ios - 谁能说说CGImageRelease和 CGImageRetain的区别？

Question

如题。

比如我创建一个CGImageRef。用完了我要释放，免得内存升高，我应该用哪个？

CGImageRef imageRef = [asset.defaultRepresentation fullScreenImage];

Answer 1

release is counter -1,, retain is +1
Need it when you don’t need itrelease

Answer 2

1) First check whether you have called CGImageRelease, CGImageCreate or CGImageCreateCopy before using CGImageRetain. .
2) If not, it will crash. . .
For asset classes, actively adjusting this does not seem to be useful in reducing memory usage. . .

Answer 3

Although there is ARC now, you still need to understand MRC

Answer 4

If you need to release memory, of course call CGImageRelease. CGImageRelease sets the reference count to -1. When the reference count reaches 0, the system will release and reclaim the memory. The counterpart to this is retain +1. Although ARC is used more now, the author still needs to understand and learn about memory management.