IOS横竖屏控制与事件处理

转载

mob604756f89f2f 2016-04-11 10:03:00

公司App里面有个需求，即所有界面都是竖屏，且不允许横屏切换，唯独有一个图表界面允许横屏。那么，根据此需求处理如下：

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：

1 @implementation AppExtendNavigationController
 2 - (void)viewDidLoad {
 3 [super viewDidLoad];
 4 // Do any additional setup after loading the view.
 5 }
 6 - (void)didReceiveMemoryWarning {
 7 [super didReceiveMemoryWarning];
 8 // Dispose of any resources that can be recreated.
 9 }
10 #pragma mark 转屏方法重写
11 -(UIInterfaceOrientationMask)supportedInterfaceOrientations
12 {
13 return [self.viewControllers.lastObject supportedInterfaceOrientations];
14 }
15 -(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
16 {
17 return [self.viewControllers.lastObject preferredInterfaceOrientationForPresentation];
18 }
19 -(BOOL)shouldAutorotate{
20 return self.visibleViewController.shouldAutorotate;
21 }

最后，在你不想转屏切换的ViewController上重写以下方法：

1 #pragma mark 转屏方法 不允许转屏
 2 -(UIInterfaceOrientationMask)supportedInterfaceOrientations
 3 {
 4 return UIInterfaceOrientationMaskPortrait ;
 5 }
 6 - (BOOL)shouldAutorotate
 7 {
 8 return NO;
 9 }
10 -(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
11 {
12 return UIInterfaceOrientationPortrait;
13 }
14 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{
15 return NO;
16 }

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）：

1 - (BOOL)shouldAutorotate {
 2 return YES;
 3 }
 4 -(UIInterfaceOrientationMask)supportedInterfaceOrientations
 5 {
 6 return UIInterfaceOrientationMaskAll;
 7 }
 8 - (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
 9 {
10 return UIInterfaceOrientationPortrait;
11 }
12 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
13 {
14 return YES;
15 }

另外，在ViewController中对于转屏事件可以参见下面的方法进行捕获：

1 - (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
 2 {
 3 [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
 4 [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {
 5 //计算旋转之后的宽度并赋值
 6 CGSize screen = [UIScreen mainScreen].bounds.size;
 7 //界面处理逻辑
 8 self.lineChartView.frame = CGRectMake(0, 30, screen.width, 200.0);
 9 //动画播放完成之后
10 if(screen.width > screen.height){
11 NSLog(@"横屏");
12 }else{
13 NSLog(@"竖屏");
14 }
15 } completion:^(id<UIViewControllerTransitionCoordinatorContext> context) {
16 NSLog(@"动画播放完之后处理");
17 }];
18 }