appdelegate.h实现

@property(nonatomic, assign) BOOL allowLandscape; //允许横竖屏yes为横屏no为竖屏

appdelegate.m实现

 -(UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
 {
if (self.allowLandscape == 1) {
    return UIInterfaceOrientationMaskAll;
}else{
    return (UIInterfaceOrientationMaskPortrait);
}
}

vc.m实现

 - (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
//在视图出现的时候，将allowRotate改为1，
AppDelegate * delegate = (AppDelegate *) [UIApplication sharedApplication].delegate;
delegate.allowLandscape = 1;
}
    - (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
//在视图出现的时候，将allowRotate改为0，
AppDelegate * delegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
delegate.allowLandscape = 0;
if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {
    SEL selector = NSSelectorFromString(@"setOrientation:");
    NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
    [invocation setSelector:selector];
    [invocation setTarget:[UIDevice currentDevice]];
    int val = UIInterfaceOrientationPortrait;
    [invocation setArgument:&val atIndex:2];
    [invocation invoke];
}
}
 - (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
 {
// do something before rotation
if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft || toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) {
    //屏幕从竖屏变为横屏时执行
    
    NSLog(@"屏幕从竖屏变为横屏时执行");
}else{
    //屏幕从横屏变为竖屏时执行
    NSLog(@"/屏幕从横屏变为竖屏时执行");
    
  }
}

按钮实现

横屏

  [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight];
      self.view.transform = CGAffineTransformMakeRotation(M_PI_2);
      self.view.bounds = CGRectMake(0, 0, KSCREEN_HEIGHT, KSCREEN_WIDTH);

竖屏

 [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationPortrait];
      self.view.transform = CGAffineTransformMakeRotation(0);
      self.view.bounds = CGRectMake(0, 0, KSCREEN_WIDTH, KSCREEN_HEIGHT);