Updating UI Manually

Hi,
Is there a way to update UI manually?
For example, I have a function which updates UI and execute some logic.
After the UI update, it will execute some logic that will take a long time and update of UI has to be wait until the execution of logic is finished.
Is there a way to update UI manually befor even the logic is even executed?
It seems that thread can be used in here.
But Is there a way to solve this by not using thread?
Also, using if thread can be used, what is the best practice?
Thanks!

Insert this line between the UI update and the logic.
CFRunLoopRunInMode (CFRunLoopCopyCurrentMode(CFRunLoopGetCurrent()), 0, FALSE);

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