#import "LSTracer.h"
#import "OTGlobal.h"

- (BOOL)application:(UIApplication *)application
    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    // Initialize the LightStep tracer implementation
    LSTracer* tracer = [[LSTracer alloc] initWithToken:@"{your_access_token}"];
    [OTGlobal initSharedTracer:tracer];

    // <Your normal initialization code here>

    return YES;
}

// Elsewhere:
- (void)someFunction:... {

    id<OTSpan> span = [[OTGlobal sharedTracer] startSpan:@"someFunction:"];

    ...

    [span finish];
}