App Designer MATLAB: if-else condition not working

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Makram
Makram 2022-10-15
移动：Image Analyst 2022-10-16
I am creating a GUI in App Designer (version: MATLAB R2022b).
I have a first function configured which allows users to Load an image in the GUI (important part of the code: I transform the value of another button on the app, the StatebuttonButton, to 1 at the end of the function exection):
function LoadimageButtonPushed(app, event)
[filename,filepath]=uigetfile({'*.jpg;*.tif;*.png;*.gif;*.bmp','All Image Files'},'Select an image');
fullname=[filepath, filename];
ImageFile=imread(fullname);
imagesc(app.UIAxes_3, ImageFile);
app.StatebuttonButton.Value = 1;
end
Then a second function that should allow users to crop the image loaded above. However, I want to make sure that an image was loaded by the user in the first place (before pushing the crop button), so I have configured the if-else statement below to do so. Based on the "Value" of app.StatebuttonButton, it should know whether an image was loaded in the first place:
function CropButtonPushed(app, event)
if not(app.StatebuttonButton.Value == 1)
f=errordlg('Please load an image first','User Action Error');
else
;
end
% rest of function
% rest of function
end
The problem is that the if-else statement is not working, and I am not even receiving any error from MATLAB explaining why.
Can someboy help?

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采纳的回答

Hiro Yoshino
Hiro Yoshino 2022-10-16
移动：Image Analyst 2022-10-16
I found a solution for this.
errordlg is not suitable for App Designer; you should use uialert instead. There is a small note at the bottom of the errordlg document and it says use "uialert" in the case of app building.
Hope this helps.

更多回答（1 个）

Hiro Yoshino
Hiro Yoshino 2022-10-15
编辑：Hiro Yoshino 2022-10-15
What is the default value for app.StatebuttonButton.Value? Have you checked it in the first place?
If it is "1", it always skip the if condition even when you haven't uploaded any images.
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Makram
Makram 2022-10-15
Thanks for the help. I ended up finding a better solution, I made the "cropbutton" invisible when the app is started, and then only when an image is loaded I make it visible.

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