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iOS屏幕旋轉(zhuǎn)與鎖屏的示例代碼

在做視頻開發(fā)時(shí)遇到屏幕旋轉(zhuǎn)問題,其中涉及到 StatusBar、 UINavigationController、UITabBarController 、UIViewcontroller 。

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在設(shè)備鎖屏下的整體效果圖

iOS屏幕旋轉(zhuǎn)與鎖屏的示例代碼

iOS-旋轉(zhuǎn).gif

主要涉及以下4點(diǎn)：

  • 橫豎屏的旋轉(zhuǎn)
  • 屏幕旋轉(zhuǎn)相應(yīng)改變視圖位置
  • 旋轉(zhuǎn)時(shí)狀態(tài)欄的隱藏與顯示
  • 鎖屏

1、橫豎屏旋轉(zhuǎn)

第1步：

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

//  NSLog(@"0000000---------%@",NSStringFromClass([[self topViewController] class]));
//  if ([NSStringFromClass([[self topViewController] class]) isEqualToString:@"FirstViewController"]) {
//    //橫屏
//    return UIInterfaceOrientationMaskLandscapeRight;
//  }
//  //豎屏
//  return UIInterfaceOrientationMaskPortrait;
  
  NSUInteger orientations = UIInterfaceOrientationMaskAllButUpsideDown;

  if(self.window.rootViewController){
    //取出當(dāng)前顯示的控制器
    UIViewController *presentedViewController = [self topViewControllerWithRootViewController:self.window.rootViewController];
    //按當(dāng)前控制器支持的方向確定旋轉(zhuǎn)方向(將旋轉(zhuǎn)方向重新交給每個(gè)控制器自己控制)
    NSLog(@"%s, line = %d",__FUNCTION__,__LINE__);
    orientations = [presentedViewController supportedInterfaceOrientations];
  }

  return orientations;
}
//獲取界面最上層的控制器
//- (UIViewController*)topViewController {
//  NSLog(@"%s, line = %d",__FUNCTION__,__LINE__);
//  return [self topViewControllerWithRootViewController:[UIApplication sharedApplication].keyWindow.rootViewController];
//}
//一層一層的進(jìn)行查找判斷
- (UIViewController*)topViewControllerWithRootViewController:(UIViewController*)rootViewController {
  NSLog(@"%s, line = %d",__FUNCTION__,__LINE__);
  if ([rootViewController isKindOfClass:[UITabBarController class]]) {
    
    UITabBarController* tabBarController = (UITabBarController*)rootViewController;
    NSLog(@"Tabbar:%@",NSStringFromClass([tabBarController.selectedViewController class]));

    return [self topViewControllerWithRootViewController:tabBarController.selectedViewController];
  } else if ([rootViewController isKindOfClass:[UINavigationController class]]) {
    
    UINavigationController* nav = (UINavigationController*)rootViewController;
    NSLog(@"nav:%@",NSStringFromClass([nav.visibleViewController class]));
    return [self topViewControllerWithRootViewController:nav.visibleViewController];
  } else if (rootViewController.presentedViewController) {
    NSLog(@"present:%@",NSStringFromClass([rootViewController.presentationController class]));
    UIViewController* presentedViewController = rootViewController.presentedViewController;
    return [self topViewControllerWithRootViewController:presentedViewController];
  } else {
    NSLog(@"root:%@",rootViewController);
    return rootViewController;
  }
}

代碼中通過 -(UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window 方法將控制器交給自己控制，該方法默認(rèn)值為 Info.plist 中配置的 Supported interface orientations 項(xiàng)的值。

第2步：在各控制器設(shè)置支持的方向

//是否允許旋轉(zhuǎn)(默認(rèn)允許)
- (BOOL)shouldAutorotate {
  return YES;
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations{
  //允許旋轉(zhuǎn)的方向
  return UIInterfaceOrientationMaskAll;
}

其中 - supportedInterfaceOrientations 方法在 iPad 中默認(rèn)取值為 UIInterfaceOrientationMaskAll ，即默認(rèn)支持所有屏幕方向；而 iPhone 跟 iPod Touch 的默認(rèn)取值為 UIInterfaceOrientationMaskAllButUpsideDown ，即支持除豎屏向下以外的三個(gè)方向。

在設(shè)備屏幕旋轉(zhuǎn)時(shí)，系統(tǒng)會(huì)調(diào)用 - shouldAutorotate 方法檢查當(dāng)前界面是否支持旋轉(zhuǎn)，只有 - shouldAutorotate 返回 YES 的時(shí)候， - supportedInterfaceOrientations 方法才會(huì)被調(diào)用，以確定是否需要旋轉(zhuǎn)界面。

這個(gè)是 TabbarController 中設(shè)置的,它會(huì)影響關(guān)聯(lián)的 UIViewController 的支持方向，需要在 UIViewController 中進(jìn)一步設(shè)置

//此方法來控制能否橫豎屏 控制鎖屏
 - (UIInterfaceOrientationMask)supportedInterfaceOrientations {
   NSLog(@"%s, line = %d",__FUNCTION__,__LINE__);
   UIInterfaceOrientationMask inter;
   if (_lockScreen) {
     switch (_lockOrientation) {
       case 1:
         inter = UIInterfaceOrientationMaskPortrait;
         break;
       case 2:
         inter = UIInterfaceOrientationMaskPortraitUpsideDown;
         break;
       case 3:
         inter = UIInterfaceOrientationMaskLandscapeRight;
         break;
       case 4:
         inter = UIInterfaceOrientationMaskLandscapeLeft;
         break;
       default:inter = UIInterfaceOrientationMaskAll;
         break;
     }
   } else {
     inter = UIInterfaceOrientationMaskAll;
   }
   //支持全部方向
   return inter;
 }

第3步：強(qiáng)制轉(zhuǎn)換控制器方向

- (void)setInterOrientation:(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]];
     int val         = orientation;
     // 從2開始是因?yàn)? 1 兩個(gè)參數(shù)已經(jīng)被selector和target占用
     [invocation setArgument:&val atIndex:2];
     [invocation invoke];
   }
 }

這樣就可以完成橫豎屏的切換。

2、屏幕旋轉(zhuǎn)相應(yīng)改變視圖位置

這里先擴(kuò)展 UIDeviceOrientation & UIInterfaceOrientation 的知識(shí)

UIDeviceOrientation 設(shè)備的物理方向

UIDeviceOrientation 即我們手持的移動(dòng)設(shè)備的 Orientation ，是一個(gè)三圍空間,有六個(gè)方向,通過 [UIDevice currentDevice].orientation 獲取當(dāng)前設(shè)備的方向。

typedef NS_ENUM(NSInteger, UIDeviceOrientation) {
  UIDeviceOrientationUnknown,
  UIDeviceOrientationPortrait,      
  UIDeviceOrientationPortraitUpsideDown, // Device oriented vertically, home button on the top 豎屏向下，即頭在下，Home 鍵在上
  UIDeviceOrientationLandscapeLeft,    // Device oriented horizontally, home button on the right 橫屏頭在左，Home鍵在右
  UIDeviceOrientationLandscapeRight,   // Device oriented horizontally, home button on the left 橫屏頭在右，Home鍵在左
  UIDeviceOrientationFaceUp,       // Device oriented flat, face up
  UIDeviceOrientationFaceDown       // Device oriented flat, face down
} ;

UIInterfaceOrientation 界面的顯示方向

UIInterfaceOrientation 即我們看到的視圖的 Orientation ，可以理解為 statusBar 所在的方向，是一個(gè)二維空間，有四個(gè)方向, 通過 [UIApplication sharedApplication].statusBarOrientation 即狀態(tài)欄的方向獲取當(dāng)前界面方向。

// Note that UIInterfaceOrientationLandscapeLeft is equal to  UIDeviceOrientationLandscapeRight (and vice versa).
// This is because rotating the device to the left requires rotating the content to the right.
typedef NS_ENUM(NSInteger, UIInterfaceOrientation) {
  UIInterfaceOrientationUnknown      = UIDeviceOrientationUnknown,
  UIInterfaceOrientationPortrait      = UIDeviceOrientationPortrait,
  UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown,
  UIInterfaceOrientationLandscapeLeft   = UIDeviceOrientationLandscapeRight,
  UIInterfaceOrientationLandscapeRight   = UIDeviceOrientationLandscapeLeft
}

UIInterfaceOrientationMask 支持的方向

// iOS 6 之后用于控制界面的枚舉值
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),
}

由上可以發(fā)現(xiàn)：

iOS 6 及之后版本使用的 UIInterfaceOrientationMask 類型來控制屏幕屏幕方向，該類型也新增加了幾個(gè)枚舉取值，可用一個(gè)枚舉取值來代表多個(gè)屏幕方向，使用起來更方便。

注意在 UIInterfaceOrientation 中有注釋

Note that UIInterfaceOrientationLandscapeLeft is equal to UIDeviceOrientationLandscapeRight (and vice versa).

This is because rotating the device to the left requires rotating the content to the right，大意是界面的左轉(zhuǎn)相當(dāng)于設(shè)備的右轉(zhuǎn)，如果設(shè)備向左轉(zhuǎn)時(shí)就需要內(nèi)容（即界面）向右轉(zhuǎn)。即：

UIInterfaceOrientationLandscapeLeft = UIDeviceOrientationLandscapeRight
UIInterfaceOrientationLandscapeRight = UIDeviceOrientationLandscapeLeft

下面還會(huì)舉例說明。

其實(shí) UIDeviceOrientation 與 UIInterfaceOrientation 是兩個(gè)互不相干的屬性，通常情況下會(huì)一起出現(xiàn)，在這里正好利用此特性在屏幕旋轉(zhuǎn)后進(jìn)行重新布局。

第1步：監(jiān)聽 UIDeviceOrientationDidChangeNotification 狀態(tài)

//監(jiān)聽設(shè)備旋轉(zhuǎn) 改變 視圖 對(duì)應(yīng)位置
 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(deviceOrientationDidChange) name:UIDeviceOrientationDidChangeNotification object:nil];

//用來控制橫豎屏?xí)r調(diào)整視圖位置
- (void)deviceOrientationDidChange
{
  [self isPortrait]; 
}

第2步：重新布局

if (_interOrientation == UIInterfaceOrientationPortrait || _interOrientation == UIInterfaceOrientationPortraitUpsideDown) {
     self.top.constant = 145;
     self.bottom.constant = 210;
     
   } else if (_interOrientation == UIInterfaceOrientationLandscapeRight || _interOrientation == UIInterfaceOrientationLandscapeLeft) {
     self.top.constant = 40;
     self.bottom.constant = 50;
   }

例如：豎屏轉(zhuǎn)橫屏

界面豎屏 UIInterfaceOrientationPortrait ->橫屏 UIInterfaceOrientationLandscapeRight ，設(shè)備方向 UIDeviceOrientationPortrait -> UIDeviceOrientationLandscapeLeft ,在設(shè)備發(fā)生變化這個(gè)過程觸發(fā) UIDeviceOrientationDidChangeNotification 監(jiān)聽，然后進(jìn)行重新布局。

3、旋轉(zhuǎn)時(shí)狀態(tài)欄的隱藏與顯示

這里只記述旋轉(zhuǎn)時(shí)狀態(tài)欄的變化，由豎屏想橫屏變化時(shí)狀態(tài)欄會(huì)消失。

//在需要的`UIViewController`設(shè)置是否隱藏
- (BOOL)prefersStatusBarHidden {
 NSLog(@"%s, line = %d",__FUNCTION__,__LINE__);
 return NO;
}

4、鎖屏

鎖屏?xí)r，不管系統(tǒng)鎖屏是否關(guān)閉、Push 或 Present 返回后，界面依然保持不變。

第1步：設(shè)置鎖屏

- (IBAction)lockAction:(UIButton *)sender {
   if (_lockScreen) {
     
     _lockScreen = NO;
     [sender setTitle:@"鎖定屏幕" forState:UIControlStateNormal];
   } else {
     _lockScreen = YES;
     
     [sender setTitle:@"解開屏幕" forState:UIControlStateNormal];
   }
   _lockOrientation = _interOrientation;
 }

第2步：繞過強(qiáng)轉(zhuǎn)

- (void)interfaceOrientation:(UIInterfaceOrientation)orientation
 {
   
   [self isPortrait];
   //鎖屏情況下 不旋轉(zhuǎn)
   if (!_lockScreen) {
     [self setInterOrientation:orientation];
   }

第3步：針對(duì) Push 或 Present 返回后

- (void)viewWillAppear:(BOOL)animated {
   
   if (_lockScreen) {
     //記錄返回時(shí)的界面狀態(tài)
     [self setInterOrientation:_lockOrientation];
   } else {
    [self isPortrait];
   }
 }

5、 針對(duì)特定 UIViewController 方向的支持

-(UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
 
   if ([NSStringFromClass([[self topViewController] class]) isEqualToString:@"FirstViewController"]) {
     //橫屏
     return UIInterfaceOrientationMaskLandscapeRight;
   }
   //豎屏
   return UIInterfaceOrientationMaskPortrait;
 }

最后的獻(xiàn)上 GitHub 代碼，還有2個(gè)小的 bug ，有興趣的朋友歡迎來探討。

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持創(chuàng)新互聯(lián)。


標(biāo)題名稱：iOS屏幕旋轉(zhuǎn)與鎖屏的示例代碼
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