IOS UIDevice & IOS檢測屏幕旋轉實例

UIDevice類提供了一個單例實例代表當前的設備。從這個實例中可以獲得的信息設備，比如操作系統名稱、電池電量值(batteryLevel)、電池狀態(batteryState)、設備的類型(model，比如iPod、iPhone等)、設備的系統(systemVersion)
屏幕的旋轉朝向可以通過  [[UIDevice currentDevice]orientation] 判斷，orientation是個Integer類型，每個值表示相應的朝向，必須在調用beginGeneratingDeviceOrientationNotifications方法后，此orientation屬性才有效，否則一直是0。

//
//  ViewController.m
//

#import "ViewController.h"

@interface ViewController ()
/**
 *  UIImageView
 */
@property(nonatomic,strong)UIImageView *imageView;


@end


@implementation ViewController


- (void)handleDeviceOrientationDidChange:(UIInterfaceOrientation)interfaceOrientation
{
    //1.獲取 當前設備 實例
    UIDevice *device = [UIDevice currentDevice] ;




    /**
     *  2.取得當前Device的方向，Device的方向類型為Integer
     *
     *  必須調用beginGeneratingDeviceOrientationNotifications方法后，此orientation屬性才有效，否則一直是0。orientation用于判斷設備的朝向，與應用UI方向無關
     *
     *  @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(@"屏幕向左橫置");
            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(@"無法辨識");
            break;
    }

}


- (void)viewDidLoad {


    //設備名稱  e.g. "My iPhone"
    NSString *strName = [[UIDevice currentDevice] name];
    NSLog(@"設備名稱：%@", strName);



    /**
     * 系統名稱 e.g. @"iOS"
     */
    NSString *strSysName = [[UIDevice currentDevice] systemName];
    NSLog(@"系統名稱：%@", strSysName);



    /**
     * 系統版本號 e.g. @"4.0"
     */
    NSString *strSysVersion = [[UIDevice currentDevice] systemVersion];
    NSLog(@"系統版本號：%@", strSysVersion);




    /**
     * 設備類型 e.g. @"iPhone", @"iPod touch"
     */
    NSString *strModel = [[UIDevice currentDevice] model];
    NSLog(@"設備類型：%@", strModel);



    /**
     * 本地設備模式 localized version of model
     */
    NSString *strLocModel = [[UIDevice currentDevice] localizedModel];
    NSLog(@"本地設備模式：%@", strLocModel);




    /**
     * UUID 　可用于唯一地標識該設備
     */
    NSUUID *identifierForVendor = [[UIDevice currentDevice] identifierForVendor];
    NSLog(@"UUID：%@", identifierForVendor.UUIDString);



    /**
     * UIImage 對象
     */
    UIImage *image = [UIImage imageNamed:@"scroll.jpg"];
    self.imageView.image = image;

    // 設置圖片范圍
    CGFloat imageH = image.size.height;
    CGFloat imageW = image.size.width;
    CGFloat imageX = 0;
    CGFloat imageY = 0;
    self.imageView.frame = CGRectMake(imageX, imageY, imageW, imageH);
    [self.view addSubview:self.imageView];

    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}


-(void)viewDidAppear:(BOOL)animated
{

    /**
     *  開始生成 設備旋轉 通知
     */
    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];


    /**
     *  添加 設備旋轉 通知
     *
     *  @param handleDeviceOrientationDidChange: handleDeviceOrientationDidChange: description
     *
     *  @return return value description
     */
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(handleDeviceOrientationDidChange:)
                                                 name:UIDeviceOrientationDidChangeNotification
                                               object:nil
     ];



}



-(void)viewDidDisappear:(BOOL)animated
{



    /**
     *  銷毀 設備旋轉 通知
     *
     *  @return return value description
     */
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:UIDeviceOrientationDidChangeNotification
                                                  object:nil
     ];


    /**
     *  結束 設備旋轉通知
     *
     *  @return return value description
     */
    [[UIDevice currentDevice]endGeneratingDeviceOrientationNotifications];

}



- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}




#pragma 懶加載

- (UIImageView *)imageView
{
    if (!_imageView) {
        _imageView = [[UIImageView alloc] init];
    }
    return _imageView;
}

@end