How to remove UIView objects from screen? (WAX)

ljp1203 · January 2013

Hi everyone!

I need some help with wax. I cant seem to find out how to remove a UIView object such as a datPicker for example from the screen. I've tried removeChild, removeFromParent. But I can't seem to figure out how to take it off the screen.

Help would be appreciated.

Thanks!
-Landon

OZApps · January 2013

@Landon, UIKit objects are not Gideros Display objects and cannot be removed the same way as the Gideros Display objects.

You need to remove the object from the superview.

[datPicker removeFromSuperview];

which will translate to

datPicker:removeFromSuperview()

you have skipped your reading the iOS manual/book

If you can, spend and buy the iOS tutorials from Ray Wanderlich, it is a good compilation and if you wnt to learn step-by-step then there are other books that take you slow.

If you want to learn about pure Lua for iOS, there is also my book ( http://www.apress.com/9781430246626 )

A little reading will definitely help.

OZApps · January 2013

Update: You can read this one http://bit.ly/ZzbmN1 it is the UIView Documentation

ljp1203 · January 2013

@OZApps

I tried what you just showed me, but it didn't work it keeps giving me an error.

SCREENS/Party.lua:12: attempt to index global 'datePicker' (a nil value)
stack traceback:
SCREENS/Party.lua:12: in function

Here is my code:

Party = Core.class(Sprite)
function Party:init()
 
	--Create Event PlanitBtn	
	local backBtn = Bitmap.new(Texture.new("Images/backbtn.png"))
	local backBtn_over = Bitmap.new(Texture.new("Images/backbtn_over.png"))
 
	--The Actual PlanitBtn and Listener
	local backbtn = PlanitBtn.new(backBtn, backBtn_over)
	backbtn:addEventListener("click",
		function()
			datePicker:removeFromSuperview()
		end)		
 
	--Add PlanitBtn To Scene
	backbtn:setPosition(35,70)
	self:addChild(backbtn)
	---------------------------------------------------------------------------------------------------------------
	--Sign Up PlanitBtn	
	local signupBtn = Bitmap.new(Texture.new("Images/signupbtn.png"))
	local signupBtn_over = Bitmap.new(Texture.new("Images/signupbtn_over.png"))
 
	--The Actual PlanitBtn and Listener
	local button2 = PlanitBtn.new(signupBtn, signupBtn_over)
	button2:addEventListener("click",
		function()
			local datePicker = UIDatePicker:init()
			getRootViewController():view():addSubview(datePicker)
			local dateFrame = BhUIViewFrame.new(datePicker, CGRect(0,264,0,0))
			self:addChild(dateFrame)
		end)
 
	--Add PlanitBtn To Scene
	button2:setPosition(320, 370)
	self:addChild(button2)
 
 
 
end

I have all the files necessary for Wax. Hopefully you can help with this

Thanks.
-Landon

OZApps · January 2013

Is datePicker available ? is it a global variable that can be accessed by this lua file/module?

In all of your previous dicussion you have called it datPicker and now you are calling it datePicker.

ljp1203 · January 2013

@OZApps

I ment to say datePicker if I spelt it wrong. And what do you mean by being available?
Does it have to be in it's own lua file?

Thanks

OZApps · January 2013

by available I mean can it be accessed from another lua file? The scope, is it Global, because if you have

-- file1.lua
local myvar
myvar = "show me"

-- file2.lua
print(myvar)

it will print nil as myvar is not accessable from file2, so either make it global by removing the local before the myvar or pass it as a parameter to file2 and save it somewhere in that scope.

ljp1203 · January 2013

@OZApps

Thanks for telling me that. I removed local in front of it, and it worked. Thanks.

Also, you may have answered this before for me, but I want to close the keyboard by clicking done on the keyboard when a UITextField is invoked. I found this code:

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[textField resignFirstResponder];
return NO;
}

But when I try to convert it into LUA, it gives me all sorts of errors. How would I convert this type of code?

Thanks.

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