As a new AppDeveloper, I've never used orientation. So, I would like to try to learn with a simple task. What I want to do is have the screen fade to black when the device is set face down. Is that something that would be simple to do, that perhaps somebody could assist me in, or provide helpful information?
Thanks! :D
Your help is appriciated
You can use orientation (using the XYZ values when the screen is face down). I do not recommend this, because your screen will fade out even if a user is using the app while lying down, and staring up at the screen.
There is an easier and cleaner way. Notice how during phone calls, having the phone close to your ear blacks out the screen?
You can access that property by monitoring the proximityState property of UIDevice. Details here
Doing something like:
BOOL closeToUser = [[UIDevice currentDevice] proximityState];
will assign a YES to closeUser when the device is face down on a surface of some kind, and a NO when it is not
If the value is YES, you can invoke code to do whatever you want.
Related
What I would like to do is simply make the iDevice fade the screen to black one the proximityState returns yes. However, I am not sure of how to enable it, or monitor it. Would someone be able to simply provide syntax of enabling and monitoring proximityState?
The help would be highly appreciated for a new programmer like me.
Thanks!
-Jake
You need to use the [UIDevice currentDevice] singleton. First set proximityMonitoringEnabled to YES. Then, you can access the proximity information through the proximityState property. Subscribe to changes to the proximity state by observing the UIDeviceProximityStateDidChangeNotification notification.
i guess i missed something really important in the apple manuals which causes me having this problems.
I will describe what i want to have and what i get instaed + what i do.
Preamble:
goal of my work is a app having a login-screen. this screen is supposed to be placed ontop of all other views, to fade out later. so in this case i guess i already break a rule, in case i understood that "only-one-main-window-guideline" correctly.
What i want:
having an universal application √ check
having an universal application which has UIInterfaceRotation for iPad only √ check
not having troubles regarding uiinterfaceorientation or uideviceorientation on startup allowing me to show all views in proper dimension without having to rotate a few times to have it all properly positioned. - not checked
What i get:
when i start the app in landscape, which is default orientation from my views in interface-Builder, its perfeclty aligned and i can rotate all i want, its perfect, stays perfefct, hooray
when i start the app in portrait, i see the landscape-views flying around on the screen - each time on diffrent pace - at least that seems like. when i rotate the app now, forth and back, its all aligned as it should - also perfectly as wanted.
What i do:
99% of all rotation-related settings is made in interface builder, i currently just have some did-change-methods to change background-images when rotation is done and so on.
i noticed, that even when i build the screen after device knows its orientation, it leads to this.
so in other words:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[self addEventListener:UIDeviceOrientationDidChangeNotification sel:#selector(buildScreen)];
....
note: addEventListener is a small notification-category i created for easier handling. so no magic in here.
in build-screen i add all subviews.
at first, the actualy screen in the background, this screen will get the login as subview (which does not matter since when i add login to main-window itself, situation is the same).
So in this case, i really dont know what do do next.
Once orientation-alignment is setup, it all fits perfectly as i defined in IB.
Any help, links, code, etc, appreciated. thank you very much! i tried searching for this, just found many similar problems, no solutions. so a little sorry in case i seem to ask the very same question, a big one if i really do.
Best Regards
I wouldn't normally recommend this because i think it's annoying as a user, but you could try the Info.plist setting
Initial interface orientation
and set this to the Landscape if this is what works for you.
Could be a temporary workaround. I recon your issues are much more complex though than a simple suggestive fix.
I did not find a proper solution, so i used multiple-xib files to get it done. It's annoying but it works well.
I'd like to take a sneak picture while user is playing my app and show the pic after a certain time period.
If that's not possible, I'd like to decrease the camera view size.
Is that possible?
Thank you
I dont think Apple will allow you to "sneak a pic" of the user. Your app may or may not get rejected, you may want to think of another way to allow the app to take snap of the user, maybe an alert, much like the Location dialog, asking the user to allow the action.
UIImagePicker *imagePicker.cameraViewTransform =
CGAffineTransformScale(imagePicker.cameraViewTransform, 1.0f, .5f);
You can change the by using this one.
It is completely possible. Just have a UIView overlay your UIImagePickerView. Use the
-takePicture method to randomly take a picture without them pressing anything.
I'm playing around with the TV-out Adapter for the iphone. My goal is to have an external window display on my tv in order to play movies from my iphone.
the big problem I've got now, is that if the phones orientation changes (physically) the window that shows on the tv turns as well. which is of course unwanted behaviour..
So far i return NO from shouldAutoRotateToInterfaceOrientation. But it still turns and turns.
I'm very grateful for any help on that topic
cheers
sam..
Ah well the solution was rather simple.
I had to assign a RootViewController to the Window that I'm using. Said Rootviewcontroller then needs to implement a shouldAutoRotateToInterfaceOrientation Method (that of course returns NO).
I need to do a lot of things with UISlider. First of all I want to know what are all the things are possible and what are not. Please give me ideas for the doable ones.
I need to add a slider control in my iPhone application (that should resemble the one which is displayed in the iphone when the phone is getting charged).
Can the round button of the UISlider be changed to any other shape. Can any image be added on top of that round button?
When the UISlider is being moved, we need ad a sound effect(for example car stating sound) and when the sliding ends the sound should be stopped. is this possible? if yes, please gimme ideas to do this. 3. vibration should also happen while sliding (possible?)
Thanks in advance!!!
All of these can be done via the public API. Read the docs :-)
The button is called the "thumb image"; there's a property to replace the image.
Assign a delegate and set the 'continuous' property on the slider.
See the Application Programming Guide for more on delegates.
As far as question number 2, just write up the methods to accomplish playing a sound and vibrating and then have them fire when the value changes on the slider.