iOS Question ImageView - TopMiddle

Alexander Stolte · Jul 29, 2020

is it possible to set the image TopMiddle instead of TopLeft?

B4X:

iv.MODE_TOPLEFT

Because this looks not good:

Erel · Jul 29, 2020

The best way to resize images, especially if you are building a cross platform solution, is to put the ImageView in a panel and move the ImageView based on the bitmap size. It is very simple and it will behave exactly like you want it.

Alexander Stolte · Jul 29, 2020

there is a way to set this, but I am not a NativeObject expert ?

B4X:

Dim naobj As NativeObject = iv                   
iv.ContentMode = naobj.GetField("UIViewContentMode ").GetField("top")

iOS Tutorial => How the Mode property affects an image

Learn iOS - How the Mode property affects an image

riptutorial.com

Stretching, Redrawing and Positioning with contentMode

The contentMode property of UIView allows you to control how to layout a view when the view’s bounds change. The system will not, by default, redraw a view each time the bounds change. That would be wasteful. Instead, depending on the content mode, it can scale, stretch or pin the contents to a...

useyourloaf.com

Semen Matusovskiy · Jul 29, 2020

To get contentMode use

B4X:

Dim no As NativeObject = ImageView1
intCurrentMode = no.GetField ("contentMode").AsNumber

To set:

B4X:

Dim no As NativeObject = ImageView1
no.SetField ("contentMode", intNewMode)

intNewMode possible values: see https://developer.apple.com/documentation/uikit/uiviewcontentmode?language=objc
UIViewContentModeScaleToFill is equal 0. UIViewContentModeScaleAspectFit is equal 1. UIViewContentModeScaleAspectFill is equal 2. And so on, according an order in Apple's description.

BTW, B4i does not control a value in ImageView.ContentMode. So, you can simply assign ImageView.ContentMode = 5 (UIViewContentModeTop) and to ignore a warning #22.

Alexander Stolte · Jul 29, 2020

Semen Matusovskiy said:
BTW, B4i does not control a value in ImageView.ContentMode. So, you can simply assign ImageView.ContentMode = 5 (UIViewContentModeTop) and to ignore a warning #22.

Thanks, you are the best.

Alexander Stolte · Jul 29, 2020

I'm using this

B4X:

Dim no As NativeObject = iv
no.SetField ("contentMode", 5)

instead of this

B4X:

iv.ContentMode = 5

because you cant compile if you set this directly.

Semen Matusovskiy · Jul 29, 2020

because you cant compile if you set this directly.

B4i 6.80 compiles and works. IDE gives warning (#22). If you do not want to see a warning, use #IgnoreWarnings

Alexander Stolte · Jul 29, 2020

Semen Matusovskiy said:
B4i 6.80 compiles and works. IDE gives warning (#22). If you do not want to see a warning, use #IgnoreWarnings

in release mode too? In debug mode it worked, but not on release.

Semen Matusovskiy · Jul 29, 2020

You are right.

cast of an Objective-C pointer to 'UIViewContentMode *' (aka 'enum UIViewContentMode *') is disallowed with ARC

Strange... It's possible to find a workaround, but no reason to do this, because SetField requires 2 statements only.

iOS Question ImageView - TopMiddle

Alexander Stolte

Expert

Erel

B4X founder

Alexander Stolte

Expert

iOS Tutorial => How the Mode property affects an image

Stretching, Redrawing and Positioning with contentMode

Semen Matusovskiy

Well-Known Member

Alexander Stolte

Expert

Alexander Stolte

Expert

Semen Matusovskiy

Well-Known Member

Alexander Stolte

Expert

Semen Matusovskiy

Well-Known Member

Similar Threads

iOS Question ImageView - TopMiddle

Expert

B4X founder

Expert

Well-Known Member

Expert

Expert

Well-Known Member

Expert

Well-Known Member

Similar Threads

Privacy & Transparency

Privacy & Transparency