iOS

iOS横竖屏控制和事件处理

又一篇

Posted by Alpaca on April 11, 2016

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:

@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:

#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):

- (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:

- (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



分享文章到微博:
对您有点帮助? 您的支持将鼓励我继续创作!