sample2.mm

#import <Foundation/Foundation.h>
#import <CoreFoundation/CoreFoundation.h>
#import <objc/runtime.h>
#import <UIKit/UIKit.h>
#import <substrate.h>

@class UIKeyboardLayoutStar;

static BOOL replaced_UIKeyboardLayoutStar_shouldShowDictationKey(UIKeyboardLayoutStar *self, SEL _cmd) {
    // can be able to call original method.
    NSLog(@"original return BOOL value = %@", [self PREFIX_shouldShowDictationKey] ? @"YES" : @"NO");
    return NO;
}

__attribute__((constructor))
static void OverrideMethodFunction() {
    MSHookMessage([UIKeyboardLayoutStar class],
                  @selector(shouldShowDictationKey),
                  (IMP)&replaced_UIKeyboardLayoutStar_shouldShowDictationKey,
                  "PREFIX_");
}