强迫方向改变有时不起作用

Question

在我的应用程序中按下某个按钮时,视图应该从纵向更改为横向.当用户返回时,视图控制器应该更改回肖像.但有时方向不会改变或使用错误的视图框架.

这是我的代码

-(void)btnSignClicked:(CustomSignButton *)btn {
    isSignButtonClicked = true;
    if (NSFoundationVersionNumber > NSFoundationVersionNumber_iOS_7_0) {
        NSNumber *value = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeRight];
        [[UIDevice currentDevice] setValue:value forKey:@"orientation"];
    }
    else
    {
        [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight animated:YES];
    }
    selectedWaiverId = btn.customTag;

    SignatureView *obj = [[SignatureView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height) delegate:self]; // Most of time got size (568,320) but some time i got (320,568), Don't know why
    [self.view addSubview:obj];
}

#pragma mark - SIGNATUREVIEW DELEGATE
-(void)removeSignatureView:(SignatureView *)signatureView {
    isSignButtonClicked = false;

    if (NSFoundationVersionNumber > NSFoundationVersionNumber_iOS_7_0)
    {
        NSNumber *value = [NSNumber numberWithInt:UIInterfaceOrientationPortrait];
        [[UIDevice currentDevice] setValue:value forKey:@"orientation"]; // Some time not changed the orientation are view remaining in landscape 
    }
    else
    {
        [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationPortrait animated:YES];
    }

    [signatureView removeFromSuperview];
    signatureView = nil;

}
#pragma mark
#pragma mark - Rotate screen
-(UIInterfaceOrientationMask)supportedInterfaceOrientations
{
    if (isSignButtonClicked == true)
    {
        return UIInterfaceOrientationMaskLandscapeRight|UIInterfaceOrientationMaskLandscape;
    }
    else
    {
        return UIInterfaceOrientationMaskPortrait;
    }
}
- (BOOL)shouldAutorotate
{
    return YES;
}
-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    if (isSignButtonClicked == true)
    {
        return (interfaceOrientation == UIInterfaceOrientationLandscapeRight);
    }
    else
    {
        return (interfaceOrientation == UIInterfaceOrientationPortrait);
    }

}

UPDATE

有时viewWillTransitionToSize方法不会调用,所以我也整合了这个通知

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(deviceOrientationDidChange:) name:UIDeviceOrientationDidChangeNotification object:nil];
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

但有时这也行不通.

Answer 1

请参阅此链接，特别是，我认为您应该检查视图控制器的条件，确保它们符合 Apple 建议

例如检查最顶层全屏视图控制器的supportedInterfaceOrientations方法