Asked 6 years ago. Modified 8 months ago. Viewed 24k times. TouchUpInside event: button. Using the Selector class? Thank you! Improve this question. Moin Shirazi 4, 2 2 gold badges 25 25 silver badges 37 37 bronze badges. You can check details in New Features in Swift 2. Add a comment. Sorted by: Reset to default. Highest score default Trending recent votes count more Date modified newest first Date created oldest first.
Help us improve our answers. Are the answers below sorted in a way that puts the best answer at or near the top? You did it the right way: button. TouchUpInside why do we need to pass the objc keyword and how it affects the function? Improve this answer. Alex Zavatone 3, 35 35 silver badges 53 53 bronze badges. Avt Avt You can still create selectors from strings even in Swift 4. I would dare imagine objc is also needed if your class isn't in the NSObject hierarchy? Which admittedly will be rare as it's most likely you'll be receiving UI feedback and therefore that you are a UIViewController descendent.
Didn't know that private functions can be selectors with the objc attribute! Great, thanks! Programmatically button. Wasim Wasim 9 9 silver badges 12 12 bronze badges. TouchUpInside 3: Usually you not have to use the objc attribute. Darko Darko 9, 9 9 gold badges 30 30 silver badges 42 42 bronze badges. Everyones's answers are perfect but I have a better approach. Hope you gonna like it. For swift3. Maishi Wadhwani Maishi Wadhwani 1, 15 15 silver badges 24 24 bronze badges.
Sign up or log in Sign up using Google. However, current versions of Swift use a type-safe syntax to construct selectors. If your method has parameters, like this for example :. However, if the method name is unambiguous without giving the parameters, then you don't have to list them in the selector. In the above case, this works, too:. FWIW, you can still constructors using strings, but you need to know what the Obj-C version of the method name is going to be.
For example, with this function:. You can supply a class name when using the. You can construct a selector from a raw String. In this case you must make sure that the selector is correctly formed according to Obj-C rules. You can construct a selector from the Swift name of a function.
In this case, the name must be qualified enough for the compiler to know which function you mean. In general, that means you must say what class the function belongs to, and say what the parameter names are. The complication is that a selector is derived from the Obj-C name of a method, which is not the same as the Swift name — it doesn't have the same syntax, and there's a conversion rule that the Swift compiler follows, which isn't obvious.
Where are you getting the name the method as a String from? In general, just knowing the Swift name isn't enough to be able to construct the correct selector. The problem is that I want to subclass a Combobox Control whose content is unknown and is loaded at run time by a webserver and I also hav pther reasons to subclass controls.
I dont want to user outlets like in Eskimo solution, because I will have more than hundred window controllers in the program, with zoen of controls each, and outlets are too heavy to implemet. So lets say that in a window Controller, I have 2 combobox controls with identifier "filter1" for the first and "filter2" for the second. Now, If I iterate in an other class, to make it harder on the list of controls, I have somewhere in that other class:.
To make this work, you need to know the Obj-C method name i. There are two ways to approach this:. Note that there is one ":" because the method has one parameter. Then you can construct the string for the selector as:.
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You can type only #selector(selector(_:)) if the selector is in the same class of the caller. _: means that accept one parameter. So, if it. arthagrha.online › documentation › using_objective-c_runtime_featur. In Objective-C, a selector is a type that refers to the name of an Objective-C method. In Swift, Objective-C selectors are represented by the Selector structure.