溫馨提示×

溫馨提示×

您好,登錄后才能下訂單哦!

密碼登錄×
登錄注冊×
其他方式登錄
點擊 登錄注冊 即表示同意《億速云用戶服務(wù)條款》

iOS屏幕旋轉(zhuǎn)與鎖屏的示例代碼

發(fā)布時間:2020-09-09 11:38:14 來源:腳本之家 閱讀:419 作者:小八哥哥哥 欄目:移動開發(fā)

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

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:

  • 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方向。

在設(shè)備屏幕旋轉(zhuǎn)時,系統(tǒng)會調(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 的時候, - supportedInterfaceOrientations 方法才會被調(diào)用,以確定是否需要旋轉(zhuǎn)界面。

這個是 TabbarController 中設(shè)置的,它會影響關(guān)聯(lián)的 UIViewController 的支持方向,需要在 UIViewController 中進一步設(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開始是因為0 1 兩個參數(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

這里先擴展 UIDeviceOrientation & UIInterfaceOrientation 的知識

UIDeviceOrientation 設(shè)備的物理方向

UIDeviceOrientation 即我們手持的移動設(shè)備的 Orientation ,是一個三圍空間,有六個方向,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,是一個二維空間,有四個方向, 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枚舉取值,可用一個枚舉取值來代表多個屏幕方向,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)時就需要內(nèi)容(即界面)向右轉(zhuǎn)。即:

UIInterfaceOrientationLandscapeLeft = UIDeviceOrientationLandscapeRight
UIInterfaceOrientationLandscapeRight = UIDeviceOrientationLandscapeLeft

下面還會舉例說明。

其實 UIDeviceOrientationUIInterfaceOrientation 是兩個互不相干的屬性,通常情況下會一起出現(xiàn),在這里正好利用此特性在屏幕旋轉(zhuǎn)后進行重新布局。

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)生變化這個過程觸發(fā) UIDeviceOrientationDidChangeNotification 監(jiān)聽,然后進行重新布局。

3、旋轉(zhuǎn)時狀態(tài)欄的隱藏與顯示

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

//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 Push 或 Present 返回后

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

5、 針對特定 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;
 }

最后的獻上 GitHub 代碼,還有2個小的 bug ,有興趣的朋友歡迎來探討。

以上就是本文的全部內(nèi)容,希望對大家的學(xué)習(xí)有所幫助,也希望大家多多支持億速云。

向AI問一下細節(jié)

免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點不代表本網(wǎng)站立場,如果涉及侵權(quán)請聯(lián)系站長郵箱:is@yisu.com進行舉報,并提供相關(guān)證據(jù),一經(jīng)查實,將立刻刪除涉嫌侵權(quán)內(nèi)容。

AI