ios - Override init method to have singleton instance -

one third party library uses class initialisation:

classa *a = [[myclass alloc] init]]; 

i need myclass shared instance (aka singleton) can't modify 3rd party way of executing myclass initialization

i trying override init method following:

- (instancetype)init {     return [[self class] sharedinstance]; }  + (loopmenativeevent *)sharedinstance {     static loopmenativeevent *_sharedinstance = nil;     static dispatch_once_t oncetoken;     dispatch_once(&oncetoken, ^{         _sharedinstance = [loopmenativeevent new];     });     return _sharedinstance; } 

but, unfortunately new causes alloc init executed.

simplest way know have 2 separate classes:

• myclass initialised through alloc init
• separate mysharedclass singleton

is there possibility achieve having 1 class?

how inheritance,

create new class named childclass inherit myclass , add following 2 methods

+ (instancetype)sharedinstance {     static childclass *sharedinstance = nil;     static dispatch_once_t oncetoken;     dispatch_once(&oncetoken, ^{        sharedinstance = [[childclass alloc] init];     });      return sharedinstance; }  - (id)init {     self = [super init];     return self;  }