程式碼處理 iOS 的橫豎屏旋轉

發表於2017-07-14

一、監聽螢幕旋轉方向

在處理iOS橫豎屏時，經常會和UIDeviceOrientation、UIInterfaceOrientation和UIInterfaceOrientationMask這三個列舉型別打交道，它們從不同角度描述了螢幕旋轉方向。

1、UIDeviceOrientation：裝置方向

iOS的裝置方向是通過iOS的加速計來獲取的。

1）iOS定義了以下七種裝置方向

typedef NS_ENUM(NSInteger, UIDeviceOrientation) {
    UIDeviceOrientationUnknown,                 // 未知方向，可能是裝置(螢幕)斜置
    UIDeviceOrientationPortrait,                // 裝置(螢幕)直立
    UIDeviceOrientationPortraitUpsideDown,      // 裝置(螢幕)直立，上下顛倒
    UIDeviceOrientationLandscapeLeft,           // 裝置(螢幕)向左橫置
    UIDeviceOrientationLandscapeRight,          // 裝置(螢幕)向右橫置
    UIDeviceOrientationFaceUp,                  // 裝置(螢幕)朝上平躺
    UIDeviceOrientationFaceDown                 // 裝置(螢幕)朝下平躺
};

typedef NS_ENUM(NSInteger, UIDeviceOrientation) {

UIDeviceOrientationUnknown, // 未知方向，可能是裝置(螢幕)斜置

UIDeviceOrientationPortrait, // 裝置(螢幕)直立

UIDeviceOrientationPortraitUpsideDown, // 裝置(螢幕)直立，上下顛倒

UIDeviceOrientationLandscapeLeft, // 裝置(螢幕)向左橫置

UIDeviceOrientationLandscapeRight, // 裝置(螢幕)向右橫置

UIDeviceOrientationFaceUp, // 裝置(螢幕)朝上平躺

UIDeviceOrientationFaceDown // 裝置(螢幕)朝下平躺

};

說明：UIDeviceOrientation參考home鍵方向，如：home方向在右，裝置(螢幕)方向向左（UIDeviceOrientationLandscapeLeft）

2）讀取裝置方向

UIDevice單例代表當前的裝置。從這個單例中可以獲得的資訊裝置，如裝置方向orientation。

UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;

1	UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;

3）監聽、處理和移除裝置方向改變的通知

當裝置方向變化時候，發出UIDeviceOrientationDidChangeNotification通知；註冊監聽該通知，可以針對不同的裝置方向處理檢視展示。

//開啟和監聽 裝置旋轉的通知（不開啟的話，裝置方向一直是UIInterfaceOrientationUnknown）
if (![UIDevice currentDevice].generatesDeviceOrientationNotifications) {
    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
}
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(handleDeviceOrientationChange:) 
                                     name:UIDeviceOrientationDidChangeNotification object:nil];


//裝置方向改變的處理
- (void)handleDeviceOrientationChange:(NSNotification *)notification{

    UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
    switch (ddeviceOrientation) {
        case UIDeviceOrientationFaceUp:
            NSLog(@"螢幕朝上平躺");
            break;

        case UIDeviceOrientationFaceDown:
            NSLog(@"螢幕朝下平躺");
            break;

        case UIDeviceOrientationUnknown:
            NSLog(@"未知方向");
            break;

        case UIDeviceOrientationLandscapeLeft:
            NSLog(@"螢幕向左橫置");
            break;

        case UIDeviceOrientationLandscapeRight:
            NSLog(@"螢幕向右橫置");
            break;

        case UIDeviceOrientationPortrait:
            NSLog(@"螢幕直立");
            break;

        case UIDeviceOrientationPortraitUpsideDown:
            NSLog(@"螢幕直立，上下顛倒");
            break;

        default:
            NSLog(@"無法辨識");
            break;
    }
}

//最後在dealloc中移除通知 和結束裝置旋轉的通知
- (void)dealloc{
    //...
    [[NSNotificationCenter defaultCenter]removeObserver:self];
    [[UIDevice currentDevice]endGeneratingDeviceOrientationNotifications];

//開啟和監聽裝置旋轉的通知（不開啟的話，裝置方向一直是UIInterfaceOrientationUnknown）

if (![UIDevice currentDevice].generatesDeviceOrientationNotifications) {

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

}

[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(handleDeviceOrientationChange:)

name:UIDeviceOrientationDidChangeNotification object:nil];

//裝置方向改變的處理

- (void)handleDeviceOrientationChange:(NSNotification *)notification{

UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;

switch (ddeviceOrientation) {

case UIDeviceOrientationFaceUp:

NSLog(@"螢幕朝上平躺");

break;

case UIDeviceOrientationFaceDown:

NSLog(@"螢幕朝下平躺");

break;

case UIDeviceOrientationUnknown:

NSLog(@"未知方向");

break;

case UIDeviceOrientationLandscapeLeft:

NSLog(@"螢幕向左橫置");

break;

case UIDeviceOrientationLandscapeRight:

NSLog(@"螢幕向右橫置");

break;

case UIDeviceOrientationPortrait:

NSLog(@"螢幕直立");

break;

case UIDeviceOrientationPortraitUpsideDown:

NSLog(@"螢幕直立，上下顛倒");

break;

default:

NSLog(@"無法辨識");

break;

}

//最後在dealloc中移除通知和結束裝置旋轉的通知

- (void)dealloc{

//...

[[NSNotificationCenter defaultCenter]removeObserver:self];

[[UIDevice currentDevice]endGeneratingDeviceOrientationNotifications];

說明：手機鎖定豎屏後，UIDeviceOrientationDidChangeNotification通知就失效了。

2、UIInterfaceOrientation：介面方向

介面方向是反應iOS中介面的方向，它和Home按鈕的方向是一致的。

1）iOS定義了以下五種介面方向

typedef NS_ENUM(NSInteger, UIInterfaceOrientation) {
    UIInterfaceOrientationUnknown            = UIDeviceOrientationUnknown,       //未知方向
    UIInterfaceOrientationPortrait           = UIDeviceOrientationPortrait,               //介面直立
    UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown,  //介面直立，上下顛倒
    UIInterfaceOrientationLandscapeLeft      = UIDeviceOrientationLandscapeRight,   //介面朝左
    UIInterfaceOrientationLandscapeRight     = UIDeviceOrientationLandscapeLeft    //介面朝右
} __TVOS_PROHIBITED;

typedef NS_ENUM(NSInteger, UIInterfaceOrientation) {

UIInterfaceOrientationUnknown = UIDeviceOrientationUnknown, //未知方向

UIInterfaceOrientationPortrait = UIDeviceOrientationPortrait, //介面直立

UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown, //介面直立，上下顛倒

UIInterfaceOrientationLandscapeLeft = UIDeviceOrientationLandscapeRight, //介面朝左

UIInterfaceOrientationLandscapeRight = UIDeviceOrientationLandscapeLeft //介面朝右

} __TVOS_PROHIBITED;

說明：從定義可知，介面方向和設別方向有對應關係，如介面的豎直方向就是裝置的豎直方向：UIInterfaceOrientationUnknown = UIDeviceOrientationUnknown

2）讀取介面方向

UIInterfaceOrientation和狀態列有關，通過UIApplication的單例呼叫statusBarOrientation來獲取

 UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation];

1	UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation];

3）監聽、處理和移除介面方向改變的通知

當介面方向變化時候，先後發出UIApplicationWillChangeStatusBarOrientationNotification和UIApplicationDidChangeStatusBarOrientationNotification通知；註冊監聽這兩個通知，可以針對不同的介面方向處理檢視展示。

//以監聽UIApplicationDidChangeStatusBarOrientationNotification通知為例
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(handleStatusBarOrientationChange:) 
                                     name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];


//介面方向改變的處理
- (void)handleStatusBarOrientationChange: (NSNotification *)notification{

    UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation];
    switch (interfaceOrientation) {

        case UIInterfaceOrientationUnknown:
            NSLog(@"未知方向");
            break;

        case UIInterfaceOrientationPortrait:
            NSLog(@"介面直立");
            break;

        case UIInterfaceOrientationPortraitUpsideDown:
            NSLog(@"介面直立，上下顛倒");
            break;

        case UIInterfaceOrientationLandscapeLeft:
            NSLog(@"介面朝左");
            break;

        case UIInterfaceOrientationLandscapeRight:
            NSLog(@"介面朝右");
            break;

        default:
            break;
    }
}

//最後在dealloc中移除通知
- (void)dealloc{
    //...
    [[NSNotificationCenter defaultCenter]removeObserver:self];
    [[UIDevice currentDevice]endGeneratingDeviceOrientationNotifications];
}

//以監聽UIApplicationDidChangeStatusBarOrientationNotification通知為例

[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(handleStatusBarOrientationChange:)

name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];

//介面方向改變的處理

- (void)handleStatusBarOrientationChange: (NSNotification *)notification{

UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation];

switch (interfaceOrientation) {

case UIInterfaceOrientationUnknown:

NSLog(@"未知方向");

break;

case UIInterfaceOrientationPortrait:

NSLog(@"介面直立");

break;

case UIInterfaceOrientationPortraitUpsideDown:

NSLog(@"介面直立，上下顛倒");

break;

case UIInterfaceOrientationLandscapeLeft:

NSLog(@"介面朝左");

break;

case UIInterfaceOrientationLandscapeRight:

NSLog(@"介面朝右");

break;

default:

break;

}

//最後在dealloc中移除通知

- (void)dealloc{

//...

[[NSNotificationCenter defaultCenter]removeObserver:self];

[[UIDevice currentDevice]endGeneratingDeviceOrientationNotifications];

}

說明：手機鎖定豎屏後，UIApplicationWillChangeStatusBarOrientationNotification和UIApplicationDidChangeStatusBarOrientationNotification通知也失效了。

3、UIInterfaceOrientationMask

UIInterfaceOrientationMask是為了整合多種UIInterfaceOrientation而定義的型別，和ViewController相關，一共有7種

1）iOS中的UIInterfaceOrientationMask定義

typedef NS_OPTIONS(NSUInteger, UIInterfaceOrientationMask) {
    UIInterfaceOrientationMaskPortrait = (1 << UIInterfaceOrientationPortrait),
    UIInterfaceOrientationMaskLandscapeLeft = (1 << UIInterfaceOrientationLandscapeLeft),
    UIInterfaceOrientationMaskLandscapeRight = (1 << UIInterfaceOrientationLandscapeRight),
    UIInterfaceOrientationMaskPortraitUpsideDown = (1 << UIInterfaceOrientationPortraitUpsideDown),
    UIInterfaceOrientationMaskLandscape = (UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight),
    UIInterfaceOrientationMaskAll = (UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight | UIInterfaceOrientationMaskPortraitUpsideDown),
    UIInterfaceOrientationMaskAllButUpsideDown = (UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight),
} __TVOS_PROHIBITED;

typedef NS_OPTIONS(NSUInteger, UIInterfaceOrientationMask) {

UIInterfaceOrientationMaskPortrait = (1 << UIInterfaceOrientationPortrait),

UIInterfaceOrientationMaskLandscapeLeft = (1 << UIInterfaceOrientationLandscapeLeft),

UIInterfaceOrientationMaskLandscapeRight = (1 << UIInterfaceOrientationLandscapeRight),

UIInterfaceOrientationMaskPortraitUpsideDown = (1 << UIInterfaceOrientationPortraitUpsideDown),

UIInterfaceOrientationMaskLandscape = (UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight),

UIInterfaceOrientationMaskAll = (UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight | UIInterfaceOrientationMaskPortraitUpsideDown),

UIInterfaceOrientationMaskAllButUpsideDown = (UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight),

} __TVOS_PROHIBITED;

2）UIInterfaceOrientationMask的使用

在ViewController可以重寫- (UIInterfaceOrientationMask)supportedInterfaceOrientations方法返回型別，來決定UIViewController可以支援哪些介面方向。

//支援介面直立
- (UIInterfaceOrientationMask)supportedInterfaceOrientations{
    return UIInterfaceOrientationMaskPortrait;
}

//支援介面直立

- (UIInterfaceOrientationMask)supportedInterfaceOrientations{

return UIInterfaceOrientationMaskPortrait;

}

總結：UIDeviceOrientation（裝置方向）和UIInterfaceOrientation（螢幕方向）是兩個不同的概念。前者代表了裝置的一種狀態，而後者是螢幕為了應對不同的裝置狀態，做出的使用者介面上的響應。在iOS裝置旋轉時，由UIKit接收到旋轉事件，然後通過AppDelegate通知當前程式的UIWindow物件，UIWindow物件通知它的rootViewController，如果該rootViewController支援旋轉後的螢幕方向，完成旋轉，否則不旋轉；彈出的ViewController也是如此處理。

二、檢視控制器中旋轉方向的設定

0、關於禁止橫屏的操作（不建議）

比較常規的方法有兩種。

方法1：在專案的General–>Deployment Info–>Device Orientation中，只勾選Portrait(豎屏)

勾選Portrait.png

方法2：Device Orientation預設設定，在Appdelegate中實現supportedInterfaceOrientationsForWindow:只返回UIInterfaceOrientationMaskPortraitt(豎屏)

-  (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window  {  
     return UIInterfaceOrientationMaskPortrait;  
}

- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {

return UIInterfaceOrientationMaskPortrait;

}

說明：極少的APP中所有介面都是豎屏的，因為總會有介面需要支援橫屏，如視訊播放頁。所以不建議設定禁止APP頁面橫屏。

下面介紹如何讓專案中的檢視控制器中旋轉方向的設定

1、APP支援多個方向

APP支援多個方向.png

說明：如此，APP支援橫屏和豎屏了，但是具體檢視控制器支援的頁面方向還需要進一步處理。由於不支援豎屏顛倒(Upside Down)，即使裝置上下顛倒，通過API也不會獲得裝置、螢幕上下顛倒方向的。

2、支援ViewController螢幕方向設定

1）關鍵函式

檢視控制器支援的介面方向主要由以下三個函式控制

//是否自動旋轉,返回YES可以自動旋轉,返回NO禁止旋轉  
- (BOOL)shouldAutorotate NS_AVAILABLE_IOS(6_0) __TVOS_PROHIBITED;  

//返回支援的方向  
- (UIInterfaceOrientationMask)supportedInterfaceOrientations NS_AVAILABLE_IOS(6_0) __TVOS_PROHIBITED;  

//由模態推出的檢視控制器 優先支援的螢幕方向
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation NS_AVAILABLE_IOS(6_0) __TVOS_PROHIBITED;

//是否自動旋轉,返回YES可以自動旋轉,返回NO禁止旋轉

- (BOOL)shouldAutorotate NS_AVAILABLE_IOS(6_0) __TVOS_PROHIBITED;

//返回支援的方向

- (UIInterfaceOrientationMask)supportedInterfaceOrientations NS_AVAILABLE_IOS(6_0) __TVOS_PROHIBITED;

//由模態推出的檢視控制器優先支援的螢幕方向

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation NS_AVAILABLE_IOS(6_0) __TVOS_PROHIBITED;

2） QSBaseViewController設定

//QSBaseViewController.h
@interface QSBaseController : UIViewController

@end

//QSBaseViewController.m
@implementation QSBaseController

  //#pragma mark - 控制螢幕旋轉方法
//是否自動旋轉,返回YES可以自動旋轉,返回NO禁止旋轉
- (BOOL)shouldAutorotate{
    return NO;
}

//返回支援的方向
- (UIInterfaceOrientationMask)supportedInterfaceOrientations{
    return UIInterfaceOrientationMaskPortrait;
}

//由模態推出的檢視控制器 優先支援的螢幕方向
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{
    return UIInterfaceOrientationPortrait;
}
@end

//QSBaseViewController.h

@interface QSBaseController : UIViewController

@end

//QSBaseViewController.m

@implementation QSBaseController

//#pragma mark - 控制螢幕旋轉方法

//是否自動旋轉,返回YES可以自動旋轉,返回NO禁止旋轉

- (BOOL)shouldAutorotate{

return NO;

}

//返回支援的方向

- (UIInterfaceOrientationMask)supportedInterfaceOrientations{

return UIInterfaceOrientationMaskPortrait;

}

//由模態推出的檢視控制器優先支援的螢幕方向

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{

return UIInterfaceOrientationPortrait;

}

@end

說明1：QSBaseViewController預設不支援旋轉，只支援 介面豎直方向，專案中的Controller都繼承自QSBaseViewController，可以通過重寫這三個方法來讓Controller支援除豎屏之外的方向或旋轉。

3）在QSNavigationController設定

目標：通過QSNavigationController來push檢視控制器時，把支援螢幕旋轉的設定交給最新push進來([self.viewControllers lastObject])的viewController來設定。

//QSNavigationController.h
@interface QSNavigationController : UINavigationController

@end

//QSNavigationController.m
@implementation QSNavigationController

#pragma mark - 控制螢幕旋轉方法
- (BOOL)shouldAutorotate{  
    return [[self.viewControllers lastObject]shouldAutorotate];
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations{
    return [[self.viewControllers lastObject]supportedInterfaceOrientations];
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{
    return [[self.viewControllers lastObject] preferredInterfaceOrientationForPresentation];
}
@end

//QSNavigationController.h

@interface QSNavigationController : UINavigationController

@end

//QSNavigationController.m

@implementation QSNavigationController

#pragma mark - 控制螢幕旋轉方法

- (BOOL)shouldAutorotate{

return [[self.viewControllers lastObject]shouldAutorotate];

}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations{

return [[self.viewControllers lastObject]supportedInterfaceOrientations];

}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{

return [[self.viewControllers lastObject] preferredInterfaceOrientationForPresentation];

}

@end

4）在QSTabBarController設定

目標：TabBarController通常作為整個程式的rootViewController，UITabBar上面顯示的每一個Tab都對應著一個ViewController；每點選一個Tab，出現的ViewController（self.selectedViewController）對螢幕旋轉和支援方向的設定交給其自身去控制。

//QSTabBarController.h
@interface QSTabBarController : UITabBarController

@end

//QSTabBarController.m
@implementation QSTabBarController

#pragma mark - 控制螢幕旋轉方法
- (BOOL)shouldAutorotate{
    return [self.selectedViewController shouldAutorotate];
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations{
    return [self.selectedViewController supportedInterfaceOrientations];
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{
    return [self.selectedViewController preferredInterfaceOrientationForPresentation];
}
@end

//QSTabBarController.h

@interface QSTabBarController : UITabBarController

@end

//QSTabBarController.m

@implementation QSTabBarController

#pragma mark - 控制螢幕旋轉方法

- (BOOL)shouldAutorotate{

return [self.selectedViewController shouldAutorotate];

}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations{

return [self.selectedViewController supportedInterfaceOrientations];

}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{

return [self.selectedViewController preferredInterfaceOrientationForPresentation];

}

@end

三、螢幕旋轉方向下的檢視處理

1、螢幕旋轉時，建議監聽UIApplicationDidChangeStatusBarOrientationNotification

原因1：supportedInterfaceOrientations方法中最終返回的是 多個介面方向。

原因2（最重要的原因）：我們真正要處理的是頁面方向發生旋轉UI的變化。而在裝置的物理方向發生旋轉的時候，如果此時當前控制器的頁面並沒有旋轉，我們這時改變UI佈局，可能就發生問題了。

2、螢幕的寬高處理

1）在iOS 8之後，當螢幕旋轉的時候，[[UIScreen mainScreen] bounds]也發生了改變。如橫屏時候的螢幕寬度其實是豎屏的時候螢幕的高度。

2）我們處理檢視佈局時候，如果使用到螢幕的寬高，不要直接使用SCREEN_HEIGHT和SCREEN_WIDTH，而使用SCREEN_MIN和SCREEN_MAX

#define SCREEN_HEIGHT CGRectGetHeight([[UIScreen mainScreen] bounds])
#define SCREEN_WIDTH  CGRectGetWidth([[UIScreen mainScreen] bounds])

#define SCREEN_MIN MIN(SCREEN_HEIGHT,SCREEN_WIDTH)
#define SCREEN_MAX MAX(SCREEN_HEIGHT,SCREEN_WIDTH)

#define SCREEN_HEIGHT CGRectGetHeight([[UIScreen mainScreen] bounds])

#define SCREEN_WIDTH CGRectGetWidth([[UIScreen mainScreen] bounds])

#define SCREEN_MIN MIN(SCREEN_HEIGHT,SCREEN_WIDTH)

#define SCREEN_MAX MAX(SCREEN_HEIGHT,SCREEN_WIDTH)

說明：豎屏時候，寬是SCREEN_MIN，高是SCREEN_MAX；橫屏時候，寬是SCREEN_MAX，高是SCREEN_MIN。

3、螢幕旋轉下處理Demo

//監聽UIApplicationDidChangeStatusBarOrientationNotification的處理
- (void)handleStatusBarOrientationChange: (NSNotification *)notification{

    UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation];
    BOOL isLandscape = NO;
    switch (interfaceOrientation) {

        case UIInterfaceOrientationUnknown:
            NSLog(@"未知方向");
            break;

        case UIInterfaceOrientationPortrait:
        case UIInterfaceOrientationPortraitUpsideDown:
            isLandscape = NO;
            break;

        case UIInterfaceOrientationLandscapeLeft:
        case UIInterfaceOrientationLandscapeRight:
            isLandscape = YES;
            break;

        default:
            break;
    }
    if (isLandscape) {
        self.tableView.frame = CGRectMake(0, 0, SCREEN_MAX, SCREEN_MIN - 44);
    }else{
        self.tableView.frame = CGRectMake(0, 0, SCREEN_MIN, SCREEN_MAX - 64);
    }

    [self.tableView reloadData];
}

//監聽UIApplicationDidChangeStatusBarOrientationNotification的處理

- (void)handleStatusBarOrientationChange: (NSNotification *)notification{

UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation];

BOOL isLandscape = NO;

switch (interfaceOrientation) {

case UIInterfaceOrientationUnknown:

NSLog(@"未知方向");

break;

case UIInterfaceOrientationPortrait:

case UIInterfaceOrientationPortraitUpsideDown:

isLandscape = NO;

break;

case UIInterfaceOrientationLandscapeLeft:

case UIInterfaceOrientationLandscapeRight:

isLandscape = YES;

break;

default:

break;

}

if (isLandscape) {

self.tableView.frame = CGRectMake(0, 0, SCREEN_MAX, SCREEN_MIN - 44);

}else{

self.tableView.frame = CGRectMake(0, 0, SCREEN_MIN, SCREEN_MAX - 64);

}

[self.tableView reloadData];

}

說明：當然也可以選擇使用Masonry這樣優秀的AutoLayout佈局第三方庫來處理，storyBoard來佈局次之。

4、螢幕旋轉下處理Demo效果圖

豎屏下效果.png

橫屏下效果.png

5、螢幕旋轉處理的建議

1）旋轉前後，view當前顯示的位置儘量不變

2）旋轉過程中，暫時介面操作的響應

3）檢視中有tableview的話，旋轉後，強制 [tableview reloadData]，保證在方向變化以後，新的row能夠充滿全屏。

四、強制橫屏

APP中某些頁面，如視訊播放頁，一出現就要求橫屏。這些橫屏頁面或模態彈出、或push進來。

1、模態彈出ViewController情況下強制橫屏的設定

//QSShow3Controller.m
- (BOOL)shouldAutorotate{
    return NO;
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations{
    return UIInterfaceOrientationMaskLandscapeRight;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{
    return UIInterfaceOrientationLandscapeRight;
}

//模態彈出
QSShow3Controller *vc = [[QSShow3Controller alloc]init];
[self presentViewController:vc animated:YES completion:nil];

//QSShow3Controller.m

- (BOOL)shouldAutorotate{

return NO;

}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations{

return UIInterfaceOrientationMaskLandscapeRight;

}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{

return UIInterfaceOrientationLandscapeRight;

}

//模態彈出

QSShow3Controller *vc = [[QSShow3Controller alloc]init];

[self presentViewController:vc animated:YES completion:nil];

說明：這種情況比較簡單處理。

2、push推入ViewController情況下強制橫屏的設定

//QSShow4Controller.m
-(void)viewWillAppear:(BOOL)animated{

   [super viewWillAppear:animated];
   [self setInterfaceOrientation:UIInterfaceOrientationLandscapeRight];
}

//強制轉屏（這個方法最好放在BaseVController中）
- (void)setInterfaceOrientation:(UIInterfaceOrientation)orientation{

    if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {
        SEL selector  = NSSelectorFromString(@"setOrientation:");
        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
        [invocation setSelector:selector];
        [invocation setTarget:[UIDevice currentDevice]];
        // 從2開始是因為前兩個引數已經被selector和target佔用
        [invocation setArgument:&orientation atIndex:2];
        [invocation invoke];
    }
}

//必須返回YES
- (BOOL)shouldAutorotate{
    return YES;
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations{
    return UIInterfaceOrientationMaskLandscapeRight;
}

//Push推入
QSShow4Controller *vc = [[QSShow4Controller alloc]init];
[self.navigationController pushViewController:vc animated:YES];

//QSShow4Controller.m

-(void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];

[self setInterfaceOrientation:UIInterfaceOrientationLandscapeRight];

}

//強制轉屏（這個方法最好放在BaseVController中）

- (void)setInterfaceOrientation:(UIInterfaceOrientation)orientation{

if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {

SEL selector = NSSelectorFromString(@"setOrientation:");

NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];

[invocation setSelector:selector];

[invocation setTarget:[UIDevice currentDevice]];

// 從2開始是因為前兩個引數已經被selector和target佔用

[invocation setArgument:&orientation atIndex:2];

[invocation invoke];

}

//必須返回YES

- (BOOL)shouldAutorotate{

return YES;

}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations{

return UIInterfaceOrientationMaskLandscapeRight;

}

//Push推入

QSShow4Controller *vc = [[QSShow4Controller alloc]init];

[self.navigationController pushViewController:vc animated:YES];

說明：蘋果不允許直接呼叫setOrientation方法，否則有被拒的風險；使用NSInvocation物件給[UIDevice currentDevice]發訊息，強制改變裝置方向，使其頁面方向對應改變，這是蘋果允許的。

五、其他

1、 APP啟動時，手機橫屏下，首頁UI（該頁面只支援豎屏）出錯（add by 2017/6/20）

Objective-C

//設定設定狀態列豎屏 [[UIApplication sharedApplication]setStatusBarOrientation:UIInterfaceOrientationPortrait];

1
2

//設定設定狀態列豎屏
[[UIApplication sharedApplication]setStatusBarOrientation:UIInterfaceOrientationPortrait];
以上詳細原始碼參考：QSRotationScreenDemo

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程式碼處理 iOS 的橫豎屏旋轉

1、UIDeviceOrientation：裝置方向

2、UIInterfaceOrientation：介面方向

3、UIInterfaceOrientationMask

二、檢視控制器中旋轉方向的設定

0、關於禁止橫屏的操作（不建議）

1、APP支援多個方向

2、支援ViewController螢幕方向設定

三、螢幕旋轉方向下的檢視處理

1、螢幕旋轉時，建議監聽UIApplicationDidChangeStatusBarOrientationNotification

2、螢幕的寬高處理

3、螢幕旋轉下處理Demo

4、螢幕旋轉下處理Demo效果圖

5、螢幕旋轉處理的建議

四、強制橫屏

1、模態彈出ViewController情況下 強制橫屏的設定

2、push推入ViewController情況下 強制橫屏的設定

五、其他

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1、模態彈出ViewController情況下強制橫屏的設定

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