Add SwiftUI debugger blog #188
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trevor-e
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Jan 9, 2026
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mtopo27
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| | [_UIKit automatic tracing_](https://docs.sentry.io/platforms/apple/guides/ios/tracing/instrumentation/automatic-instrumentation/#uiviewcontroller-tracing) | | ||
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| This works using Objective-C swizzling, replacing the instance methods with stubs that add logging and then call the original method. This mechanism is possible because the Objective-C runtime uses selectors to identify methods and call them through `objc_msgSend()`. It would be very useful if we could do something similar for SwiftUI. For example, our [snapshot test framework](https://github.com/EmergeTools/SnapshotPreviews) (from my work at Emerge Tools, now part of Sentry) could report the slowest views. However, Swift does not need to use this mechanism. Swift function calls can even be optimized away entirely by the compiler through inlining, so we can't use swizzling to hook a pure Swift function. |
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"could report the slowest views" - feels a bit off to just say this w/ no links out (don't think we ever publicized this). If there's nothing to link to, we can leave it at that, but if you do have something would be nice to have
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To be clear that is not something we do, it's just something we could do with this framework. So I don't think there is a link for it
trevor-e
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Jan 20, 2026
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