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In the actual application development process, the user experience of synchronous requests is not very good; we all know that. Apple attaches great importance to the user experience. This also became the benchmark of the industry, no real users where the good products. So the user experience is extremely important. There seems to be a lot of crap. Then get to the point. Synchronization request is not good. Then use the method of the asynchronous request. In development, asynchronous requests us

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]; Dispatch_group_leave (_group); }Else{nserror*error = [Nserror errorwithdomain:@"COM.FDZX"code:-1userinfo:@{}]; [Task Updateerror:error]; Dispatch_group_leave (_group); }} Option:option]; Dispatch_group_notify (_group, Dispatch_get_main_queue (),^{_completionhandler (_tasks); }); Four. Easy to downloadDownload voucher document According to seven KNThe download uses the Get methodGet URL generation method look at the document on the l

-h host Address-u user name-P user PasswordV. Perform common MySQL database operationsNote: The following actions are sent now, after connecting to the database, enter the MySQL environment, then execute the command must have a semicolon ";"First, connect to MySQL with root privilegesMysql-u root-pThen, enter the root password1. Add new usersThe format is as follows:Grant operation permissions on the database. * To username @ Login host address identified by ' password ';Grant, a user on a host