Running simultaneous operations in Mailcore2

问题

Is it possible to run multiple operations simultaneously? I'm downloading emails in the background through an operation. When my users open an email to view it I start another operation to get the message - this doesn't run until the downloading operations are complete.

回答1:

You can adjust the property allowsFolderConcurrentAccessEnabled if you think you're always be on a server that supports it. Additionally, when you fetch a message, you can use a urgent flag to tell if you need to fetch it as soon as possible. It will make operation run simultaneously.

- (MCOIMAPFetchContentOperation *) fetchMessageOperationWithFolder:(NSString *)folder
                                                               uid:(uint32_t)uid
                                                            urgent:(BOOL)urgent;

来源：https://stackoverflow.com/questions/27904639/running-simultaneous-operations-in-mailcore2