【ugui】《How to know the Button phase？》

When I press the Button.It just execute "onclick" event。
but I don't know whether it start press or on pressdown?

 

There are many examples on this forum regarding this.
Either

• write a script implementing the IPointerDown events
• Use the sample UI button in the UI Extensions bitbucket repo https://bitbucket.org/ddreaper/unity-ui-extensions
• Lastly, use the EventTrigger component (not advised)