I want to make an animal farm in Minecraft – Pocket Edition, but I cant seem to catch them. Is there a good way to catch them or make them spawn in a specific area?
If you have 0.5.0 Alpha, then there is absolutely no way to do it except by pushing it into the farm. It is also pretty useless because you can't breed the animals. You can just move to an area where there is lots of animals. But if you have 0.8.0 alpha then you can use wheat to make them follow :)
Grow wheat! To grow wheat: take a hoe and tap a grassy block some times. A thing of seeds will pop up. Collect those, take the hoe wherever, and tap it. Once you have done all of that, just plant the seeds, wait a few days, collect the wheat by tapping and holding the finished crop (yellowish with a brown top), then collect the wheat along with more seeds. Pull the wheat out and show it to an animal. It should follow you! This only can be done on 0.8.0 update, and when you get the update you can grow carrots so pigs can follow you. This is what each animal can be lured by.
Chickens: wheat seeds
Pigs: carrots and potatoes