iOS检测屏幕旋转

iOS设备方向监听与处理

最新推荐文章于 2022-02-17 19:59:04 发布

weixin_33881050

最新推荐文章于 2022-02-17 19:59:04 发布

阅读量142

点赞数

CC 4.0 BY-SA版权

文章标签： python ui

原文链接：https://my.oschina.net/u/2519763/blog/3009706

本文详细介绍了在iOS开发中如何使用UIDevice监听设备的方向变化，并通过实例代码展示了如何根据不同设备方向进行相应的处理。了解了如何开始和结束设备方向通知，以及如何在dealloc方法中移除观察者。

2019独角兽企业重金招聘Python工程师标准>>>

typedef NS_ENUM(NSInteger, UIDeviceOrientation) {
    UIDeviceOrientationUnknown,
    UIDeviceOrientationPortrait,            // Device oriented vertically, home button on the bottom
    UIDeviceOrientationPortraitUpsideDown,  // Device oriented vertically, home button on the top
    UIDeviceOrientationLandscapeLeft,       // Device oriented horizontally, home button on the right
    UIDeviceOrientationLandscapeRight,      // Device oriented horizontally, home button on the left
    UIDeviceOrientationFaceUp,              // Device oriented flat, face up
    UIDeviceOrientationFaceDown             // Device oriented flat, face down
} __TVOS_PROHIBITED;

具体实现如下

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    

    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(handleDeviceOrientationDidChange:)
                                                 name:UIDeviceOrientationDidChangeNotification
                                               object:nil
     ];
    
}

- (void)handleDeviceOrientationDidChange:(UIInterfaceOrientation)interfaceOrientation
{
    //1.获取 当前设备 实例
    UIDevice *device = [UIDevice currentDevice] ;
    
    
    
    
    /**
     *  2.取得当前Device的方向，Device的方向类型为Integer
     *
     *  必须调用beginGeneratingDeviceOrientationNotifications方法后，此orientation属性才有效，否则一直是0。orientation用于判断设备的朝向，与应用UI方向无关
     *
     *  @param device.orientation
     *
     */
    
    switch (device.orientation) {
        case UIDeviceOrientationFaceUp:
            NSLog(@"屏幕朝上平躺");
            break;
            
        case UIDeviceOrientationFaceDown:
            NSLog(@"屏幕朝下平躺");
            break;
            
            //系統無法判斷目前Device的方向，有可能是斜置
        case UIDeviceOrientationUnknown:
            NSLog(@"未知方向");
            break;
            
        case UIDeviceOrientationLandscapeLeft:
            NSLog(@"屏幕向左横置");
            break;
            
        case UIDeviceOrientationLandscapeRight:
            NSLog(@"屏幕向右橫置");
            break;
            
        case UIDeviceOrientationPortrait:
            NSLog(@"屏幕直立");
            break;
            
        case UIDeviceOrientationPortraitUpsideDown:
            NSLog(@"屏幕直立，上下顛倒");
            break;
            
        default:
            NSLog(@"无法辨识");
            break;
    }
    
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:UIDeviceOrientationDidChangeNotification
                                                  object:nil
     ];
    
    [[UIDevice currentDevice]endGeneratingDeviceOrientationNotifications];
}

转载于:https://my.oschina.net/u/2519763/blog/3009706