iOS Question Designer script 100%x and 100%y

rfresh

Well-Known Member
Licensed User
I have an iPhone 6 and the Apple site says its screen resolution is 1334x750.

However, my test code below returns 559x375.

What am I doing wrong?

B4X:
ButtonDayNight.Text = 100%y & "x" & 100%x
 

klaus

Expert
Licensed User
iOS uses Points instead of Pixels.
1 iOS point is equivalent to 1dip in Android.

Extract from the iOS documentation.

Points Versus Pixels.
In iOS there is a distinction between the coordinates you specify in your drawing code and the pixels of the
underlying device. When using native drawing technologies such as Quartz, UIKit, and Core Animation, the
drawing coordinate space and the view’s coordinate space are both logical coordinate spaces, with
distances measured in points. These logical coordinate systems are decoupled from the device coordinate
space used by the system frameworks to manage the pixels onscreen.
The system automatically maps points in the view’s coordinate space to pixels in the device coordinate
space, but this mapping is not always one-to-one. This behavior leads to an important fact that you should
always remember:
One point does not necessarily correspond to one physical pixel.
The purpose of using points (and the logical coordinate system) is to provide a consistent size of output that
is device independent. For most purposes, the actual size of a point is irrelevant. The goal of points is to
provide a relatively consistent scale that you can use in your code to specify the size and position of views
and rendered content. How points are actually mapped to pixels is a detail that is handled by the system
frameworks. For example, on a device with a high-resolution screen, a line that is one point wide may
actually result in a line that is two physical pixels wide. The result is that if you draw the same content on two
similar devices, with only one of them having a high-resolution screen, the content appears to be about the
same size on both devices.
 

rfresh

Well-Known Member
Licensed User
Thanks for that Klaus. I thought I could detect an iPhone6 vs an iPhone7 vs an iPad by checking the device screen width. I don't have all of those actual devices (only the iPhone6) so I was relying on reading the screen resolution specs.
 

rfresh

Well-Known Member
Licensed User
The iPhone6,7 and 8 all have the same screen resolutions: 1334x750. I am unsure of what to set for a new variant for these iPhones. Do I create a new 1334x750 variant or do I use what 100%x and 100%y returned: 559x375?
 

rfresh

Well-Known Member
Licensed User
A friend of mine let me test 100%x and 100%y on his iPhone 10.

The iPhone 10 specs says this screen is 2436x1125. 100%x is 375 and 100%y is 724. Is this because my test app has only one variant?

I've attached my test app.
 

Attachments

sorex

Expert
Licensed User
do you really need to know the actual resolution?

if you know that the aspect ratio is 0.51 (375/724) multiply that with 4 and once with 16 then you know it leans more to 16:9 (16:8.28) than to 4:3(2.07).

I don't use ratio variants but just place everything based on math in the actual code because I want it to look 'exactly the same' on all devices.
The same goes if you really need totally different layouts but then you need to check that aspect ratio first and decide which way you want to go next.
 

Erel

Administrator
Staff member
Licensed User
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