Is it possible to pass an int variable via a selector, eg #selector(run(1)) or #selector(run(2))
More context if necessary:
let button = UIBarButtonItem(title: "Run",
style: UIBarButtonItemStyle.Plain,
target: self,
action: #selector(run(1)))
After confirming to some iOS Developers, no you can't do this yet.
But there is an alternative. You can receive the sender object in the action method. You can add any property to the sender class. And receive that in action method.
for example:
let button = UIBarButtonItem(title: "Run",
style: .Plain,
target: self,
action: #selector(run(_:)))
button.tag = 1
And you can receive it like this
func run(sender: UIBarButtonItem) {
let passedInteger = sender.tag
}
But it only work if the passed parameter is a single Integer. Here's how you can do it if you want to pass multiple parameter with any data type -> Look at Second Approach
Subclass UIBarButtonItem
class MyBarButtonItem: UIBarButtonItem {
var passedParameter: String?
}
And receive it like this
let button = MyBarButtonItem(title: "Run",
style: .Plain,
target: self,
action: #selector(run(sender:)))
button.passedParameter = "John Doe"
func run(sender: MyBarButtonItem) {
// now you have the parameter
let parameter = sender.passedParameter
}
As of https://github.com/apple/swift-evolution/blob/master/proposals/0022-objc-selectors.md
#selector
is just typed safe way to declare your method. So it is all about method signature, you can't add static parameter to it
For example
let sel = #selector(UIView.insertSubview(_:atIndex:)) // produces the Selector "insertSubview:atIndex:"
No, but as Edward mentioned, it may be possible to pass values through the button itself.
let button = UIBarButtonItem(title: "Run",
style: UIBarButtonItemStyle.Plain,
target: self,
action: #selector(run(_:)))
button.tag = 1
.....
func run(sender: UIButton){
doSomething(sender.tag)
}
passing values through tags is not recommended but this is a way
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