I'm looking for a quick way to tell if the device is being held with the home button to the right or to the left. Is there a function to do so?
Look at the UIDevice documentation. There is an orientation property available. Something like:
UIDeviceOrientation d = [[UIDevice currentDevice] orientation];
The values of d you are looking for are:
UIDeviceOrientationLandscapeLeft
- The device is in landscape mode, with the device held upright and the home button on the right side.
UIDeviceOrientationLandscapeRight
- The device is in landscape mode, with the device held upright and the home button on the left side.
Related
Hi in my application i would like to know the statusbarorientation value. For that i am using [UIApplication sharedApplication].statusBarOrientation method. Actually this method have to return 4 for landscape and 2 for potrait mode. But this method returning the values in opposite way. Means for landscape 2 and for potrait 4. Please let me know how to fix this issue.In supportedInterfaceOrientations method i am using return UIInterfaceOrientationMaskAll;
Please help me in resolving this issue.
It probably happens because the UIDeviceOrientationLandscapeRight is assigned to UIInterfaceOrientationLandscapeLeft and UIDeviceOrientationLandscapeLeft is assigned to UIInterfaceOrientationLandscapeRight.
The reason for this is that rotating the device requires rotating the content in the opposite direction.
Starting in iOS 8, you should use the UITraitCollection and UITraitEnvironment APIs, and size class properties as used in those APIs, rather than using UIInterfaceOrientation constants or otherwise writing your app in terms of interface orientation.
Anyway, taking the orientation in this way worked for me.
var orientation = UIApplication.SharedApplication.StatusBarOrientation;
switch (orientation)
{
case UIInterfaceOrientation.PortraitUpsideDown:
// The device is in portrait mode but upside down, with the device held upright and the home button at the top.
case UIInterfaceOrientation.Portrait:
// The device is in portrait mode, with the device held upright and the home button on the bottom.
case UIInterfaceOrientation.LandscapeLeft:
// The device is in landscape mode, with the device held upright and the home button on the left side.
case UIInterfaceOrientation.LandscapeRight:
// The device is in landscape mode, with the device held upright and the home button on the right side.
case UIInterfaceOrientation.Unknown
// The orientation of the device cannot be determined.
}
Consider also that
If your app has rotatable window content, however, you should not
arbitrarily set status-bar orientation using this method. The
status-bar orientation set by this method does not change if the
device changes orientation.
I have an iPad in which I start at a landscape left orientation, however when I do:
UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
it doesn't detect it as landscape left. I had to rotate it to portrait mode and then back to landscape left again, and then when I check the orientation, now it's correct. However, initially when it's launched it is not correct. Why is this? How do I resolve this?
Never use the Device Orientation if you would like to determine the Interface Orientation!
If you have a reference to the RootViewController of your main window, you could ask it for its interfaceOrientation.
If you don't, use [UIApplication sharedApplication].statusBarOrientation to determine the Interface Orientation.
Is there a way to manually check current position of device AND ask device to automatically rotate it without waiting for user to actually rotate the device?
Currently I control the rotation with several IFs in -shouldAutorotateToInterfaceOrientation but in few situations I have to stop the view from rotating and enable it again and I don't want user to rotate the device twice to have the desired orientation.
for checking Orientation
UIInterfaceOrientation orientation = [[UIDevice currentDevice] orientation];
then based on your condition you can change device orientation as you wish..
you can use :
[UIApplication sharedApplication].statusBarOrientation = UIInterfaceOrientationPortrait;
or what ever you want.
or you can go for following but this is not do
[[UIDevice currentDevice] setOrientation:UIDeviceOrientationPortrait];
I'm listening to the UIDeviceOrientationDidChangeNotification in order to adjust my UI based on the device's orientation.
The problem is that the device orientation I'm getting from the notification seems inaccurate. If I start with the phone in portrait orientation and vertical (as if taking a picture with it) the orientation I get from the notification is correct. As the tilt of the phone approaches horizontal (as in laying flat on a table top) the orientation switches to landscape. This happens much before the phone is actually flat on the table. And this is without rotating the phone towards landscape at all. Is as if it had a preference for landscape.
When using other apps, like mail, I don't see this same behavior. It seems that mail only switches orientation once it's really sure you've gone to the new orientation.
Any help greatly appreciated.
Thanks,
I found my problem.
In viewWillAppear I have:
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver: self selector: #selector(didChangeOrientation:) name: UIDeviceOrientationDidChangeNotification object:
[UIDevice currentDevice]];
And here is the notification handler:
- (void) didChangeOrientation: (id)object {
UIInterfaceOrientation interfaceOrientation = [[object object] orientation];
//DLog(#"val is %i", interfaceOrientation);
if (interfaceOrientation == UIDeviceOrientationLandscapeLeft || interfaceOrientation == UIDeviceOrientationLandscapeRight || interfaceOrientation == UIDeviceOrientationPortrait) {
[self orientInterface:interfaceOrientation];
}
By checking that the orientation is one of the two landscapes or the two portraits I'm ignoring the UIDeviceOrientationFaceUp and UIDeviceOrientationFaceDown orientations. That way setting the phone in one of this two orientations won't have an effect on my interface's orientation.
My problem was that I was no considering the faceUp and faceDown and was handling them both in an else statement which was assuming landscape.
If your only interest is your interface orientation (ie landscape or portrait orientation of the device), you should NOT use UIDevice:orientation (or the UIDeviceOrientation* constants if you will), but rather use the UIApplication:statusBarOrientation, which uses the UIInterfaceOrientation* constants.
I use the following code to check for landscape modus:
static inline bool isOrientationIsLandscape() {
return UIInterfaceOrientationIsLandscape([[UIApplication sharedApplication] statusBarOrientation]);
}
And for portrait modus:
static inline bool isOrientationIsPortrait() {
return UIInterfaceOrientationIsPortrait([[UIApplication sharedApplication] statusBarOrientation]);
}
This cost me a whole morning to figure out, because there is no UIDeviceOrientationFace[Up|Down] on the simulator, only on the real device. So my app worked on the simulator all the time, but on the actual device I had some undefined behavoir during testing every now and then.
Now it works on the actual device like it does on the simulator.
HTH
The notifications are just one way to get at it, you can also read out the accelerometer yourself and implement it in exactly the way you see fit (with a delay and a certain time of non-rotation for example).
Don't know if it's a power drain to get those readouts, but if so, use the notification to know when things are moving, and then fire up the accelometer-reading.
i have to do something on rotation the device on the portrait mode but when i use the
(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
//[[[UIApplication sharedApplication]keyWindow]subviews removeFromSuperview ];
// return (interfaceOrientation == UIInterfaceOrientationLandscapeRight);
return YES;
}
following code and it work fine on the simulator but when i use to install the code in the device it make the device so much sensitive that if i just a little change the position in the device it execute this code and go to the view that i m showing on the rotation of the phone
than pls anyone tell me that how can i control the sensitivity of the device i mean that i just want when user complete a 90' rotation in the position than my code should execute but it just execute if just shake the phone in the same position .
thanks for any help
Balraj verma
You probably want to buffer the orientation information; that is, only change the orientation after you have received several indications from the sensor in a row that the orientation is different from what you're currently displaying.
From my understanding of what you have written, your application is too sensitive when the device is rotated? It's difficult to understand why this is; the code you've included states that you're application is willing to accept any rotation, but you've not stated how you deal with the rotation events afterwards.
Based on the info, I can only suggest that you add a check to in your code (perhaps where the rotation event is dealt with) and obtain the orientation from the device using:
[[UIDevice currentDevice] orientation];
which will return a UIInterfaceOrientation enum stating the current orientation of the device.
UIDeviceOrientationPortrait
UIDeviceOrientationPortraitUpsideDown
UIDeviceOrientationLandscapeLeft
UIDeviceOrientationLandscapeRight
You can then use this to establish whether there's a need to change the orientation. (Note: this is iPhone OS 2.0. I believe that OS 3.0 has more including lying face up/down, etc.)
- (void) didRotate:(NSNotification *)notification
{
UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
if (orientation == UIDeviceOrientationLandscapeRight)
{
NSLog(#"Landscape Right!");
}
}
If you find that the orientation switches too quickly you may want to buffer the information, creating several sample points that you can compare before switching to the new orientation.