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i not sure about convert project to Automatic Reference Counting(ARC). it still support on iOS 4.X or lower ?
thank you
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Swift uses Automatic Reference Counting (ARC) to track and manage your app's memory usage. In most cases, this means that memory management “just works” in Swift, and you don't need to think about memory management yourself.
Automatic Reference Counting manages object life cycles by keeping track of all valid references to an object with an internal retain count. Once all references to an object go out of scope or are cleared, and the retain count thus reaches zero, the object and its underlying memory is automatically freed.
You can disable ARC for a specific class using the -fno-objc-arc compiler flag for that class. In Xcode, in the target Build Phases tab, open the Compile Sources group to reveal the source file list. Double-click the file for which you want to set the flag, enter -fno-objc-arc in the pop-up panel, then click Done.
In Swift, memory management is handled by Automatic Reference Counting (ARC). Whenever you create a new instance of a class ARC allocates a chunk of memory to store information about the type of instance and values of stored properties of that instance.
From what I can gather yes - ARC is done by the compiler and should be thought of as a wizard or helper that checks all of your code and inserts the correct retain and release statements for you.
This will therefore be compatible with older iOS runtimes.
Edit:
IT will support 4.x but not 3.x
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