Get method names for an Objective-C class in Swift

methodNames.swift

// - Playgorund code here
// - This code generates all (private/public) method titles which stored within EAAccessoryManager class

import Foundation
import ExternalAccessory
import PlaygroundSupport

PlaygroundPage.current.needsIndefiniteExecution = true


/// Given pointer to first element of a C array, invoke a function for each element
func enumerateCArray<T>(array: UnsafePointer<T>, count: UInt32, f: (UInt32, T) -> Void) {
    var ptr = array
    for i in 0..<count {
        f(i, ptr.pointee)
        ptr = ptr.successor()
    }
}

/// Return name for a method
func methodName(_ m: Method) -> String? {
    let sel = method_getName(m)
    
    let nameCString = sel_getName(sel)
    return String(validatingUTF8: nameCString)
}

/// Print the names for each method in a class
func printMethodNamesForClass(cls: AnyClass) {
    var methodCount: UInt32 = 0
    let methodList = class_copyMethodList(cls, &methodCount)
    if methodList != nil && methodCount > 0 {
        enumerateCArray(array: methodList!, count: methodCount) { (i, m) in
            let name = methodName(m) ?? "unknown"
            print("\(i): \(name)")
        }
        
        free(methodList)
    }
}

/// Print the names for each method in a class with a specified name
func printMethodNamesForClassNamed(classname: String) {
    // NSClassFromString() is declared to return AnyClass!, but should be AnyClass?
    let maybeClass: AnyClass? = NSClassFromString(classname)
    if let cls: AnyClass = maybeClass {
        printMethodNamesForClass(cls: cls)
    }
    else {
        print("\(classname): no such class")
    }
}

print("\nEAAccessoryManager:")
printMethodNamesForClass(cls: EAAccessoryManager.self)