CODEWITHSUNDEEP
swiftxcode
ilan
ilan

Reputation: 4462

Is there a way to get list of variables and function of a class

Is there a way to get list of variables and function of a class?

For example: If my class is like below

class Person {
    var age: Int!
    var name: String! 
    func isOlder(from person: Person) -> Bool { }
    func hasSameName(as person: Person) -> Bool { }
}

I want to get 2 lists:

1. [age, name]
2. [isOlder( _ : ), hasSameName( _ : )]

Or something similar.

Thanks

Upvotes: 10

Views: 6157

Answers (4)

black_pearl
black_pearl

Reputation: 2699

Code refactor for @Anton Plebanovich's answer

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")
    }
}

func printMethodNamesForClass(cls: AnyClass) {
    var methodCount: UInt32 = 0
    let methodList = class_copyMethodList(cls, &methodCount)
    if let methodList = methodList{
        let arr = Array(arrayLiteral: methodList)
        for (i, m) in arr.enumerated(){
            let name: String = methodName(m: m.pointee) ?? "Not Known"
            print("#\(i): \(name)")
        }
        free(methodList)
    }
}

func methodName(m: Method) -> String? {
    let sel = method_getName(m)
    let nameCString = sel_getName(sel)
    return String(cString: nameCString)
}

Upvotes: 0

Anton Plebanovich
Anton Plebanovich

Reputation: 1516

Swift 4:

func printMethodNamesForClass(cls: AnyClass) {
    var methodCount: UInt32 = 0
    let methodList = class_copyMethodList(cls, &methodCount)
    if let methodList = methodList, methodCount > 0 {
        enumerateCArray(array: methodList, count: methodCount) { i, m in
            let name = methodName(m: m) ?? "unknown"
            print("#\(i): \(name)")
        }

        free(methodList)
    }
}
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()
    }
}
func methodName(m: Method) -> String? {
    let sel = method_getName(m)
    let nameCString = sel_getName(sel)
    return String(cString: nameCString)
}
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")
    }
}

Upvotes: 11

Saranjith
Saranjith

Reputation: 11567

In Objective C

#import <objc/runtime.h>

getDetailsOfClass(Class clz) {

    unsigned int methodCount = 0;
    Method *methods = class_copyMethodList(clz, &methodCount);

    printf("Found %d methods on '%s'\n", methodCount, class_getName(clz));

    for (unsigned int i = 0; i < methodCount; i++) {
        Method method = methods[i];

        printf("\t'%s' has method named '%s' of encoding '%s'\n",
               class_getName(clz),
               sel_getName(method_getName(method)),
               method_getTypeEncoding(method));
    }

    free(methods);
}

Invoke: getDetailsOfClass(class)

In Swift

Follow the SO Post. Have implemented same and found success.

To get Method names:

func printMethodNamesForClass(cls: AnyClass) {
    var methodCount: UInt32 = 0
    let methodList = class_copyMethodList(cls, &methodCount)
    if methodList != nil && methodCount > 0 {
        enumerateCArray(methodList, methodCount) { i, m in
            let name = methodName(m) ?? "unknown"
            println("#\(i): \(name)")
        }

        free(methodList)
    }
}
func enumerateCArray<T>(array: UnsafePointer<T>, count: UInt32, f: (UInt32, T) -> ()) {
    var ptr = array
    for i in 0..<count {
        f(i, ptr.memory)
        ptr = ptr.successor()
    }
}
func methodName(m: Method) -> String? {
    let sel = method_getName(m)
    let nameCString = sel_getName(sel)
    return String.fromCString(nameCString)
}
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)
}
else {
println("\(classname): no such class")
}
}

Happy Coding..

Upvotes: 5

G&#246;ksel K&#246;ksal
G&#246;ksel K&#246;ksal

Reputation: 233

I believe you can use Mirror API for this: https://developer.apple.com/documentation/swift/mirror

New key-path API in Swift 4 might also be helpful: https://github.com/apple/swift-evolution/blob/master/proposals/0161-key-paths.md

Upvotes: 1

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