I have an application cocos2d. I want my image is displayed once. Not every time I go in cocos2d view.Do you have any idea?
Just use a global flag for this. Create a bool variable globally and set it False after display image. And check this variable each time entering that view. If it is false you can remove that image from view or set it's opacity to zero if you want to display that image in any other cases.
this ques is not explicitly related to cocos2d though.
Steps:
1. When you need to display ur image, check for a bool value existence in NSUserDefaults.
2. If value does not exists (or return value is FALSE), means you can display your image.
3. After displaying image, set TRUE value in NSUserDefaults for that specific key.
Done..!!
Related
Currently the "value" property of Slider is required, however I was wondering if it is possible to create a Slider such that it initially has no value and the thumb is hidden. Then when the user presses along the line, the thumb appears at that point.
I looked at https://pub.dev/packages/flutter_xlider but it seems like that package also required values to be set.
I think not, and for good reason. The function of the Slider and the understanding of how it is used is interpreted by the user primarily based on seeing the thumb indicator on a line. So regardless how you set up the requirements for the slider's usage in your app, the Slider control needs to always have a value represented. You could default the slider value to the min, the max, the middle(-ish), or any valid value.
If you want to ensure the user makes a selection (making it a required field sort of), you could set a bool state variable on an ancestor widget (perhaps named sliderWasTouched) to true when any part of the Slider is tapped and whenever the Slider changes value (after initialization), and then make that state variable being true part of your form field validation.
How can I create an interaction between a Slider and a Edit Field (Numeric) in Matlab App desginer? That if I change one the other one is also changing. Any idea? and example that I can learn from?
Quite simple, suppose u have slider called sliceSelect and (in my case spinner) called sliceSelectNumber
if u change value using slider, u can change spinner value like this:
app.sliceSelectNumber.Value = app.sliceSelect.Value;
if u want to change minor ticks in slider depending on input in spinner, u can do it like that:
app.sliceSelect.Value = app.sliceSelect.MinorTicks(app.sliceSelectNumber);
I hope this helped u a little bit, although this question is old :D
for more info see: https://uk.mathworks.com/help/matlab/creating_guis/write-callbacks-for-gui-in-app-designer.html
I'm trying to build a canvas app with color picker using jscolor.
Here are what I've done:
Included the file jscolor.js
Created a button with class="jscolor"
Code for the button:
<button id="strokeCol" class="jscolor {valueElement:'color_value'}" onchange="config.changeStrokeCol(this.jscolor)">
Stroke Color
</button>
When I select a color from the picker I can see the background color of the button changing in developer tool, but in RGB value. Read it somewhere else that I can simply get the HEX by specifying $('element').val(), but in my case it just gives me "" (blank).
The HTML also has no value attribute triggered by the click, not to say being updated. The examples only shows that I can specify a default value (which can't be updated as well).
Have I missed anything? Or has jscolor been updated to provide only RGB value through the background color?
The only workaround I can think of is allowing the HEX code to be displayed inside the button then use .html() to get the value, but it seems so unnecessary.
Problem solved when class is inserted to the
<input> tag. Strange!
I was just experimenting with layer property of my UIButton by setting a outlet n the code for a button created in xib.
NSLog(#"d button layer value%#",dButton.layer.backgroundColor);
But the output is coming as:
d button layer value(null)
My question is: can't we display the layer property value of UIButton. We all know that some default value would have been set for the button.
According to the documentation for CALayer:
The default is nil.
unless you explicitly change it.
In the documentation for UIView, it says this:
The default value is nil, which results in a transparent background color.
This excerpt describes the view.backgroundColor property, so I assume that the view.layer.backgroundColor property is the same.
Hope this helps!
Phew !! I finally got the answer.
Actually I was trying to display the structure value using %# in NSlog statement.
dButton.layer.backgroundColor is a fundamental data type used internally by Quartz to represent colors.
So, way to display them is to make your own class which can parse the value.
Like, for example there are class functions for CGRect, CGPoint etc
like for displaying CGRect we use this code
NSLog(#"d button layer value%#",NSStringFromCGRect(dButton.layer.bounds));
but there arent any function defined for CGColorRef.
Ok, as per jrturton said,for displaying the above value we can use
NSLog(#"d button layer value%#",[UIColor colorWithCGColor:button.layer.backgroundColor)]
I hope everyone got it now !!
I have multiple scenes in my iphone game. In one of the scene which is the SelectLevelMenu scene I have shown the level number in a CCLabelTTF. Now I want to use this value in my StartGame scene which will run according to the value I got from the label.
However, I am unable to get the text of label. Once I get this value, I can assign it to a variable which I can use to switch levels.
All I want is how to get the text of CCLabelTTF.
Thanks
Use NSString *str = [cclabelTTFObj string];