iOS - Memory Management

Must follow:

1. For every alloc, retain, copy you should have a release as soon as you are going to leave it
2. Avoid using autoreleased objects, You can use autorelease objects but keep in mind that they will not be released until their pool is released
3. Always respond to memory warnings and take them seriously 
4. Stick to Lazy Loading, means defer initialization of an object until the point at which it is necessity.
5. Don't release the objects that we don't own.
6. Reuse your objects instead of declaring new ones, in possible scenarios.
7. If you are not using same resource repeatedly then avoid methods like [UIImage imageNamed:@""] because these method will increase cache size, a better alternate is [UIImage imageWithContentsOfFile:@""]
8. Build custom UITableCell, UICollectionViewCell etc; and reuse them properly
9. Override setters properly
10. Use initWithCapacity when size is known to you
11. Use delegates carefully, remember to set delegate properties to nil before releasing its owner; otherwise, the object might think that its delegate is still there, and will send a message to an invalid pointer.
12. Use LLVM/Clang Static Analyser tool. It will catch errors regarding the Objective-C naming conventions and hidden memory leaks when using foundation frameworks

Good to have:

1. Enable Guard Malloc
2. Enable NSAutoreleaseFreedObjectCheckEnabled
3. Enable NSZombieEnabled
4. Enable NSDebugEnabled