IOS UIDevice & IOS检测屏幕旋转实例

摘要: 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