如何在iOS Swift中的时间间隔上发送HTTP GET请求？

Question

How do you continuously send HTTP GET requests on a time interval (every x/seconds)?

Currently I have a getMessages() function in my viewDidLoad() so that it will send a GET request on view load and populate a table view with the results from the server.

Answer 1

Just use the NSTimer method scheduledTimerWithTimeInterval . You can say that it should repeat the timer and which method should get invoked if the time is over:

NSTimer.scheduledTimerWithTimeInterval(timeInSeconds, target: self, selector: "getMessages", userInfo: nil, repeats: true)

Answer 2

对于swift3，请使用Timer，有关详细信息，请参考间隔发送此http请求 。

Timer.scheduledTimer(timeInterval: 3, target: self, selector: #selector(getMessage), userInfo: nil, repeats: true)