强制横屏的一种实现 ios

// 强制横屏的一种实现
// 使用方法：
// 在vc的init方法中调用initLogic
// 在vc关闭之前调用cleanRotateTrace方法

-(void)initLogic
{
   isPortraitIn_ = NO;
   isSettingStatusBar_ = NO;
}
-(BOOL)shouldAutorotate
{
   if (isSettingStatusBar_)
   {
       return NO;
   }
   return YES;
}

-(NSUInteger)supportedInterfaceOrientations
{
   return UIInterfaceOrientationMaskLandscape;
}

-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
   return ((toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft)||(toInterfaceOrientation == UIInterfaceOrientationLandscapeRight));
}

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientationduration:(NSTimeInterval)duration
{
   if (isPortraitIn_)
   {
       self.view.transform = CGAffineTransformIdentity;
       isPortraitIn_ = NO;
   }
}

- (void)cleanRotationTrace
{
   if (isPortraitIn_)
   {
       self.view.transform = CGAffineTransformIdentity;
       isPortraitIn_ = NO;
       UIInterfaceOrientation orientation = [UIApplicationsharedApplication].statusBarOrientation;
       if (orientation == UIInterfaceOrientationLandscapeRight)
       {
           isSettingStatusBar_ = YES;
           [[UIApplication sharedApplication]setStatusBarOrientation:UIInterfaceOrientationPortrait animated:NO];
           isSettingStatusBar_ = NO;
       }
       else
       {
           isSettingStatusBar_ = YES;
           [[UIApplication sharedApplication]setStatusBarOrientation:UIInterfaceOrientationPortraitUpsideDown animated:NO];
           isSettingStatusBar_ = NO;
       }
       [self.view setFrame:CGRectMake(0, 0, self.view.frame.size.height + 20,self.view.frame.size.width - 20)];
   }
}

-(void)viewDidAppear:(BOOL)animated
{
   [super viewDidAppear:animated];
   UIInterfaceOrientation orientation = [UIApplicationsharedApplication].statusBarOrientation;
   if (UIInterfaceOrientationIsPortrait(orientation))
   {
       isPortraitIn_ = YES;
       self.view.transform = CGAffineTransformMakeRotation(M_PI_2);
       if (orientation == UIInterfaceOrientationPortrait)
       {
           isSettingStatusBar_ = YES;
           [[UIApplication sharedApplication]setStatusBarOrientation:UIInterfaceOrientationLandscapeRight animated:NO];
           isSettingStatusBar_ = NO;
       }
       else
       {
           isSettingStatusBar_ = YES;
           [[UIApplication sharedApplication]setStatusBarOrientation:UIInterfaceOrientationLandscapeLeft animated:NO];
           isSettingStatusBar_ = NO;
       }
       [self.view setFrame:CGRectMake(0, -20, self.view.frame.size.height - 20,self.view.frame.size.width + 20)];
   }
}