如何锁定设备上更改方向？

Question

How to lock changing orientation on device?

I tried to use

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
  return UIInterfaceOrientationLandscapeRight;
}

and this

- (void)viewDidAppear:(BOOL)animated
{
    [self shouldAutorotateToInterfaceOrientation: UIInterfaceOrientationLandscapeRight];
    [super viewDidAppear:animated];
}

but nothing work when i use device. When app runs on simulator it works great.

simulator have iOS 6 and device 5.1.1. What i'm doing wrong?

Answer 1

Try this:

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
  return (interfaceOrientation == UIInterfaceOrientationLandscapeRight);
}

The method returns YES or NO answering the question "should I rotate to this orientation: interfaceOrientation". So you should return YES or NO - UIInterfaceOrientationLandscapeRight is not a BOOL. But you can use a comparison to return the BOOL like described above.

Answer 2

Open your project, select project file, goto summary section, and set desired interface orientation on 'Supported Interface Orientations' subsection. Good Luck!(for iOS 6.x)

Answer 3

In your project .plist file add Supported interface orientations

and set the item to Landscape(right home button)

Answer 4

If you want to do it only for 1 viewcontroller, you can do that either by

- (NSUInteger)supportedInterfaceOrientations{
return UIInterfaceOrientationMaskPortrait;
}

or by

//deprecated
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

and

- (BOOL)shouldAutorotate {
return self.interfaceOrientation == UIInterfaceOrientationPortrait;
}

If you want to set it for the whole app, make sure you change your Info.plist file and add Supported Interface Orientations

Answer 5

You just add following lines in .m file

#define IOS_OLDER_THAN_6 ( [ [ [ UIDevice currentDevice ] systemVersion ] floatValue ] < 6.0 )
#define IOS_NEWER_OR_EQUAL_TO_6 ( [ [ [ UIDevice currentDevice ] systemVersion ] floatValue ] >= 6.0 )

Then you have to add following methods in .m file

#ifdef IOS_OLDER_THAN_6

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
   return (toInterfaceOrientation == UIInterfaceOrientationLandscapeRight);
}
#endif

#ifdef IOS_NEWER_OR_EQUAL_TO_6

- (NSUInteger)supportedInterfaceOrientations
{
   return UIInterfaceOrientationMaskLandscapeRight;
}
#endif

Answer 6

For iOS 6 support include these two methods

- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return UIInterfaceOrientationMaskPortrait;
}

Also kindly note that this will work on xCode 4.5 +