Help/Support MSHooking Symbols help

[B3albakii 165 iPhone X 12.4]

Hey

i am trying to learn ida .. 

the game is Pou i know i can hack it with flex but as i said wanna learn ida

text:000000010003D630 ; ShopItem - (int)coins
__text:000000010003D630
__text:000000010003D630 ; int __cdecl -[ShopItem coins](struct ShopItem *self, SEL)
__text:000000010003D630 __ShopItem_coins_                       ; DATA XREF: __objc_const:0000000100534180o
__text:000000010003D630                 ADRP            X8, #_OBJC_IVAR_$_ShopItem.coins@PAGE ; int coins;
__text:000000010003D634                 LDRSW           X8, [X8,#_OBJC_IVAR_$_ShopItem.coins@PAGEOFF] ; int coins;
__text:000000010003D638                 LDR             W0, [X0,X8]
__text:000000010003D63C                 RET
__text:000000010003D63C ; End of function -[ShopItem coins]

and this is my  tweak.x 

 

#include <substrate.h>

int Money()
{
return 9999;
}

%ctor{
MSHookFunction(((void*)MSFindSymbol(NULL, "__ShopItem_coins_")),(void*)Money, NULL);
}

 i can compile this but nothing happen in the game ... 

any help please