Pythonista Countdown on button with .pyui

[JeremyMH]

How do I make a timer start to countdown with the click of a button? Here is an image of what I have so far. Im trying to make it so when you click "Launch", the timer starts. Can anyone help me? Thanks

[mikael]

@JeremyMH, if you have created this in the UI editor, now you have to move to the code.

You need to set the button’s action be a function that updates the timer and, if the timer should still be running, calls itself after a second with ui.delay.

[JeremyMH]

sorry im kind of a noob. can you please explain further! thanks

[JeremyMH]

like for example, how would i make it call the function and how woukd i change the value of the ui? i havent used python in a while.

[ccc]

@JeremyMH Can you please paste here the code that you have so far?

It is easier to debug Python code than it is to debug English prose.

[mikael]

@JeremyMH, let’s check the basics first.

• Have you read the basic usage page?
• Have you checked this section of the ui module manual and tried the example of tying a button to an action?

[JeremyMH]

import ui

def startlaunch(countdown):
	viewvalue = countdown.superview
	tapped = viewvalue['launchbutton']
	started = False
	if tapped:
		started = True
	while tapped: 
		ui.delay(countdowntick, 1)
	
def countdowntick():
	print("hi")

v = ui.load_view()
v.present('sheet')

but that just crashes it

[mikael]

@JeremyMH, it looks to me that your code should do nothing, not even give an error.

Did you try the code in my second link above?

[enceladus]

Look at the stopwatch1.py and stopwatch1.pyui example in the following GitHub repository. May be this is what you are looking for.
https://github.com/encela95dus/ios_pythonista_examples

[BapeHiks]

@JeremyMH a foundation vote that proposed @enceladus but without the editor UI

import ui
class StopWatch(ui.View):
	def __init__(self, *args, **kwargs):
		super().__init__(*args, **kwargs)
		self.value = 0
		self.state = 'stop'
		self.update_interval = .1

	def draw(self):
		t0 = (self.value // (600 * 60), self.value // 600, self.value // 10)
		t1 = (t0[0], t0[1] % 60, t0[2] % 60)
		ui.draw_string(
			"{:02}:{:02}:{:02}".format(*t1),
			font=('Helvetica', 20),
			rect=(150, 0, 0, 0),
			color='black',
			alignment=ui.ALIGN_CENTER)

	def update(self):
		if self.state == 'run':
			self.value += 1
		self.set_needs_display()


def button_action(sender):
	v1 = sender.superview['Watch']
	sender.hidden = True
	if sender.title == 'Reset':
		v1.value = 0
		v1.state = 'stop'
		sender.superview['Start'].hidden = False
	elif sender.title == 'Start':
		v1.value = 0
		v1.state = 'run'
		sender.superview['Stop'].hidden = False
	elif sender.title == 'Stop':
		v1.state = 'stop'
		sender.superview['Reset'].hidden = False
		
v = ui.View(width=397, height=271)

v.add_subview(StopWatch(name = 'Watch', frame = (0, 30, 345.00, 76.00)))
v.present('sheet')

for btn in ['Reset', 'Stop', 'Start']:
	v.add_subview(ui.Button(frame=(v.center.x-40, v.center.y-40, 80, 80), name=btn, border_width=1, corner_radius=40, action=button_action))
	v[btn].title = btn
	if btn != 'Start':
		v[btn].hidden = True```