首先，确保App本身应该允许转屏切换：
再次，我的App里面都是走UINavigationController进行界面push切换的，所以首先创建一个UINavigationController的子类，并设定允许转屏：
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@implementation AppExtendNavigationController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark 转屏方法重写
-(UIInterfaceOrientationMask)supportedInterfaceOrientations
{
return [self.viewControllers.lastObject supportedInterfaceOrientations];
}
-(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
return [self.viewControllers.lastObject preferredInterfaceOrientationForPresentation];
}
-(BOOL)shouldAutorotate{
return self.visibleViewController.shouldAutorotate;
}
最后，在你不想转屏切换的ViewController上重写以下方法：
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#pragma mark 转屏方法 不允许转屏
-(UIInterfaceOrientationMask)supportedInterfaceOrientations
{
return UIInterfaceOrientationMaskPortrait ;
}
- (BOOL)shouldAutorotate
{
return NO;
}
-(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
return UIInterfaceOrientationPortrait;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{
return NO;
}
在你想转屏切换的ViewController上可以照这样重写（允许左右横屏以及竖屏）：
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- (BOOL)shouldAutorotate {
return YES;
}
-(UIInterfaceOrientationMask)supportedInterfaceOrientations
{
return UIInterfaceOrientationMaskAll;
}
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
return UIInterfaceOrientationPortrait;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}
另外，在ViewController中对于转屏事件可以参见下面的方法进行捕获：
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- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
[super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
[coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {
//计算旋转之后的宽度并赋值
CGSize screen = [UIScreen mainScreen].bounds.size;
//界面处理逻辑
self.lineChartView.frame = CGRectMake(0, 30, screen.width, 200.0);
//动画播放完成之后
if(screen.width > screen.height){
NSLog(@"横屏");
}else{
NSLog(@"竖屏");
}
} completion:^(id<UIViewControllerTransitionCoordinatorContext> context) {
NSLog(@"动画播放完之后处理");
}];
}
区分当前屏幕是否为横竖屏的状态，其实通过判断当前屏幕的宽高来决定是不是横屏或者竖屏：
竖屏时：宽<高
横屏时：宽>高
以上在IOS8、9中测试通过
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