Swizzling

The Cocoa SDK uses swizzling to provide some features out of the box without boilerplate code. The following features use swizzling:

macOS

• Breadcrumbs for touch events
• Auto instrumentation for HTTP requests
• Auto instrumentation for File I/O operations
• Auto instrumentation for Core Data operations
• Automatically added sentry-trace header to HTTP requests for distributed tracing
• HTTP Client Errors

iOS, tvOS and Catalyst

• Breadcrumbs for touch events and navigation with UIViewControllers
• Auto instrumentation for UIViewControllers
• Auto instrumentation for HTTP requests
• Auto instrumentation for File I/O operations
• Auto instrumentation for Core Data operations
• Automatically added sentry-trace header to HTTP requests for distributed tracing
• User interaction transactions for UI clicks
• HTTP Client Errors

Since Cocoa 7.5.0, you can opt out of swizzling using options. When you disable swizzling, the SDK disables the features above:

import Sentry

SentrySDK.start { options in
    options.dsn = "https://examplePublicKey@o0.ingest.sentry.io/0"
    options.enableSwizzling = false
}