Debugging

2023.01 A Better Way To Test Reference Cycles in iOS create a weak reference to the object you want to test and make sure it is nil in the test’s tearDown.
2022.12 Securely debugging your app in production
2022.10 Add name for debugging A really useful trick when debugging is to subclass the thing you are interested in just to make it easier to search for inside the various debugging tools.
2019.08 Advanced lldb tricks for Swift - Injecting and changing code on the fly
2019.07 Reducing Memory Footprint and OOM Terminations in iOS
2019.07 iOS — Advanced Memory Debugging to the Masses explains pages, dirty&clean memory, as well as how the VMMap command-line tool works.
2019.04 iOS Debugging Tips & Tricks Provides examples of watchpoints and symbolic breakpoints
2019.01 👍 Debugging iOS network traffic using mitmproxy (for apps that do not use certificate pinning)
2018.10 Xcode and LLDB Advanced Debugging Tutorial: Part 2 Watchpoints & Symbolic breakpoints briefly explained
2017.12 UIDebuggingInformationOverlay is a private UIWindow subclass created by Apple, presumably to help developers and designers debug Apple’s own iOS apps.
2017.09 Debugging Swift code with LLDB
2017.08 Useful Xcode breakpoint: When you dismiss a controller and you don’t hear the pop sound (or see the log), you probably have a retain cycle.
2017.06 DeallocationChecker Tool by Arek Holko
2017.06 Catching Leaky View Controllers Without Instruments
2017.03 System Level Breakpoints in Swift
2016.08 Easy Optimization Wins
2011.01 How debuggers work (three parts, not iOS specific)

Logging

2019.04 Migrating to Unified Logging: Console and Instruments
2018.09 Migrating to Unified Logging, Swift Edition
XCGLogger allows you to log details to the console (and optionally a file, or other custom destinations), just like you would have with NSLog() or print(), but with additional information, such as the date, function name, filename and line number.
NSLogger is a high performance logging utility which displays traces emitted by client applications running on macOS, iOS and Android. It replaces traditional console logging traces (NSLog(), Java Log).