iOS Question slower app opening than other apps

[sorex]

Hello,

When I open one of the apps made by B4A I see the app load like this

(White) empty screen
a white bar appears for a few miliseconds with time, wifi, battery info
the actual app appears


When I open one of the apps that's default on the iPhone 4s they open instantly.

What is the difference between the 2?

are the pure objC compiled ones just a lot faster than what B4A creates ?

 

[MikeH]

I have it too:

http://www.mhnw11494.pwp.blueyonder.co.uk/Misc/VID_20150818_195112.mp4

 

[sorex]

yes, it's visible in the video aswell.

altho when I run your app on my iphone 4s that white bar is there for almost 2 seconds.

it almost looks that the debugger connect page is still inbetween even in release mode.

 

[JanPRO]

I guess your Application_Start sub is too large, so it contains too many processes, but it's just a guess ...

 

[sorex]

It also happends on an empty app that just loads a layout with 1 label.

 

[JanPRO]

Sorry, but I really can't see this issue with an empty app ...

are the pure objC compiled ones just a lot faster than what B4A creates ?

B4i generates also Objective C code

 

[tufanv]

When i used a searchview on load it happened to me.

 

[Erel]

I don't see it here with an empty project. Make sure that your app doesn't do any heavy stuff in Application_Start. Building an index for SearchView is a good example of a slow operation.

 

[ilan]

All my apps show a black screen on start for few ms, but this doesnot bother me.

Has it something to do with the launch image?

Can we add a launch image??

I just read this thread: https://www.b4x.com/android/forum/t...ack-screen-no-launch-image-yet.54822/#content

 

[Erel]

Can we add a launch image??

Yes: How to add launch images in B4i

 

[ilan]

Yes: How to add launch images in B4i

Thank you erel, i will try it out when i will find the time for it

 

[sorex]

it is the same screen as when the app is trying to connect to the ide but without the spinner and IP text.

can I record my iphone screen somehow?

 

[Erel]

Can you post your Application_Start code?

 

[sorex]

sure but like I said it's just an empty project with a label.

Private Sub Application_Start (Nav As NavigationController)
    NavControl = Nav
    Page1.Initialize("Page1")
    NavControl.ShowPage(Page1)
    Page1.RootPanel.LoadLayout("main")   
End Sub

 

[sorex]

I recorded it with my phone, a real blurred mess as it is too small to focus on but I'll see if I can extract a screenshot of it.

 

[Erel]

You can add a launch image: How to add launch images in B4i

 

[sorex]

I created an image based on the end result.

the problem is the black color I guess, can we force it to the background color that will be used in the app?



it is also happening when using that real fullscreen mode, you get a non fullscreen display first

 

[ilan]

I created an image based on the end result.

the problem is the black color I guess, can we force it to the background color that will be used in the app?

View attachment 36773

it is also happening when using that real fullscreen mode, you get a non fullscreen display first

Try to change your launch image... as erel has already recommendet

 

[sorex]

I'm reading that post now but if these images are white why do I get a black screen when opening my app and Mike's Wild Camping app?

 

[ilan]

I'm reading that post now but if these images are white why do I get a black screen when opening my app and Mike's Wild Camping app?

What phone are you using? It says that the white launch image is only for iphone 5/6/6+