IOS學習之 響應設備的橫豎屏狀態，旋轉界面 達到橫豎屏效果

監聽 UIDeviceOrientationDidChangeNotification的廣播，再根據[[UIDevice currentDevice] orientation]獲取到屏幕的方向。

-(void) viewDidLoad {
     // Request to turn on accelerometer and begin receiving accelerometer events
     [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChanged:) name:UIDeviceOrientationDidChangeNotification object:nil];
}
 
- (void)orientationChanged:(NSNotification *)notification {
     // 獲取當前屏幕方向interfaceOrientation
    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
    if (orientation == UIDeviceOrientationLandscapeLeft) {// 左橫屏
        [self allPlay];
    } else {// 其他的都是正豎屏
        [self normalPlay];
    }
}
 
-(void) viewDidDisappear {
     // Request to stop receiving accelerometer events and turn off accelerometer
     [[NSNotificationCenter defaultCenter] removeObserver:self];
     [[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];
}
- (void) allPlay {
    // 按鈕
    [self.allScreenPlayBtn setHidden:YES];
    [self.normalPlayBtn setHidden:NO];
    // 狀態欄
    isStatusBaeHidden = YES;
    [self prefersStatusBarHidden];    // 是否隱藏狀態欄
    // 導航欄
    [self.navigationController setNavigationBarHidden:YES animated:YES];
    // view旋轉
    [UIView beginAnimations:@"rotate" context:nil];
    [UIView setAnimationDuration:0.6f];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    self.cbPlayer.view.transform = CGAffineTransformRotate(self.view.transform, M_PI_2);
    self.normalPlayBtn.transform = CGAffineTransformRotate(self.normalPlayBtn.transform, M_PI_2);
    [UIView commitAnimations];
    
    CGSize size = [[UIScreen mainScreen] bounds].size;
    CGRect rect = CGRectMake(0, -20, size.width, size.height);
    [self.cbPlayer.view setFrame:rect];
}
- (void) normalPlay {
    // 按鈕
    [self.allScreenPlayBtn setHidden:NO];
    [self.normalPlayBtn setHidden:YES];
    // 狀態欄
    isStatusBaeHidden = NO;
    [self prefersStatusBarHidden];
    // 導航欄
    [self.navigationController setNavigationBarHidden:NO animated:YES];
    // view旋轉
    [UIView beginAnimations:@"rotate" context:nil];
    [UIView setAnimationDuration:0.6f];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    self.cbPlayer.view.transform = CGAffineTransformRotate(self.view.transform, 0);
    self.normalPlayBtn.transform = CGAffineTransformRotate(self.normalPlayBtn.transform, 0);
    [UIView commitAnimations];
    [self.cbPlayer.view setFrame:self.playView.frame];
}