Typically this happens when observers are retained in memory when they should have been deallocated. In addition, memory leaks can introduce side effects in your app. As you can see, memory leaks can be very problematic if a substantial leak occurs because after using your app for a period of time, the app would crash. If that memory warning is not handled, your app would be force-killed, which is an OOM (Out of memory) crash. Memory leaks increase the memory footprint incrementally in your app, and when it reaches a certain threshold the operating system (iOS) this triggers a memory warning. As a result these objects retain each other in memory because their retain count would never decrement to 0, which would prevent deinit from ever being called and memory from being freed. Since Swift uses Automatic Reference Counting (ARC), a retain cycle occurs when two or more objects hold strong references to each other. What are retain cycles and memory leaks?Ī memory leak in iOS is when an amount of allocated space in memory cannot be deallocated due to retain cycles. If pinpointing root causes of problematic memory is interesting to you, check out our new blog post Examining Problematic Memory in C/C++ Applications with BPF, perf, and Memcheck for a detailed explanation of how memory works. After significantly increasing our OOM-free session rate on our Dasher iOS app, we would like to share some tips on avoiding and fixing retain cycles as well as a quick introduction using Xcode’s memory graph debugger for those who are not familiar. In order to detect and fix these issues, we have found the Memory Graph Debugger to be quick and easy to use. A major part of this effort is to prevent, fix and remove any retain cycles and memory leaks in our large codebase. At DoorDash we are consistently making an effort to increase our user experience by increasing our app's stability.
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