[英]How to intercept iPhone rotation
在我的应用程序中,我有一个带有多个按钮的主页。 每个按钮打开一个单独的视图。 在每个视图中,如果我将设备放在横向,都会显示一个帮助视图。 一切正常,除了在任何视图下,如果我将iPhone放在桌子上(我不知道如何更好地摆放……),应用程序都会从该视图退出并返回第一个视图,家。 这是我的代码:
- (void)viewDidLoad
{
[super viewDidLoad];
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(orientationChanged:)name:@"UIDeviceOrientationDidChangeNotification"
object:nil];
[self performSelector:@selector (ritardo) withObject:nil afterDelay:5.0f];
}
-(void)orientationChanged:(NSNotification *)object{
UIDeviceOrientation deviceOrientation = [[object object] orientation];
if (deviceOrientation == UIInterfaceOrientationPortrait)
{
[UIView beginAnimations:@"View Flip" context:nil];
[UIView setAnimationDuration:0.5f];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
self.view = self.portraitView;
}
else if (deviceOrientation == UIInterfaceOrientationLandscapeLeft || deviceOrientation
== UIInterfaceOrientationLandscapeRight)
{
[UIView beginAnimations:@"View Flip" context:nil];
[UIView setAnimationDuration:0.5f];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
self.view = self.landscapeView;
}
[UIView commitAnimations];
[self dismissModalViewControllerAnimated:NO];
}
-(void) ritardo {
ruota.image = [UIImage imageNamed:@"RuotaPerAiuto.png"];
}
- (void)viewDidUnload
{
[self setPortraitView:nil];
[self setLandscapeView:nil];
[self setRuota:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:
(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
} else {
return YES;
}
}
@end
嗨,希望你能帮助我
编辑:我以这种方式修改了-(void)orientationChanged:(NSNotification *)object {:
-(void)orientationChanged:(NSNotification *)object{
UIDeviceOrientation deviceOrientation = [[object object] orientation];
if (deviceOrientation == UIDeviceOrientationFaceUp)// || deviceOrientation ==
UIDeviceOrientationFaceDown)
{
return;
}
if (deviceOrientation == UIInterfaceOrientationPortrait || deviceOrientation ==
UIInterfaceOrientationPortraitUpsideDown)
{
[UIView beginAnimations:@"View Flip" context:nil];
[UIView setAnimationDuration:0.5f];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
self.view = self.portraitView;
}
else
if (deviceOrientation == UIInterfaceOrientationLandscapeLeft || deviceOrientation ==
UIInterfaceOrientationLandscapeRight)
{
[UIView beginAnimations:@"View Flip" context:nil];
[UIView setAnimationDuration:0.5f];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
self.view = self.landscapeView;
}
[UIView commitAnimations];
[self dismissModalViewControllerAnimated:NO];
}
现在,如果我是人像并将iPhone置于faceUp位置,则效果很好。 但是当我将位置从faceUp更改为portrait时,它又回到了家中...
问题在于UIDeviceOrientationDidChangeNotification
将独立于shouldAutorotateToInterfaceOrientation
触发。 而你不处理的情况下UIInterfaceOrientationPortraitUpsideDown
, UIDeviceOrientationFaceUp
和UIDeviceOrientationFaceDown
的方法orientationChanged:
因此,将设备旋转到这些方向之一时,您的代码等效于:
-(void)orientationChanged:(NSNotification *)object
{
[UIView commitAnimations];
[self dismissModalViewControllerAnimated:NO];
}
因此,您应该删除以下行:
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChanged:)name:@"UIDeviceOrientationDidChangeNotification" object:nil];
并将代码放在willRotateToInterfaceOrientation
方法中:
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation duration:(NSTimeInterval)duration
{
[UIView beginAnimations:@"View Flip" context:nil];
[UIView setAnimationDuration:0.5f];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
if (UIInterfaceOrientationIsPortrait(interfaceOrientation)) {
self.view = self.portraitView;
} else {
self.view = self.landscapeView;
}
[UIView commitAnimations];
[self dismissModalViewControllerAnimated:NO];
}
编辑
如果要保留orientationChanged
,请按如下所示进行修改:
-(void)orientationChanged:(NSNotification *)object{
UIDeviceOrientation deviceOrientation = [[object object] orientation];
if (deviceOrientation == UIInterfaceOrientationPortrait) {
[UIView beginAnimations:@"View Flip" context:nil];
[UIView setAnimationDuration:0.5f];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
self.view = self.portraitView;
[UIView commitAnimations];
[self dismissModalViewControllerAnimated:NO];
} else if (deviceOrientation == UIInterfaceOrientationLandscapeLeft || deviceOrientation == UIInterfaceOrientationLandscapeRight) {
[UIView beginAnimations:@"View Flip" context:nil];
[UIView setAnimationDuration:0.5f];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
self.view = self.landscapeView;
[UIView commitAnimations];
[self dismissModalViewControllerAnimated:NO];
}
}
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