [String] func prepareForControllerFactory(useCase: String) } extension MyViewController: ControllerFactoryUseCaseCompliant { static func getUseCases() -> [String] { return ["Case 1", "Case 2"] } func prepareForControllerFactory(useCase: String) { // do some configuration according to `useCase` } }
- 20. Configure for debug @objc public protocol ControllerFactoryInstantiable { static func initForControllerFactory() -> UIViewController } extension MyViewController: ControllerFactoryInstantiable { static func initForControllerFactory() -> UIViewController { let storyboard = UIStoryboard(name: "Main", bundle: nil) let viewController = storyboard.instantiateViewController("MyViewController") as! MyViewController return viewController } }
- 21. Defining debug use cases @objc public protocol ControllerFactoryUseCaseInstantiable { static func getUseCases() -> [String] static func initForControllerFactory(useCase: String) -> UIViewController } extension MyViewController: ControllerFactoryUseCaseInstantiable { static func getUseCases() -> [String] { return ["Case 1", "Case 2"] } static func initForControllerFactory(useCase: String) -> UIViewController { // do some configuration according to `useCase` } }
- 22. Does it work?
- 24. How to use it in a project?
- 25. How to use it in a project? • Available on Github : https://github.com/worldline/ControllerFactory • Works with CocoaPods and Carthage • Open Source (MIT License)
- 26. Questions?
- 27. Thank you!