Label and Button Text does not update during a do loop

[Greg Marsh]

During the do loop test program shown below the the text Label1 and Button1 does not change until beat 6 is done, and then 6.0 and here2 is displayed. I tried both emulator and downloading the program to the phone. Is there a way to get button or label text to update during a do loop?

[Taifun]

use a clock component instead of a for each loop

also, why do you need the while loop? see also

Why is a wait procedure generally a bad idea?

Taifun

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Trying to push the limits of App Inventor! Snippets and Tutorials from Pura Vida Apps by Taifun.         

[Greg Marsh]

Previously did a metronome app with a clock timer component that worked pretty good, but was trying to eliminate timer variations with a while loop using the clock duration function. Actually this does seem to eliminate time variations, but labels are not updating. - Greg

[Taifun]

It would really help if you provided a screenshot of your relevant blocks, so we can see what you are trying to do, and where the problem may be.

[Greg Marsh]

Here is a partial screenshot of the 98% working metronome app - when set to say 100 bpm it is accurate plus or minus 2 bpm. Just a timer call that displays a label and plays sounds. I'm thinking about trying to run the Timer a little fast and then having a clock duration call to wait to the exact time. - Greg M 

[Taifun]

the last screenshot does not help to find a solution for your problem...

as already said, if you want the label to update, use a clock component instead a for each loop and a counter variable wich increments after each run of the timer event, if you want to see the label updating, try some different timer intervals, e.g. 10 milliseconds

Taifun

[Taifun]

here is a quick example

Taifun

[Taifun]

see attached project

Taifun

[Greg Marsh]

Got it working, replaced 1st do loop with a timer set for 30ms, in the timer have empty do until clock duration timer start - now < beat interval * beat count, and after that have the play the metronome sound. No drift off time.