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下面是模拟IDLPainterDeveloper继承IDLDeveloper以及IDLPainter的例子，直接上代码吧：

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface IDLDeveloper : NSObject

- (void)coding;

@end

NS_ASSUME_NONNULL_END
#import "IDLDeveloper.h"

@implementation IDLDeveloper

- (void)coding {
    NSLog(@"I Can coding!");
}

@end
#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface IDLPainter : NSObject

- (void)drawing;

@end

NS_ASSUME_NONNULL_END
#import "IDLPainter.h"

@implementation IDLPainter

- (void)drawing {
    NSLog(@"I Can Drawing!");
}

@end
NS_ASSUME_NONNULL_BEGIN

@interface IDLPainterDeveloper : NSProxy

+ (instancetype)createPerson;

@end

NS_ASSUME_NONNULL_END
#import "IDLPainterDeveloper.h"

//super
#import "IDLPainter.h"
#import "IDLDeveloper.h"

@interface IDLPainterDeveloper ()

@property(nonatomic, strong, readwrite) NSMutableDictionary *methodDictionary;

@end

@implementation IDLPainterDeveloper

+ (instancetype)createPerson {
    return [[IDLPainterDeveloper alloc] init];
}

- (instancetype)init {
    
    IDLPainter   *painter   = [[IDLPainter alloc] init];
    IDLDeveloper *developer = [[IDLDeveloper alloc] init];
    
    [self inheriteMethodsFromSuperTarget:painter];
    [self inheriteMethodsFromSuperTarget:developer];
    return self;
}

- (void)inheriteMethodsFromSuperTarget:(id)target{
    if(!target) return;
    unsigned int numberOfMethods = 0;
    Method *methodList = class_copyMethodList([target class], &numberOfMethods);
    for (int i = 0; i < numberOfMethods; i++) {
        SEL sel = method_getName(methodList[i]);
        const char *methodName = sel_getName(sel);
        [self.methodDictionary setObject:target forKey:[NSString stringWithUTF8String:methodName]];
    }
    free(methodList);
}

- (void)forwardInvocation:(NSInvocation *)invocation{
    SEL sel = invocation.selector;
    NSString *methodName = NSStringFromSelector(sel);
    
    id target = self.methodDictionary[methodName];
    
    if (target && [target respondsToSelector:sel]) {
        [invocation invokeWithTarget:target];
    } else {
        [super forwardInvocation:invocation];
    }
}

- (NSMethodSignature *)methodSignatureForSelector:(SEL)sel{
    NSString *methodName = NSStringFromSelector(sel);
    id target = self.methodDictionary[methodName];
    if (target && [target respondsToSelector:sel]) {
        return [target methodSignatureForSelector:sel];
    } else {
        return [super methodSignatureForSelector:sel];
    }
}

- (NSMutableDictionary *)methodDictionary {
    if(!_methodDictionary) {
        _methodDictionary = [[NSMutableDictionary alloc] init];
    }
    return _methodDictionary;
}

@end
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