OC屏幕旋转相关

OC屏幕旋转分为两个部分来说，第一个是开启了Device Orientation，开启了的话，自己旋转，没开启需要自己手动处理。因为现在大多数都是用自动布局，这个一般用不到，最近在看AVFoundation相关的东西，需要用到这个，所以总结下

 第一部分，开启了自动旋转：

• (1)注册屏幕旋转通知：

 [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
    //注册屏幕旋转通知
 [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(orientChange:)
                                                 name:UIDeviceOrientationDidChangeNotification
                                               object:[UIDevice currentDevice]];

- (void)orientChange:(NSNotification *)notification{
    UIDeviceOrientation orientation = [UIDevice currentDevice].orientation;
    if(orientation == UIDeviceOrientationPortrait){
         NSLog(@"home在下方");
        self.deviceOrientationBtn.selected = NO;
    }else if(orientation == UIDeviceOrientationPortraitUpsideDown){
         NSLog(@"home在上方");
        self.deviceOrientationBtn.selected = NO;
    }else if(orientation == UIDeviceOrientationLandscapeLeft){
         NSLog(@"home在右方");
        self.deviceOrientationBtn.selected = YES;
    }else if(orientation == UIDeviceOrientationLandscapeRight){
         NSLog(@"home在左方");
        self.deviceOrientationBtn.selected = YES;
    }

}

 如果开启了之后我想手动横屏或者竖屏的话，也可以使用代码强制实现：

[[UIDevice currentDevice] setValue:[NSNumber numberWithInteger:UIInterfaceOrientationLandscapeRight]

 or

 [[UIDevice currentDevice] setValue:[NSNumber numberWithInteger:UIDeviceOrientationPortrait] forKey:@"orientation"]

 如果想进入改ViewController就横屏或者竖屏，退出之后恢复的话，可以在

-(void)viewWillAppear:(BOOL)animated

 and

-(void)viewWillDisappear:(BOOL)animated:

 两个方法中实现通知注册了之后dealloc别忘记内存处理

-(void)dealloc{
    [[NSNotificationCenter defaultCenter]removeObserver:self];
}

第二部分，没有开启屏幕旋转，需要自己手动做一个假的来代替

（1）横屏设置的方法：

- (void)fullScreenWithDirection:(UIInterfaceOrientation)direction{
    if (direction == UIInterfaceOrientationLandscapeLeft){
        [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight animated:YES];
        [UIView animateWithDuration:0.25 animations:^{
            self.view.transform = CGAffineTransformMakeRotation(M_PI / 2);
        }completion:^(BOOL finished) {
//            [self setFullStatusBarHiddenType:_fullStatusBarHiddenType];
        }];
    }else if (direction == UIInterfaceOrientationLandscapeRight) {
        [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeLeft animated:YES];
        [UIView animateWithDuration:0.25 animations:^{
            self.view.transform = CGAffineTransformMakeRotation(0);
        }completion:^(BOOL finished) {
//            [self setFullStatusBarHiddenType:_fullStatusBarHiddenType];
        }];
    }
    self.view.frame = [[UIApplication sharedApplication]keyWindow].bounds;
    [self.view setNeedsLayout];
    [self.view layoutIfNeeded];
    
}

（2）竖屏还原

[UIView animateWithDuration:0.25 animations:^{
            self.view.transform = CGAffineTransformMakeRotation(0);
            self.view.frame = [[UIApplication sharedApplication]keyWindow].bounds;
            [self.view setNeedsLayout];
            [self.view layoutIfNeeded];
        }completion:^(BOOL finished) {
        }];