To write and compile source code for ARC, you have to take care of a few things. Just by following the rules in the list below, you can write source code for an ARC-enabled environment with confidence.
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Forget about using retain, release, retainCount, and autorelease.
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Forget about using NSAllocateObject and NSDeallocateObject.
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Follow the naming rule for methods related to object creation.
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Forget about calling dealloc explicitly.
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Use @autoreleasepool instead of NSAutoreleasePool.
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Forget about using Zone (NSZone).
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Object type variables can’t be members of struct or union in C language.
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‘id’ and ‘void*’ have to be cast explicitly.
As described previously, the compiler doesn’t manage variables with the __unsafe_unretained ownership qualifier. You have to take care of ownership yourself to avoid a memory leak or the application will crash.
Conversely, __bridge_transfer cast will release the object just after the assignment is
