IOS development, how to mix arc and non-arc in engineering

In the Xcode project we can use both arc and non-arc blending modes.
If your project uses a non-arc mode, add the-FOBJC-ARC tag to the ARC mode code file.
If your project is using ARC mode, add the-FNO-OBJC-ARC tag to the non-ARC mode code file.
Ways to add Tags:
Open: Your target, Build phases-Compile Sources.
Double-click the corresponding *.m file that you want to convert
In the pop-up window, enter the label mentioned above-FOBJC-ARC/-fno-objc-arc
Click Done to save it.

IOS development, how to mix arc and non-arc in engineering