Reference old memory Error--free conversion ARC,MRC

You can start with the arc (Automatic Reference counting: Auto reference count) instead of the previous MRC (Manual Reference Counting: Manual reference count). Using arc will reduce the amount of code and the frustration of forgetting to release objects. But there are two sides to everything. After using arc, if you want to reuse the previously written use of the MRC class, you will get an error, just do one of the following steps to solve:

1, under the Targets build phases option under Compile sources select the file you want to use ARC to compile, double-click it, enter-FNO-OBJC-ARC
　　

The Arc class can also be used in MRC projects. Here's how:


2, under the Targets build phases option under Compile sources select the file to be compiled with arc, double-click it, enter-FOBJC-ARC

Reference old memory Error--free conversion ARC,MRC