Trace Objective-C methods

If you are using Objective-C, you can log trace information on specific methods in your code to measure performance using the following macros:

MINT_METHOD_TRACE_START: Starts the method trace.

MINT_METHOD_TRACE_STOP: Stops the method trace.

MINT_NONARC_METHOD_TRACE_STOP: Stops the method trace. Use this macro if you are not using ARC.

Note  You cannot use this feature with Swift, which does not support macros.

To trace an Objective-C method, add a MINT_METHOD_TRACE_START call to the beginning of your method and a MINT_METHOD_TRACE_STOP call to the end of it, as follows:

// Objective-C
- (void)test {
    MINT_METHOD_TRACE_START
    
    NSLog(@"Hello, World");
    
    MINT_METHOD_TRACE_STOP
}

If you are not using ARC, use the MINT_NONARC_METHOD_TRACE_STOP macro to avoid a memory leak issue.

Then, run a search in Splunk Web on the "mint:methodinvocation" sourcetype to view trace information and performance metrics, for example:

index=mint sourcetype="mint:methodinvocation" | head 5

The trace method automatically picks up performance metrics for your method and sends it to Splunk Enterprise. The following fields contain trace information:

• threadID: The thread ID.
• method: The method that was traced.
• elapsedTime: The elapsed time between starting and stopping the method trace, in nanoseconds.

Here's an example result:

 {
   apiKey: 12345
   appEnvironment: Testing
   appRunningState: Foreground
   appVersionCode: 1
   appVersionName: 1.0
   batteryLevel: -100
   carrier: NA
   connection: WIFI
   currentView: GHUnitIOSViewController
   device: x86_64
   elapsedTime: 52077306
   extraData: {
   }
   locale: US
   method: -[SplunkiOSTests testMethodTrace]
   msFromStart: 1679
   osVersion: 9.2
   packageName: SplunkTests
   platform: iOS
   remoteIP: 204.107.141.240
   screenOrientation: Portrait
   sdkVersion: 5.0.0
   session_id: 83B0BFA2-D224-4EE8-B65F-1A9C6A2A790A
   state: CONNECTED
   threadID: 19207
   transactions: {
   }
   userIdentifier: NA
   uuid: fake_uid
}