从Objective-C块创建IMP

// 定义一个 C 函数，接收一个 Objective-C 对象和消息，然后调用相应的 IMP
void invoke_imp(id receiver, SEL _cmd, ...) {
    va_list args;
    va_start(args, _cmd);

    id arg = va_arg(args, id);
    while (arg != nil) {
        [receiver performSelector:NSSelectIndexWithObjCType:arg];
        arg = va_arg(args, id);
    }

    va_end(args);
}

// 创建 IMP 示例
IMP my_imp = ^(NSArray *args) {
    NSLog(@"Received message: %@", args);
};

// 创建一个对象，并将 IMP 绑定到对象
id my_object = [[NSObject alloc] init];
objc_setAssociatedObject(my_object, @"my_imp", my_imp, OBJC_ASSOCIATION_RETAIN_NONATOMIC);

// 调用对象的方法，实际上会调用 IMP
[my_object myMethodWithArgs:@"hello" arg2:42];

// 定义一个 C 函数，接收一个 Objective-C 对象和消息，然后调用相应的 IMP
void invoke_imp(id receiver, SEL _cmd, ...) {
    va_list args;
    va_start(args, _cmd);

    id arg = va_arg(args, id);
    while (arg != nil) {
        [receiver performSelector:NSSelectIndexWithObjCType:arg];
        arg = va_arg(args, id);
    }

    va_end(args);
}

// 创建 IMP 示例
IMP my_imp = ^(NSArray *args) {
    NSLog(@"Received message: %@", args);
};

// 创建一个对象，并将 IMP 绑定到对象
id my_object = [[NSObject alloc] init];
objc_setAssociatedObject(my_object, @"my_imp", my_imp, OBJC_ASSOCIATION_RETAIN_NONATOMIC);

// 调用对象的方法，实际上会调用 IMP
[my_object myMethodWithArgs:@"hello" arg2:42];