Make a loading in after effect

in this tutorial we will make a loading effect only using
shape layer
little after effect expression
slider control effect 

only 3

first time is make  a white line to make background line

Second line .. make a blue line, it's the loading line



Third On that blue line add effect slider control in after effect
Effect --> Expression Control ---> Slider Control

Fourth open the blue line properties and add some expression

Or just copy paste it
alt + click in stopwatch of size add
[effect("Slider Control")("Slider")*10,80];

alt + click in stopwatch of  position add
[-500+effect("Slider Control")("Slider")*5,0];


NOW  Move your slider control.

You can see that loading effect in after effect to add the number text here we are

first make text
open source text
alt + click in source text add
thisComp.layer("blue line").effect("Slider Control")("Slider")

but set your blue line layer name it to blue line
and it will works

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