I have 1 view ,now i click on it's subview
There are 2 conditions for that,
1> if subview is in portrait mode and then i switch it to landscape mode,at that time i wrote code and it works perfectly.
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver: self selector: #selector(receivedRotate:) name: UIDeviceOrientationDidChangeNotification object: nil];
-(void) receivedRotate: (NSNotification*) notification
{
self.View.autoresizingMask = UIViewAutoresizingFlexibleWidth/UIViewAutoresizingFlexibleHeight;
}
but if i put my device initially in landscape mode and then click on subview then how to autoresizie subview
My que:-
How to find out the method for the position of device?
How to find my device is in portrait or landscape mode?
you can check [[UIDevice currentDevice] orientation].
Related
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.
So my iPhone application currently has a tabviewcontroller that populates the entire screen. The app only runs in portrait mode. My task has been to detect device orientation changes, and once it changes to landscape, have a new uiview populate the entire screen.
I already have the device orientation change detection working. I've used an NSNotificationCenter to successfully call a helper method, deviceOrientationChanged, once an orientation change is detected. IF the change was to landscape mode, I run a certain block of code.
In this block of code I have already tried various things, none of which are successful. Simply saying self.view = newViewThing; does not work because the statusbar is still present at the top and the tabs are still present at the bottom.
I have also tried adding this newViewThing as a subview to the UIWindow. This did not work because while the view was added, it was not oriented correctly.
THE QUESTION IS: is there a way to load an entirely new uiview once a device orientation change is detected? Thank you in advance.
Yes, there is a way to load a new view. I make it in my app that way:
- (void)orientationChanged:(NSNotification *)notification
{
// We must add a delay here, otherwise we'll swap in the new view
// too quickly and we'll get an animation glitch
[self performSelector:#selector(updateLandscapeView) withObject:nil afterDelay:0];
}
- (void)updateLandscapeView
{
UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
if (UIDeviceOrientationIsLandscape(deviceOrientation) && !isShowingLandscapeView)
{
[self presentModalViewController:self.landscapeView animated:YES];
isShowingLandscapeView = YES;
}
else if (deviceOrientation == UIDeviceOrientationPortrait && isShowingLandscapeView)
{
[self dismissModalViewControllerAnimated:YES];
isShowingLandscapeView = NO;
}
}
And also I have added this code to viewDidLoad:
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(orientationChanged:)
name:UIDeviceOrientationDidChangeNotification object:nil];
and this code to dealloc:
[[NSNotificationCenter defaultCenter] removeObserver:self];
[[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];
In my application i am using MPMoviePlayerViewController to play online video. The video should play in fullscreen mode when in landscape and the fullscreen mode should be dismissed when it rotates to portrait mode.
I am able to play the video in fullscreen mode. But not able to dismiss it when the device orientation changes to portrait mode.
I am using [mpController.moviePlayer setFullscreen:FALSE animated:YES];
Someone please help.
Thanks in advance.
I assume you're trying to detect the orientation change in the view controller that present MPMoviePlayerViewController? This code won't be fired after the movie player view controller is presented because it—not its parent—will receive the rotation events.
You can, however, subscribe to the device rotation notifications and dismiss the movie player view controller whenever you detect a rotation to portrait:
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
[defaultCenter addObserver:self selector:#selector(deviceOrientationDidChange:) name: UIDeviceOrientationDidChangeNotification object:nil];
// Present MPMoviePlayerViewController here
Elsewhere in the same view controller:
- (void)deviceOrientationDidChange:(NSNotification *)notification
{
UIDevice *currentDevice = [UIDevice currentDevice];
[currentDevice endGeneratingDeviceOrientationNotifications];
if (...) // Check currentDevice.orientation to see if it's what you want
{
// Do whatever you want now that you have the orientation you want
}
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];
}
Set observer for UIDeviceOrientationDidChangeNotification or UIApplicationWillChangeStatusBarOrientationNotification, check new required orientation and set new mode for MPMoviePlayerViewController.
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];
How can I center an activity indicator programmatically regardless of screen orientation?
Try setting the center property of your activity view, like this:
activity.center = CGPointMake(self.view.frame.size.width/2,self.view.frame.size.height/2);
In viewDidLoad, register for notifications for the device rotation:
- (void)viewDidLoad {
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(didRotate:)
name:UIDeviceOrientationDidChangeNotification object:nil];
}
and implement didRotate:
-(void)didRotate:(NSNotification *)notification {
if (activity) {
activity.center = CGPointMake(self.view.frame.size.width/2,self.view.frame.size.height/2);
}
}
I suggest you use https://github.com/jdg/MBProgressHUD
Which is a great library for doing all kinds of "Loading" screens.