A previous report complaining about the much reduced farming area was closed as cannot be reproduced except that it is easily reproduced and still valid. The wiki states that the village radius is a minimum of 32 blocks. It also states that a farmer will farm a 31x3x31 (x,y,z) area. However, no villagers will go outside a 16 block radius and neither will a farmer farm beyond that - if anywhere near a village. A farmer will farm anywhere if not. So, either the rules have changed and wiki is wrong or there have been added restrictions for iOS users or the fix to stop the villagers wandering too far have been restricted too much. As the villagers are restricted in movement then it is almost impossible to build a large village and the villagers will huddled near the centre.