sendMessage:], as shown in figure 10-69.
Figure 10- 69 [CKTranscriptController sendMessage:]
Another method full of branches. But after giving a glimpse to the possible execution flows
just like what we did to sendComposition:, we can find that most branches are just making
preparations, only “_startCreatingNewMessageForSending:” looks promising. Let’s take a look
at its implementation, as shown in figure 10-70.