IOS UIDevice & IOS检测屏幕旋转实例

一 UIDevice 简介

UIDevice类提供了一个单例实例代表当前的设备。从这个实例中可以获得的信息设备，比如操作系统名称、电池电量值(batteryLevel)、电池状态(batteryState)、设备的类型(model，比如iPod、iPhone等)、设备的系统(systemVersion)

二 获取 UIDevice 实例

通过[UIDevice currentDevice]可以获取这个单粒对象

UIDevice *device = [UIDevice currentDevice];

三 UIDevice 常用属性

通过UIDevice相关属性，可用获取设备信息

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

    
    
    /**
     * 系统名称 e.g. @"iOS"
     */
    NSString *strSysName = [[UIDevice currentDevice] systemName];
    NSLog(@"系统名称：%@", strSysName);
    
    

    /**
     * 系统版本号 e.g. @"4.0"
     */
    NSString *strSysVersion = [[UIDevice currentDevice] systemVersion];
    NSLog(@"系统版本号：%@", strSysVersion);
    
    
    
    /**
     * 设备类型 e.g. @"iPhone", @"iPod touch"
     */
    NSString *strModel = [[UIDevice currentDevice] model];
    NSLog(@"设备类型：%@", strModel);
    
    
    
    /**
     * 本地设备模式 localized version of model
     */
    NSString *strLocModel = [[UIDevice currentDevice] localizedModel];
    NSLog(@"本地设备模式：%@", strLocModel);
    

    
    /**
     * UUID 　可用于唯一地标识该设备
     */
    NSUUID *identifierForVendor = [[UIDevice currentDevice] identifierForVendor];
    NSLog(@"strIdentifierForVendor：%@", identifierForVendor.UUIDString);

四 UIDevice 通知

UIDevice对象会不间断地发布一些通知，下列是UIDevice对象所发布通知的名称常量：

4.1 设备旋转

UIDeviceOrientationDidChangeNotification

4.2 电池状态改变

UIDeviceBatteryStateDidChangeNotification

4.3 电池电量改变

UIDeviceBatteryLevelDidChangeNotification

4.4 近距离传感器(比如设备贴近了使用者的脸部)

UIDeviceProximityStateDidChangeNotification

五 IOS检测屏幕旋转 UIDeviceOrientationDidChangeNotification 使用举例（其他通知方式类推）

屏幕的旋转朝向可以通过  [[UIDevice currentDevice]orientation] 判断，orientation是个Integer类型，每个值表示相应的朝向，必须在调用beginGeneratingDeviceOrientationNotifications方法后，此orientation属性才有效，否则一直是0。

   orientation 对应的枚举值

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
};

5.1 注册通知

    /**
     *  开始生成 设备旋转 通知
     */
    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
    
    
    /**
     *  添加 设备旋转 通知
     *  
     *  当监听到 UIDeviceOrientationDidChangeNotification 通知时，调用handleDeviceOrientationDidChange:方法
     *  @param handleDeviceOrientationDidChange: handleDeviceOrientationDidChange: description
     *
     *  @return return value description
     */
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(handleDeviceOrientationDidChange:)
                                                 name:UIDeviceOrientationDidChangeNotification
                                               object:nil
     ];

5.2 销毁通知

  
    /**
     *  销毁 设备旋转 通知
     *
     *  @return return value description
     */
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:UIDeviceOrientationDidChangeNotification
                                                  object:nil
     ];
    
    
    /**
     *  结束 设备旋转通知
     *
     *  @return return value description
     */
    [[UIDevice currentDevice]endGeneratingDeviceOrientationNotifications];

5.3 旋转识别

- (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;
    }

}

5.4 结果演示

   输出 "屏幕向左横置"

5.5 完整代码

//
//  ViewController.m
//

#import "ViewController.h"

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


@end


@implementation ViewController


- (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)viewDidLoad {

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

    
    
    /**
     * 系统名称 e.g. @"iOS"
     */
    NSString *strSysName = [[UIDevice currentDevice] systemName];
    NSLog(@"系统名称：%@", strSysName);
    
    

    /**
     * 系统版本号 e.g. @"4.0"
     */
    NSString *strSysVersion = [[UIDevice currentDevice] systemVersion];
    NSLog(@"系统版本号：%@", strSysVersion);
    
    
    
    
    /**
     * 设备类型 e.g. @"iPhone", @"iPod touch"
     */
    NSString *strModel = [[UIDevice currentDevice] model];
    NSLog(@"设备类型：%@", strModel);
    
    
    
    /**
     * 本地设备模式 localized version of model
     */
    NSString *strLocModel = [[UIDevice currentDevice] localizedModel];
    NSLog(@"本地设备模式：%@", strLocModel);
    

    
    
    /**
     * UUID 　可用于唯一地标识该设备
     */
    NSUUID *identifierForVendor = [[UIDevice currentDevice] identifierForVendor];
    NSLog(@"UUID：%@", identifierForVendor.UUIDString);
    
    
    
    /**
     * UIImage 对象
     */
    UIImage *image = [UIImage imageNamed:@"scroll.jpg"];
    self.imageView.image = image;
    
    // 设置图片范围
    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
{
    
    /**
     *  开始生成 设备旋转 通知
     */
    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
    
    
    /**
     *  添加 设备旋转 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
{
    
    
    
    /**
     *  销毁 设备旋转 通知
     *
     *  @return return value description
     */
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:UIDeviceOrientationDidChangeNotification
                                                  object:nil
     ];
    
    
    /**
     *  结束 设备旋转通知
     *
     *  @return return value description
     */
    [[UIDevice currentDevice]endGeneratingDeviceOrientationNotifications];
    
}



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




#pragma 懒加载

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

@end