Hello
I'm sorry to ask you something I can't do, but I'm having trouble because I don't know how to implement the protocol.
I would appreciate it if someone could reply.
For reasons such as containerView, one ViewController has multiple ViewControllers in its properties (array called viewControllers) and I will make sure that each ViewController has one tableView.
override func setEditing(_editing:Bool, animated:Bool){
super.setEditing (editing, animated: animated)
iflet firstVC = viewControllers [currentIndex] as ? FirstViewController {
firstVC.tableView.isEditing=editing
}
iflet secondVC = viewControllers [currentIndex] as ? SecondViewController {
secondVC.tableView.isEditing=editing
}
iflet thirdVC = viewControllers [currentIndex] as ? ThirdViewController {
thirdVC.tableView.isEditing=editing
}
}
It's good to downcast each one like this, but I think it's a bit monotonous.
I would like to have a UIViewController class that has tableView as the parent of ViewControllers in the array.
How do I implement it in Swift language using protocols...?
I'm not sure if it's a good feeling or not, but if I only take the part that says, "Use protocol in Swift language," it'll look like this.
protocolHavingTableView{
variableView:UITableView!{get}
}
extension FirstViewController:HavingTableView{}
extensionSecondViewController:HavingTableView{}
extensionThirdViewController:HavingTableView{}
//...
override func setEditing(_editing:Bool, animated:Bool) {
super.setEditing (editing, animated: animated)
iflettableViewVC = viewControllers [currentIndex] as ? US>HavingTableView {
tableViewVC.tableView.isEditing=editing
}
}
The current Swift cannot combine classes and protocols to create a data type like UIViewController&HavingTableView, so the viewControllers are assumed to be [UIViewController]Then as? You may need a cast like HavingTableView, and it may not look very "good."
If you say, "I want a UIViewController class that has tableView as the parent of ViewControllers in an array," you can define it as a common parent class.
class MyBaseViewController:UIViewController {
variableView —UITableView!
}
class FirstViewController:MyBaseViewController {
//...
}
classSecondViewController:MyBaseViewController {
//...
}
classThirdViewController:MyBaseViewController {
//...
}
//...
varviewControllers: MyBaseViewController = [ ]
override func setEditing(_editing:Bool, animated:Bool) {
super.setEditing (editing, animated: animated)
viewControllers [currentIndex].tableView.isEditing=editing
}
I personally think this is better, but if you want tableView to be @IBOutlet, it might be a bit troublesome.
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