Find where object is retained with ARC

Question

I have an object that is being retained more than necessary (most likely due to a property that is strong instead of weak). Big codebase, so it\'s

Answer 1

This solution was somewhat helpful for me. It basically uses method swizzling to tricks the ARC compiler into thinking you're not overriding retain and release.

    + (void)load {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
    Class cls = [self class];

    // When swizzling a class method, use the following:
    // Class class = object_getClass((id)self);

    SEL originalSelector1 = NSSelectorFromString(@"retain");
    SEL swizzledSelector1 = NSSelectorFromString(@"myretain");

    SEL originalSelector2 = NSSelectorFromString(@"release");
    SEL swizzledSelector2 = NSSelectorFromString(@"myrelease");

    Method originalMethod1 = class_getInstanceMethod(cls, originalSelector1);
    Method swizzledMethod1 = class_getInstanceMethod(cls, swizzledSelector1);
    Method originalMethod2 = class_getInstanceMethod(cls, originalSelector2);
    Method swizzledMethod2 = class_getInstanceMethod(cls, swizzledSelector2);

    BOOL didAddMethod1 =
    class_addMethod(cls,
                    originalSelector1,
                    method_getImplementation(swizzledMethod1),
                    method_getTypeEncoding(swizzledMethod1));

    if (didAddMethod1) {
        class_replaceMethod(cls,
                            swizzledSelector1,
                            method_getImplementation(originalMethod1),
                            method_getTypeEncoding(originalMethod1));
    } else {
        method_exchangeImplementations(originalMethod1, swizzledMethod1);
    }

    BOOL didAddMethod2 =
    class_addMethod(cls,
                    originalSelector2,
                    method_getImplementation(swizzledMethod2),
                    method_getTypeEncoding(swizzledMethod2));

    if (didAddMethod2) {
        class_replaceMethod(cls,
                            swizzledSelector2,
                            method_getImplementation(originalMethod2),
                            method_getTypeEncoding(originalMethod2));
    } else {
        method_exchangeImplementations(originalMethod2, swizzledMethod2);
    }


});
}

-(id)myretain {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
NSLog(@"tracking retain now %d",(int)[self performSelector:NSSelectorFromString(@"retainCount")]);
SEL selector = NSSelectorFromString(@"myretain");
return [self performSelector:selector withObject:nil];
#pragma clang diagnostic pop
}

-(id)myrelease {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
NSLog(@"tracking release now %d",(int)[self performSelector:NSSelectorFromString(@"retainCount")]);

SEL selector = NSSelectorFromString(@"myrelease");
return [self performSelector:selector withObject:nil];
#pragma clang diagnostic pop

}