首先，确保APP支持屏幕旋转，具体怎么支持，去网上查询一下
然后，在对应的类中进行如下操作
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的ViewController上重写以下方法：
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;
}
在你想转屏切换的的ViewController上可以照这样重写（允许左右横屏以及竖屏）：
(BOOL)shouldAutorotate {
return YES;
}
-(UIInterfaceOrientationMask)supportedInterfaceOrientations {
return UIInterfaceOrientationMaskAll;
}(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
return UIInterfaceOrientationPortrait;
}(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES;
}
另外，在的ViewController中对于转屏事件可以参见下面的方法进行捕获：-
(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
