Get List of all native classes

Question

I want to get all the native classes (NSString, NSNumber, int, float, NSSet, NSDictionary) that I have loaded into my iOS Project..

i.e., if I have created a custom class named "TestClass" I don't want it listed...

I have already got a code but it returns names of all classes loaded any way I can modify the code to limit the list to Native classes only?

#import <objc/runtime.h>
#import <dlfcn.h>
#import <mach-o/ldsyms.h>


unsigned int count;
const char **classes;
Dl_info info;

dladdr(&_mh_execute_header, &info);
classes = objc_copyClassNamesForImage(info.dli_fname, &count);

for (int i = 0; i < count; i++) {
  NSLog(@"Class name: %s", classes[i]);
  Class class = NSClassFromString ([NSString stringWithCString:classes[i] encoding:NSUTF8StringEncoding]);
  // Do something with class

}

Answer 1

You would get all loaded classes with

int numClasses;
Class * classes = NULL;

classes = NULL;
numClasses = objc_getClassList(NULL, 0);

if (numClasses > 0 )
{
    classes = (__unsafe_unretained Class *)malloc(sizeof(Class) * numClasses);
    numClasses = objc_getClassList(classes, numClasses);
    for (int i = 0; i < numClasses; i++) {
        Class c = classes[i];
        NSLog(@"%s", class_getName(c));
    }
    free(classes);
}

(Code from objc_getClassList documentation.)

To restrict the list, you can check the bundle from which the class was loaded, e.g.

Class c = classes[i];
NSBundle *b = [NSBundle bundleForClass:c];
if (b != [NSBundle mainBundle])
    ...

for all classes that are not loaded from your application.

Answer 2

Here's a pure Swift solution with Swift 3:

var numClasses: Int32 = 0
var allClasses: AutoreleasingUnsafeMutablePointer<AnyClass?>? = nil
defer {
    allClasses = nil
}

numClasses = objc_getClassList(nil, 0)

if numClasses > 0 {
    var ptr = UnsafeMutablePointer<AnyClass?>.allocate(capacity: Int(numClasses))
    defer {
        ptr.deinitialize()
        ptr.deallocate(capacity: Int(numClasses))
    }
    allClasses = AutoreleasingUnsafeMutablePointer<AnyClass?>(ptr)
    numClasses = objc_getClassList(allClasses, numClasses)

    for i in 0 ..< numClasses {
        if let currentClass: AnyClass = allClasses?[Int(i)] {
            print("\(currentClass)")
        }
    }
}

Original solution with Swift 2.2/Xcode 7.3:

var numClasses: Int32 = 0
var allClasses: AutoreleasingUnsafeMutablePointer<AnyClass?> = nil
defer {
    allClasses = nil
}

numClasses = objc_getClassList(nil, 0)

if numClasses > 0 {
    var ptr = UnsafeMutablePointer<AnyClass>.alloc(Int(numClasses))
    defer {
        ptr.destroy()
        ptr.dealloc(Int(numClasses))
        ptr = nil
    }
    allClasses = AutoreleasingUnsafeMutablePointer<AnyClass?>.init(ptr)
    numClasses = objc_getClassList(allClasses, numClasses)

    for i in 0 ..< numClasses {
        if let currentClass: AnyClass = allClasses[Int(i)] {
            print("\(currentClass)")
        }
    }
}

Note that due to the way Swift handles weak pointers (protip: it doesn't), your classes will be overreleased with this code. I've opened SR-1068 about bridging __weak and __unsafe_unretained pointers to Swift. __weak pointers are bridged as UnsafeMutablePointer while __unsafe_unretained pointers are bridged as AutoreleasingUnsafeMutablePointer, which causes the overrelase.

Fortunately, Classes don't do anything on release, so this code is relatively safe, at least for now.

Answer 3

Using Runtime it is possible to:

Objective-C

#import <objc/runtime.h>

- (void) printClassNames {
    int amountClasses = objc_getClassList(NULL, 0);
    printf("Amount of classes: %d", amountClasses);

    Class *classes = (__unsafe_unretained Class *)malloc(sizeof(Class) * amountClasses);
    amountClasses = objc_getClassList(classes, amountClasses);

    for (int i = 0; i < amountClasses; i++) {
        Class class = classes[i];

        if ([NSBundle bundleForClass:class] != [NSBundle mainBundle]) { // restriction that pass classes from main bundle
            continue;
        }

        printf("Class name: %s", class_getName(class));

        [self printPropertyNamesForClass:class];
        [self printMethodNamesForClass:class];

    }

    free(classes);
}

- (void) printPropertyNamesForClass:(Class) class {
    uint count;
    objc_property_t* properties = class_copyPropertyList(class, &count);

    for (int i = 0; i < count ; i++) {

        const char* propertyName = property_getName(properties[i]);
        printf("\t Property name: %s \n", propertyName);
    }
    free(properties);
}

- (void) printMethodNamesForClass:(Class) class {
    //List of all methods
    unsigned int amountMethod = 0;
    Method *methods = class_copyMethodList(class, &amountMethod);

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

        printf("\t method named:'%s' \n", sel_getName(method_getName(method)));
    }

    free(methods);
}

Swift

func printClassNames() {

    let amountClasses = objc_getClassList(nil, 0)
    print("Amount of classes: \(amountClasses)")

    var classes = [AnyClass](repeating: NSObject.self, count: Int(amountClasses))
    classes.withUnsafeMutableBufferPointer { buffer in
        let autoreleasingPointer = AutoreleasingUnsafeMutablePointer<AnyClass>(buffer.baseAddress)
        objc_getClassList(autoreleasingPointer, amountClasses)
    }

    for currentClass in classes {

        guard Bundle(for: currentClass) == Bundle.main else {continue}
        print("Class name:\(currentClass)")

        printPropertyNamesForClass(currentClass)
        printMethodNamesForClass(currentClass)
    }

}

func printPropertyNamesForClass(_ currentClass : AnyClass) {
    var count = UInt32()
    let propertyList = class_copyPropertyList(currentClass, &count)
    let intCount = Int(count)

    guard let properties = propertyList, intCount > 0 else {return}

    for i in 0 ..< intCount {
        let property : objc_property_t = properties[i]

        let nameCString = property_getName(property)
        print("\t Property name:\(String(cString: nameCString))");

    }

    free(properties)
}

func printMethodNamesForClass(_ currentClass: AnyClass) {
    var methodCount: UInt32 = 0
    let methodList = class_copyMethodList(currentClass, &methodCount)

    guard let methods = methodList, methodCount > 0 else {return}

    var ptr = methods
    for _ in 0 ..< methodCount {

        let sel = method_getName(ptr.pointee)
        ptr = ptr.successor()

        let nameCString = sel_getName(sel)

        print("\t method named:\(String(cString: nameCString))");
    }

}