Two issues with the iOS app

Targets iOS
1

I have two questions about iOS apps.

  1. I have turned on “Photos Access” in Build Settings, and am using the ImagePicker control to import photos from the photo app linked to the device’s Apple ID into the app. However, when I want to open photos with ImagePicker and import multiple photos into the app, I currently have to open ImagePicker and add them one by one. I don’t need to use ImagePicker, but is it possible to select multiple photos?

  2. I have a large MobileCanvas set up on the screen, and is there a way to zoom in and out of the picture displayed on the Canvas by pinching with two fingers only within this Canvas?

2
  1. You will need to use MBS plug-ins to be able to select multiple pictures at once.
  2. Might be possible with iOSKit
3

For #1:

4
  1. I’ve had good luck with this code:
5

Thank you @Jeremie_L .

I can use MBS, but I was not able to select more than one at a time just by using this class. Do I need to set any special parameters?

Thank you.

6

Thanks @Jeremie_L .

I tried various things with the Xojo program of iOS Kit, but I couldn’t find any part related to zooming in/out with two fingers. I would be grateful if you could give me more details.

Thank you.

7

Thank you @Art_Gorski .

I am also trying this method that was suggested to me. However, the x and y coordinates of DrawPicture when resized cannot be reproduced well with the code written here, and it seems that some adjustments are necessary.

Also, in my case, I am developing something like a paint app, and I will be drawing with a pen on the enlarged picture, so it will take some time to adjust it.

Thank you.

8

I believe you can do this with the Gesture Recogniser object.

Before I learned that this existed, I rolled my own by detecting the fact that two points were in use,
recording their start positions, then watching how they changed.
I find the distance between them , and adjust the ‘zoom factor’ accordingly.

//In the pointerdrag event

If pointerinfo.ubound = 1   Then //multi touch ..
  var thisdistance as double
  var adjby as integer 
  static lastx,lasty as integer
  
  thisdistance =  abs(pointerinfo(0).position.DistanceTo( pointerinfo(1).position))
  
  if lastdistance = -1 then
    //just store it
    lastdistance = thisdistance
  else
    
    
    adjby = 0
    if  thisdistance > lastdistance  and  abs (thisdistance - lastdistance) >= 10 then
      adjby = 1  // I change my zoom settings in increments of 1
    end if
    
    if  thisdistance < lastdistance  and  abs (thisdistance - lastdistance) >= 10 then
      adjby = -1
    end if
    
    lastdistance = thisdistance
    
  zoom.Value = zoom.Value + adjby


  end if
  Me.refresh
  
  
  Exit Sub
  
else
  lastdistance = -1
  
End If
1 Like
9

Thank you @Jeff_Tullin .

I’ll give this a try too, and report back on the results later.

10

i note that lastx and y are unused here.
Lastdistance and thisdistance are defined elsewhere