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 是的，你可以使用NSPointerFunctionsWeakMemory。 Facebook KVOController也使用该选项使用NSHashTable，请参阅KVOController 
 
- (instancetype)init
{
  self = [super init];
  if (nil != self) {
    NSHashTable *infos = [NSHashTable alloc];
#ifdef __IPHONE_OS_VERSION_MIN_REQUIRED
    _infos = [infos initWithOptions:NSPointerFunctionsWeakMemory|NSPointerFunctionsObjectPointerPersonality capacity:0];
#elif defined(__MAC_OS_X_VERSION_MIN_REQUIRED)
    if ([NSHashTable respondsToSelector:@selector(weakObjectsHashTable)]) {
      _infos = [infos initWithOptions:NSPointerFunctionsWeakMemory|NSPointerFunctionsObjectPointerPersonality capacity:0];
    } else {
      // silence deprecated warnings
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
      _infos = [infos initWithOptions:NSPointerFunctionsZeroingWeakMemory|NSPointerFunctionsObjectPointerPersonality capacity:0];
#pragma clang diagnostic pop
    }

#endif
    _lock = OS_SPINLOCK_INIT;
  }
  return self;
}
 
 另外，为了更方便的方式，你可以使用weakObjectsHashTable 
 
 
 
 返回一个新的散列表，用于存储对其内容的弱引用。 
 
 
 返回值使用选项NSHashTableZeroingWeakMemory和NSPointerFunctionsObjectPersonality并具有初始容量为0的新哈希表。 
 
 
 这份文件有点旧，但确实如此。 请参阅NSHipster NSHash表和NSMap表 
 
NSHashTableZeroingWeakMemory: This option has been deprecated. Instead use the NSHashTableWeakMemory option
 
 还请注意 
 
 
 
 NSHashTableWeakMemory等于NSPointerFunctionsWeakMemory 
 

Yes, you can use NSPointerFunctionsWeakMemory. Facebook KVOController also use NSHashTable with that option, see KVOController
 
- (instancetype)init
{
  self = [super init];
  if (nil != self) {
    NSHashTable *infos = [NSHashTable alloc];
#ifdef __IPHONE_OS_VERSION_MIN_REQUIRED
    _infos = [infos initWithOptions:NSPointerFunctionsWeakMemory|NSPointerFunctionsObjectPointerPersonality capacity:0];
#elif defined(__MAC_OS_X_VERSION_MIN_REQUIRED)
    if ([NSHashTable respondsToSelector:@selector(weakObjectsHashTable)]) {
      _infos = [infos initWithOptions:NSPointerFunctionsWeakMemory|NSPointerFunctionsObjectPointerPersonality capacity:0];
    } else {
      // silence deprecated warnings
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
      _infos = [infos initWithOptions:NSPointerFunctionsZeroingWeakMemory|NSPointerFunctionsObjectPointerPersonality capacity:0];
#pragma clang diagnostic pop
    }

#endif
    _lock = OS_SPINLOCK_INIT;
  }
  return self;
}
 
Also, for more convenient way, you can use weakObjectsHashTable
 
 
 
Returns a new hash table for storing weak references to its contents.
 
 
Return Value A new hash table that uses the options NSHashTableZeroingWeakMemory and NSPointerFunctionsObjectPersonality and has an initial capacity of 0.
 
 
The document is a little bit old, but it is true. See NSHipster NSHash​Table & NSMap​Table
 
NSHashTableZeroingWeakMemory: This option has been deprecated. Instead use the NSHashTableWeakMemory option
 
Note also that
 
 
 
NSHashTableWeakMemory Equal to NSPointerFunctionsWeakMemory