is there any scenario for using KVOControllerNonRetaining?

[sjtupt]

No description provided.

[rjinxx]

[self.KVOController observe:self keyPath:@"date" options:NSKeyValueObservingOptionInitial|NSKeyValueObservingOptionNew action:@selector(updateClockWithDateChange:)];

like this, you observe 'self', if you're not using KVOControllerNonRetaining you'll get retain cycle issue

[sjtupt]

@RylanJIN got it. Thank you.

[djs66256]

KVOControllerNonRetaining is an ambiguous api.

[self.KVOControllerNonRetaining observe:self keyPath:@"date" options:NSKeyValueObservingOptionInitial|NSKeyValueObservingOptionNew action:@selector(updateClockWithDateChange:)];

It will crash. When self dealloc, weak table has already removed the self pointer, so you can not remove observer forever.