在做视频开发时遇到屏幕旋转问题,其中涉及到 StatusBar、 UINavigationController、UITabBarController 、UIViewcontroller 。
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在设备锁屏下的整体效果图
iOS-旋转.gif
主要涉及以下4点：
- 横竖屏的旋转
- 屏幕旋转相应改变视图位置
- 旋转时状态栏的隐藏与显示
- 锁屏
1、横竖屏旋转
第1步：
-(UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
// NSLog(@"0000000---------%@",NSStringFromClass([[self topViewController] class]));
// if ([NSStringFromClass([[self topViewController] class]) isEqualToString:@"FirstViewController"]) {
// //横屏
// return UIInterfaceOrientationMaskLandscapeRight;
// }
// //竖屏
// return UIInterfaceOrientationMaskPortrait;
NSUInteger orientations = UIInterfaceOrientationMaskAllButUpsideDown;
if(self.window.rootViewController){
//取出当前显示的控制器
UIViewController *presentedViewController = [self topViewControllerWithRootViewController:self.window.rootViewController];
//按当前控制器支持的方向确定旋转方向(将旋转方向重新交给每个控制器自己控制)
NSLog(@"%s, line = %d",__FUNCTION__,__LINE__);
orientations = [presentedViewController supportedInterfaceOrientations];
}
return orientations;
}
//获取界面最上层的控制器
//- (UIViewController*)topViewController {
// NSLog(@"%s, line = %d",__FUNCTION__,__LINE__);
// return [self topViewControllerWithRootViewController:[UIApplication sharedApplication].keyWindow.rootViewController];
//}
//一层一层的进行查找判断
- (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;
}
}代码中通过 -(UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window 方法将控制器交给自己控制，该方法默认值为 Info.plist 中配置的 Supported interface orientations 项的值。
第2步：在各控制器设置支持的方向
//是否允许旋转(默认允许)
- (BOOL)shouldAutorotate {
return YES;
}
- (UIInterfaceOrientationMask)supportedInterfaceOrientations{
//允许旋转的方向
return UIInterfaceOrientationMaskAll;
}其中 - supportedInterfaceOrientations 方法在 iPad 中默认取值为 UIInterfaceOrientationMaskAll ，即默认支持所有屏幕方向；而 iPhone 跟 iPod Touch 的默认取值为 UIInterfaceOrientationMaskAllButUpsideDown ，即支持除竖屏向下以外的三个方向。
在设备屏幕旋转时，系统会调用 - shouldAutorotate 方法检查当前界面是否支持旋转，只有 - shouldAutorotate 返回 YES 的时候， - supportedInterfaceOrientations 方法才会被调用，以确定是否需要旋转界面。
这个是 TabbarController 中设置的,它会影响关联的 UIViewController 的支持方向，需要在 UIViewController 中进一步设置
//此方法来控制能否横竖屏 控制锁屏
- (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：强制转换控制器方向
- (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;
// 从2开始是因为0 1 两个参数已经被selector和target占用
[invocation setArgument:&val atIndex:2];
[invocation invoke];
}
}这样就可以完成横竖屏的切换。
2、屏幕旋转相应改变视图位置
这里先扩展 UIDeviceOrientation & UIInterfaceOrientation 的知识
UIDeviceOrientation 设备的物理方向
UIDeviceOrientation 即我们手持的移动设备的 Orientation ，是一个三围空间,有六个方向,通过 [UIDevice currentDevice].orientation 获取当前设备的方向。
typedef NS_ENUM(NSInteger, UIDeviceOrientation) {
UIDeviceOrientationUnknown,
UIDeviceOrientationPortrait,
UIDeviceOrientationPortraitUpsideDown, // Device oriented vertically, home button on the top 竖屏向下，即头在下，Home 键在上
UIDeviceOrientationLandscapeLeft, // Device oriented horizontally, home button on the right 横屏头在左，Home键在右
UIDeviceOrientationLandscapeRight, // Device oriented horizontally, home button on the left 横屏头在右，Home键在左
UIDeviceOrientationFaceUp, // Device oriented flat, face up
UIDeviceOrientationFaceDown // Device oriented flat, face down
} ;UIInterfaceOrientation 界面的显示方向
UIInterfaceOrientation 即我们看到的视图的 Orientation ，可以理解为 statusBar 所在的方向，是一个二维空间，有四个方向, 通过 [UIApplication sharedApplication].statusBarOrientation 即状态栏的方向获取当前界面方向。
// 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举值
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),
}由上可以发现：
iOS 6 及之后版本使用的 UIInterfaceOrientationMask 类型来控制屏幕屏幕方向，该类型也新增加了几个枚举取值，可用一个枚举取值来代表多个屏幕方向，使用起来更方便。
注意在 UIInterfaceOrientation 中有注释
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，大意是界面的左转相当于设备的右转，如果设备向左转时就需要内容（即界面）向右转。即：
UIInterfaceOrientationLandscapeLeft = UIDeviceOrientationLandscapeRight
UIInterfaceOrientationLandscapeRight = UIDeviceOrientationLandscapeLeft
下面还会举例说明。
其实 UIDeviceOrientation 与 UIInterfaceOrientation 是两个互不相干的属性，通常情况下会一起出现，在这里正好利用此特性在屏幕旋转后进行重新布局。
第1步：监听 UIDeviceOrientationDidChangeNotification 状态
//监听设备旋转 改变 视图 对应位置
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(deviceOrientationDidChange) name:UIDeviceOrientationDidChangeNotification object:nil];
//用来控制横竖屏时调整视图位置
- (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：竖屏转横屏
界面竖屏 UIInterfaceOrientationPortrait ->横屏 UIInterfaceOrientationLandscapeRight ，设备方向 UIDeviceOrientationPortrait -> UIDeviceOrientationLandscapeLeft ,在设备发生变化这个过程触发 UIDeviceOrientationDidChangeNotification 监听，然后进行重新布局。
3、旋转时状态栏的隐藏与显示
这里只记述旋转时状态栏的变化，由竖屏想横屏变化时状态栏会消失。
//在需要的`UIViewController`设置是否隐藏
- (BOOL)prefersStatusBarHidden {
NSLog(@"%s, line = %d",__FUNCTION__,__LINE__);
return NO;
}4、锁屏
锁屏时，不管系统锁屏是否关闭、Push 或 Present 返回后，界面依然保持不变。
第1步：设置锁屏
- (IBAction)lockAction:(UIButton *)sender {
if (_lockScreen) {
_lockScreen = NO;
[sender setTitle:@"锁定屏幕" forState:UIControlStateNormal];
} else {
_lockScreen = YES;
[sender setTitle:@"解开屏幕" forState:UIControlStateNormal];
}
_lockOrientation = _interOrientation;
}第2步：绕过强转
- (void)interfaceOrientation:(UIInterfaceOrientation)orientation
{
[self isPortrait];
//锁屏情况下 不旋转
if (!_lockScreen) {
[self setInterOrientation:orientation];
}第3步：针对 Push 或 Present 返回后
- (void)viewWillAppear:(BOOL)animated {
if (_lockScreen) {
//记录返回时的界面状态
[self setInterOrientation:_lockOrientation];
} else {
[self isPortrait];
}
}5、 针对特定 UIViewController 方向的支持
-(UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
if ([NSStringFromClass([[self topViewController] class]) isEqualToString:@"FirstViewController"]) {
//横屏
return UIInterfaceOrientationMaskLandscapeRight;
}
//竖屏
return UIInterfaceOrientationMaskPortrait;
}最后的献上 GitHub 代码，还有2个小的 bug ，有兴趣的朋友欢迎来探讨。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持创新互联。
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