问题
I use MFMailComposeViewController in an app I'm working on now. When user taps on a button, email form pops up.
Now when I use instruments to monitor memory during this process I see that every time you push the cancel button and the action sheet appears, about 2.5 mb of memory adds up to live bytes in all heap & anonymous vm. This only occurs if you tap the cancel button, everything runs normally when you send the email.
Btw I checked Apple's MessageComposer sample code here , it has the same issue.
Does anyone know what might be the reason?
回答1:
Sounds like a memory leak in the API (UIKit) - they are rare but they certainly do occur, I remember reporting one back in SDK 4.0 which occured when running the standard 'Masterview Controller' template.
来源：https://stackoverflow.com/questions/19708510/cancelling-mfmailcomposeviewcontroller-causes-a-memory-leak