I want to keep my view landscape. For that i am using this code but BAD_ACCESS is coming.
Here I am writing this code for camera overlayView.
-(void)viewDidLoad
{
[[UIDevice currentDevice] setOrientation:UIInterfaceOrientationLandscapeLeft];
//Set Notifications so that when user rotates phone, the orientation is reset to landscape.
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
//Refer to the method didRotate:
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(didRotate:)
name:#"UIDeviceOrientationDidChangeNotification" object:nil];
[super viewDidLoad];
}
- (void) didRotate:(NSNotification *)notification
{
//Maintain the camera in Landscape orientation
[[UIDevice currentDevice] setOrientation:UIInterfaceOrientationLandscapeLeft];
}
Why it is giving BAD ACCESS ?
To keep your view landscape, just return NO in your shouldAutorotateToInterfaceOrientation: method for portrait orientations, like tihs :
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return UIInterfaceOrientationIsLandscape(interfaceOrientation);
}
Related
I am referring to DMD Panorama app.
As you can see there is a Yin-yang symbol at the top section of this image.
Once we rotate our device, the two symbols come closer, like below:
Can you please let me know how do I detect rotation of the device so that when device is rotated, these two images come closer?
I appreciate your response.
Add a notifier in the viewWillAppear function
-(void)viewWillAppear:(BOOL)animated{
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(orientationChanged:) name:UIDeviceOrientationDidChangeNotification object:nil];}
The orientation change notifies this function
- (void)orientationChanged:(NSNotification *)notification{
[self adjustViewsForOrientation:[[UIApplication sharedApplication] statusBarOrientation]];}
which in-turn calls this function where the moviePlayerController frame is orientation is handled
- (void) adjustViewsForOrientation:(UIInterfaceOrientation) orientation {
if (orientation == UIInterfaceOrientationPortrait || orientation == UIInterfaceOrientationPortraitUpsideDown)
{
//load the portrait view
}
else if (orientation == UIInterfaceOrientationLandscapeLeft || orientation == UIInterfaceOrientationLandscapeRight)
{
//load the landscape view
}}
in viewDidDisappear remove the notification
-(void)viewDidDisappear:(BOOL)animated{
[[NSNotificationCenter defaultCenter]removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];}
first you register for notification
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(detectDeviceOrientation) name:UIDeviceOrientationDidChangeNotification object:nil];
then add this method
-(void) detectDeviceOrientation
{
if (([[UIDevice currentDevice] orientation] == UIDeviceOrientationLandscapeLeft) ||
([[UIDevice currentDevice] orientation] == UIDeviceOrientationLandscapeRight))
{
// Landscape mode
} else if ([[UIDevice currentDevice] orientation] == UIDeviceOrientationPortrait)
{
// portrait mode
}
}
Try doing the following when the application loads or when your view loads:
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter]
addObserver:self selector:#selector(orientationChanged:)
name:UIDeviceOrientationDidChangeNotification
object:[UIDevice currentDevice]];
Then add the following method:
- (void) orientationChanged:(NSNotification *)note
{
UIDevice * device = note.object;
switch(device.orientation)
{
case UIDeviceOrientationPortrait:
/* set frames for images */
break;
case UIDeviceOrientationPortraitUpsideDown:
/* set frames for images */
break;
default:
break;
};
}
The above will allow you to register for orientation changes of the device without enabling the autorotate of your view.
I have a game in which the orientation of the device affects the state of the game. The user must quickly switch between Landscape, Portrait, and Reverse Landscape orientations. So far I've been registering the game for orientation notifications via:
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
But it is far too slow - there seems to be about a second delay between rotating the phone and the notification actually being fired. I need a way to INSTANTLY detect changes in the device's orientation. I have tried experimenting with the gyroscope, but am not yet familiar enough with it to know whether or not it is the solution I am looking for.
Add a notifier in the viewWillAppear function
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(orientationChanged:) name:UIDeviceOrientationDidChangeNotification object:nil];
}
The orientation change notifies this function
- (void)orientationChanged:(NSNotification *)notification{
[self adjustViewsForOrientation:[[UIApplication sharedApplication] statusBarOrientation]];
}
which in-turn calls this function where the moviePlayerController frame is orientation is handled
- (void) adjustViewsForOrientation:(UIInterfaceOrientation) orientation {
switch (orientation)
{
case UIInterfaceOrientationPortrait:
case UIInterfaceOrientationPortraitUpsideDown:
{
//load the portrait view
}
break;
case UIInterfaceOrientationLandscapeLeft:
case UIInterfaceOrientationLandscapeRight:
{
//load the landscape view
}
break;
case UIInterfaceOrientationUnknown:break;
}
}
in viewDidDisappear remove the notification
-(void)viewDidDisappear:(BOOL)animated{
[super viewDidDisappear:animated];
[[NSNotificationCenter defaultCenter]removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];
}
I guess this is the fastest u can have changed the view as per orientation
That delay you're talking about is actually a filter to prevent false (unwanted) orientation change notifications.
For instant recognition of device orientation change you're just gonna have to monitor the accelerometer yourself.
Accelerometer measures acceleration (gravity included) in all 3 axes so you shouldn't have any problems in figuring out the actual orientation.
Some code to start working with accelerometer can be found here:
How to make an iPhone App – Part 5: The Accelerometer
And this nice blog covers the math part:
Using the Accelerometer
Why you didn`t use
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
?
Or you can use this
-(void) willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
Or this
-(void) didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
Hope it owl be useful )
For my case handling UIDeviceOrientationDidChangeNotification was not good solution as it is called more frequent and UIDeviceOrientation is not always equal to UIInterfaceOrientation because of (FaceDown, FaceUp).
I handle it using UIApplicationDidChangeStatusBarOrientationNotification:
//To add the notification
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(didChangeOrientation:)
//to remove the
[[NSNotificationCenter defaultCenter]removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];
...
- (void)didChangeOrientation:(NSNotification *)notification
{
UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
if (UIInterfaceOrientationIsLandscape(orientation)) {
NSLog(#"Landscape");
}
else {
NSLog(#"Portrait");
}
}
Try making your changes in:
- (void) viewWillLayoutSubviews {}
The code will run at every orientation change as the subviews get laid out again.
#vimal answer did not provide solution for me. It seems the orientation is not the current orientation, but from previous orientation. To fix it, I use [[UIDevice currentDevice] orientation]
- (void)orientationChanged:(NSNotification *)notification{
[self adjustViewsForOrientation:[[UIDevice currentDevice] orientation]];
}
Then
- (void) adjustViewsForOrientation:(UIDeviceOrientation) orientation { ... }
With this code I get the current orientation position.
I tried checking the UIInterfaceOrientation of the current presented view controller and for some reason it always returns landscape.
UIInterfaceOrientation currentOrientation = (UIInterfaceOrientation)[[UIApplication sharedApplication] statusBarOrientation];
if (currentOrientation == UIInterfaceOrientationPortrait){
self.scrollView_.colMargin = 50;
} else {
self.scrollView_.colMargin = 130;
}
Any idea why?
You can check the orientation as follows:
UIInterfaceOrientation orientation = [[UIDevice currentDevice] orientation];
if( orientation == UIDeviceOrientationPortrait ) ...
From the iOS UIDevice Class Reference:
orientation
Returns the physical orientation of the device. (read-only)
Discussion
The value of this property always returns 0 unless orientation notifications have been enabled by calling beginGeneratingDeviceOrientationNotifications.
So you need to do something like:
- (void) viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(orientationChanged:) name:UIDeviceOrientationDidChangeNotification object:nil];
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
and then don't forget to
[[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];
when you viewDidUnload
Casting is not magic. The status bar orientation my use different values than that of the interface orientation. Use the current view controllers self.interfaceOrientation property instead.
What i would like to do is to rotate at landscape mode and leave the toolbar and navigation bar at ( vertical to the right for the toolbar and vertical to the left for the navigation bar), but only rotating the view and the icons on the toolbar and navigation bar..
What i have done so far is using the willAnimateSecondHalfofRotation.When going to landscapemode the position is what i wanted but i can see the transition from rotating and it looks bad.What i am trying to do is something like the camera of the iphone when only the icons of the toolbar are being rotating...
Could you help me?
Thanks in advanced.
Lor
Disable auto-rotation:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
Register for UIDeviceOrientationDidChange notifications:
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(orientationChanged:)
name:UIDeviceOrientationDidChangeNotification
object:nil];
Respond to device orientation changes:
- (void)orientationChanged:(NSNotification *)notification {
// Adjust views according to [[UIDevice currentDevice] orientation];
}
Don't forget to unregister
[[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] removeObserver:self];
I am developing a iphone/ipad app.
Problem is that when i change the orientation of ipad portrait to Landscape, back button of navigation controller stops working.
It"s work fine when orientation not changed.
i am using this code
- (BOOL) isPad{
#ifdef UI_USER_INTERFACE_IDIOM
return (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad);
#else
return NO;
#endif
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
if ([self isPad]) {
return YES;
}
else
{
return UIInterfaceOrientationIsPortrait(interfaceOrientation);
}
}
What"s the wrong with this code?
This will work :
-(void)viewWillAppear:(BOOL)animated
{
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(receivedRotate:) name:UIDeviceOrientationDidChangeNotification object:nil];
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
}
-(void)viewWillDisappear:(BOOL)animated
{
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];
}
Now implement the following method :
-(void)checkOrientation
{
UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
if (orientation == UIDeviceOrientationLandscapeLeft||orientation==UIDeviceOrientationLandscapeRight)
{
// Set x coorinate of views you want to change
}
else
{
// Set x coordinates of views to initial x xoordinates.
}
}
Create recievedRotate :
- (void)receivedRotate:(NSNotification *)notification
{
[self checkOrientation];
}
In viewDidLoad :
-(void)viewDidLoad
{
// Code
[self checkOrientation];
}
My guess is that your button is out of the view's frame and thus won't receive touch events. I think something is wrong with the way your app redraws on orientation change.