ios - beginAnimations with "context"variable in ARC? -

the question partially similar existing ones still error memory management.

the following non-arc code work:

[uiview beginanimations:... context:[[nsnumber numberwithint:i] retain]]; 

and somewhere in didstopselector:

nsnumber * n = (nsnumber *)context; ... [n release]; 

i tried remove retain/release , add copy (and combined these ways) no effect.

additionally saw similar question:

uiview animation on multiple uiimageviews in arc

they pass imagename variable context don't describe if retained or autoreleased.

questions:

1)how convert code arc correctly?

2)is there difference in code if pass retained/autoreleased context (of cousre, if autoreleased work in general)?

try __bridge_retained retain object , cast void*

void *context = (__bridge_retained void *)( @1000 ); 

and in animationdidstop have transfer ownership __bridge_transfer. @ point arc should naturally release object in current autorelease pool.

- (void)animationdidstop:(void *)context {    nsnumber *n = (__bridge_transfer id)context; } 

alternatively can switch block based api , reference views directly.