I briefly considered something like this but didn't explore it. Elegant.
Sent from my iPhone, please excuse brevity and errors
> On Jun 3, 2017, at 9:38 PM, Geordie Jay <geo...@gmail.com> wrote:
>
> I am dealing with a variant of this on Android right now. I have just
> subclassed e.g. UITapGestureRecognizer to perform the 2nd variant above and
> externally accept a closure as its argument. I'm writing this on my phone so
> forgive any syntax errors or accidental omissions:
>
> class TapGestureRecognizer: UITapGestureRecognizer {
> var onTap: (() -> Void)?
> init(onTap: (() -> Void)?) {
> self.onTap = onTap
> super.init(target: self, action: #selector(internalTapHandler))
> }
>
> @objc private func internalTapHandler() {
> onTap?()
> }
> }
>
> class Baz: Foo {
> init() {
> let tapRecognizer = TapGestureRecognizer(onTap: self.bar)
> }
> }
>
>
> Cheers,
> Geordie
>> On Sat 3. Jun 2017 at 16:53, Nate Birkholz via swift-users
>> <swift-users@swift.org> wrote:
>> Thanks, the second had occurred to me, but felt a little too much like in
>> practice it would make the code harder to understand.
>>
>>> On Fri, Jun 2, 2017 at 9:58 PM, Zhao Xin <owe...@gmail.com> wrote:
>>> I found two workarounds.
>>>
>>> 1.
>>> protocol Foo: class {
>>> func bar()
>>> }
>>>
>>> class Base:Foo {
>>> @objc func bar() {
>>> print("bar")
>>> }
>>> }
>>>
>>> class Baz: Base {
>>> override init() {
>>> super.init()
>>> let tapRecognizer = UITapGestureRecognizer(target: self, action:
>>> #selector(bar))
>>> }
>>> }
>>>
>>> 2.
>>> protocol Foo: class {
>>> func bar()
>>> }
>>>
>>> extension Foo {
>>> func bar() {
>>> print("bar")
>>> }
>>> }
>>>
>>> class Baz: Foo {
>>> init() {
>>> let tapRecognizer = UITapGestureRecognizer(target: self, action:
>>> #selector(delegate))
>>> }
>>>
>>> @objc func delegate() {
>>> bar()
>>> }
>>> }
>>>
>>>
>>> Zhao Xin
>>>
>>>
>>>
>>>
>>>
>>>
>>>> On Sat, Jun 3, 2017 at 10:35 AM, Nate Birkholz via swift-users
>>>> <swift-users@swift.org> wrote:
>>>> protocol Foo: class {
>>>> func bar()
>>>> }
>>>>
>>>> extension Foo {
>>>> func bar() {
>>>> print("bar")
>>>> }
>>>> }
>>>>
>>>> class Baz: Foo {
>>>> init() {
>>>> let tapRecognizer = UITapGestureRecognizer(target: self, action:
>>>> #selector(bar))
>>>> }
>>>> }
>>>>
>>>> the #selector tells me: "Argument of '#selector' refers to instance method
>>>> 'bar()' that is not exposed to Objective-C" and asks me to add @objc to
>>>> the method definition.
>>>>
>>>> Adding @objc to the method tells me: "@objc can only be used with members
>>>> of classes, @objc protocols, and concrete extensions of classes"
>>>>
>>>> Adding @objc to the protocol doesn't fix it, just introduces new issues.
>>>>
>>>> "dynamic" cannot be applied to a protocol, so cannot be used
>>>> alternatively.
>>>>
>>>> Is there a way to get around this? If a method is called by a gesture
>>>> recognizer, is there no way to have a default protocol implementation? I'd
>>>> like to use default implementations if possible to make my code more DRY.
>>>>
>>>> Is there a roadmap/plan for swift-native selector dispatch?
>>>>
>>>> Thanks. I look forward to the inevitable reply revealing the dumb thing I
>>>> missed. :)
>>>>
>>>> --
>>>> Nate Birkholz
>>>>
>>>> _______________________________________________
>>>> swift-users mailing list
>>>> swift-users@swift.org
>>>> https://lists.swift.org/mailman/listinfo/swift-users
>>>>
>>>
>>
>>
>>
>> --
>> Nate Birkholz
>> _______________________________________________
>> swift-users mailing list
>> swift-users@swift.org
>> https://lists.swift.org/mailman/listinfo/swift-users
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