全屏方案及各自的优缺点

作者: 追风_少年 | 来源:发表于2017-05-22 14:49 被阅读0次

根据一篇博客以及人家的思路重新写了这个 demo 博客地址见本文末尾。优缺点和实现思路都写在了 demo 中，demo见 GitHub

首先需要新建播放视频所在的 View 在此我以一个 imageView 代替, 其代码如下


#import <UIKit/UIKit.h>

typedef NS_ENUM(NSInteger, PlayViewState)
{
    PlayViewStateSmallScreen, // 小屏状态
    PlayViewStateAnimating,   // 动画中的状态
    PlayViewStateFullScreen   // 全屏状态
};

@interface PlayView : UIImageView

@property (nonatomic, assign)PlayViewState state;
@property (nonatomic, weak)UIView * playViewParent; // 记录父视图
@property (nonatomic, assign)CGRect playViewFrame;  // 记录在父视图中的 frame

- (instancetype)initWithFrame:(CGRect)frame;
@end

#import "PlayView.h"

@implementation PlayView

- (instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        self.image = [UIImage imageNamed:@"timg"];
        self.contentMode = UIViewContentModeScaleAspectFit;
        self.userInteractionEnabled = YES;
    }
    return self;
}
@end

第一种实现方案：播放器所在的 View 的父视图在 window 和控制器的 view之间相互切换

#import <UIKit/UIKit.h>

@interface FirstViewController : UIViewController

@end

#import "FirstViewController.h"
#import "Header.h"
#import "PlayView.h"
@interface FirstViewController ()
@property (nonatomic, weak)PlayView * playView;
@end

@implementation FirstViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.title = @"First";
    self.view.backgroundColor = [UIColor whiteColor];
    PlayView * playView = [[PlayView alloc] initWithFrame:CGRectMake(0, 64, KSCREEN_WIDTH, KSCREEN_WIDTH * 9 / 16)];
    playView.backgroundColor = [UIColor blackColor];
    self.playView = playView;
    
    [self.view addSubview:playView];
    

    UITapGestureRecognizer * tap =[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapHundle:)];
    [self.playView addGestureRecognizer:tap];
}

/*
 * 思路：从小屏进入全屏时，将播放器所在的view放置到window上，用transform的方式做一个旋转动画，最终让view完全覆盖window。 从全屏回到小屏时，用transform的方式做旋转动画，最终让播放器所在的view回到原先的parentView
 
 * 优缺点：这种方式在实现上相对简单，因为仅仅旋转了播放器所在的view，view controller和device的方向均始终为竖直（portrait）。但最大的问题就是全屏时status bar的方向依然是竖直的，虽然之前通过全屏时隐藏statusBar来掩盖了这个问题，但这同时导致了用户无法在视频全屏时看到时间、网络情况等，体验有待改善。
 */


- (void)tapHundle:(UITapGestureRecognizer *)sender
{
    if (sender.state == UIGestureRecognizerStateEnded) {
        if (self.playView.state == PlayViewStateFullScreen) {
            [self exitFullScreen]; // 小屏
        }
        if (self.playView.state == PlayViewStateSmallScreen) {
            [self enterFullScreen]; // 全屏
        }
    }
}




/*
 * 全屏
 */
- (void)enterFullScreen
{
    if (self.playView.state != PlayViewStateSmallScreen)
    {
        return;
    }
    self.playView.state = PlayViewStateAnimating;
    self.playView.playViewParent = self.playView.superview;
    self.playView.playViewFrame = self.playView.frame;
    
    
    // 计算控制器的 View 上的 palyView的 frame 相对于 window的 frame
    CGRect rectInWindow = [self.view convertRect:self.playView.frame toView:[UIApplication sharedApplication].keyWindow];
    [self.playView removeFromSuperview];
    self.playView.frame = rectInWindow;
    [[UIApplication sharedApplication].keyWindow addSubview:self.playView];
    __weak typeof(self) weakSelf = self;
    [UIView animateWithDuration:0.5 animations:^{
        weakSelf.playView.transform = CGAffineTransformMakeRotation(M_PI_2     );
        weakSelf.playView.bounds = CGRectMake(0, 0, CGRectGetHeight(weakSelf.playView.playViewParent.bounds), CGRectGetWidth(weakSelf.playView.playViewParent.bounds));
        weakSelf.playView.center = CGPointMake(CGRectGetMidX(weakSelf.playView.superview.bounds), CGRectGetMidY(weakSelf.playView.superview.bounds));
        
    } completion:^(BOOL finished) {
        weakSelf.playView.state = PlayViewStateFullScreen;
    }];
    
}
/*
 * 退出全屏
 */
- (void)exitFullScreen
{
    if (self.playView.state != PlayViewStateFullScreen ) {
        return;
    }
    self.playView.state = PlayViewStateAnimating;
    __weak typeof(self) weakSelf = self;
    // 计算播放器父View 上的 playView 的 frame 相对于窗口的 frame
    CGRect frame = [self.playView.playViewParent convertRect:self.playView.playViewFrame toView:[UIApplication sharedApplication].keyWindow];
    [UIView animateWithDuration:0.5 animations:^{
        
        weakSelf.playView.transform = CGAffineTransformIdentity;
        weakSelf.playView.frame = frame;
    } completion:^(BOOL finished) {
        [weakSelf.playView removeFromSuperview];
        weakSelf.playView.frame = weakSelf.playView.playViewFrame;
        [weakSelf.playView.playViewParent addSubview:weakSelf.playView];
        weakSelf.playView.state = PlayViewStateSmallScreen;
    }];
}

/*
 * 屏幕旋转参考
 * http://www.2cto.com/kf/201504/393303.html
 */
- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
    return UIInterfaceOrientationMaskPortrait;
}

第二种实现方案：模态一个控制器，在模态出的控制器上全屏放置播放器的 view, 因此需要两个类退出全屏和进入全屏做动画的类，其代码如下
1、进入全屏做转场动画的类

#import <UIKit/UIKit.h>
@class PlayView;

@interface EnterFullScreenTransition : NSObject <UIViewControllerAnimatedTransitioning>

- (instancetype)initWithPlayView:(PlayView *)playView;
@end

#import "EnterFullScreenTransition.h"

@interface EnterFullScreenTransition ()

@property (nonatomic, strong)UIView * playView;
@end
@implementation EnterFullScreenTransition


- (instancetype)initWithPlayView:(PlayView *)playView
{
    if (self = [super init]) {
        self.playView = (UIView *)playView;
    }
    return self;
}

- (NSTimeInterval)transitionDuration:(nullable id <UIViewControllerContextTransitioning>)transitionContext
{
    return 0.5;
}

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
    
    // 取到将要被模态的控制器
    UIViewController * presentVc = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    // 取到将要被模态的 view
    UIView * presentView = [transitionContext viewForKey:UITransitionContextToViewKey];
    
    // containerView是动画过程中提供的暂时容器。切换时的动画将在这个容器中进行
    CGRect smallPlayViewFrame = [[transitionContext containerView] convertRect:self.playView.bounds fromView:self.playView];
    
    presentView.bounds = self.playView.bounds;
    presentView.transform = CGAffineTransformMakeRotation(M_PI_2);
    presentView.center = CGPointMake(CGRectGetMidX(smallPlayViewFrame), CGRectGetMidY(smallPlayViewFrame));
    
    [[transitionContext containerView] addSubview:presentView];
    
    self.playView.frame  = presentView.bounds;
    [presentView  addSubview:self.playView];
    
    
    CGRect presentViewFinalFrame = [transitionContext finalFrameForViewController:presentVc];
    [UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0.0 options:UIViewAnimationOptionLayoutSubviews animations:^{
        presentView.transform = CGAffineTransformIdentity;
        presentView.frame = presentViewFinalFrame;
        self.playView.frame = presentView.bounds;
    } completion:^(BOOL finished) {
        [transitionContext completeTransition:YES];
    }];

}

2、退出全屏做转场动画的类

#import <UIKit/UIKit.h>
@class PlayView;

@interface ExitFullScreenTransition : NSObject <UIViewControllerAnimatedTransitioning>

- (instancetype)initWithPlayView:(PlayView *)playView;
@end

#import "ExitFullScreenTransition.h"
#import "PlayView.h"
@interface ExitFullScreenTransition ()

@property (nonatomic, weak)PlayView * playView;
@end

@implementation ExitFullScreenTransition

- (instancetype)initWithPlayView:(PlayView *)playView
{
    if (self = [super init]) {
        self.playView = playView;
    }
    return self;
}


- (NSTimeInterval)transitionDuration:(nullable id <UIViewControllerContextTransitioning>)transitionContext
{
    return 0.5;
}

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
    UIView * fromView = [transitionContext viewForKey:UITransitionContextFromViewKey];
    CGRect smallPlayViewFrame = [[transitionContext containerView] convertRect:self.playView.playViewFrame fromView:self.playView.playViewParent];
    
    [UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0.0 options:UIViewAnimationOptionLayoutSubviews animations:^{
                         fromView.transform = CGAffineTransformIdentity;
                         fromView.frame = smallPlayViewFrame;
                         self.playView.frame = fromView.bounds;
                     }
    completion:^(BOOL finished) {
                         self.playView.frame = self.playView.playViewFrame;
                         [self.playView.playViewParent addSubview:self.playView];
                         [fromView removeFromSuperview];
                         [transitionContext completeTransition:YES];
    }];

    
}
@end

3、实现方案所需要的两个类（小屏显示、全屏显示 j即被模态的类）


#import <UIKit/UIKit.h>

@interface SecondViewController : UIViewController

@end

#import "SecondViewController.h"
#import "PlayView.h"
#import "Header.h"
#import "FullScreenViewController.h"
#import "EnterFullScreenTransition.h"
#import "ExitFullScreenTransition.h"
@interface SecondViewController ()<UIViewControllerTransitioningDelegate>
@property (nonatomic, weak)PlayView * playView;
@property (nonatomic, weak)FullScreenViewController * fullScreenVC;
@end

@implementation SecondViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    self.title = @"Second";
    
    PlayView * playView = [[PlayView alloc] initWithFrame:CGRectMake(0, 64, KSCREEN_WIDTH, KSCREEN_WIDTH * 9 / 16)];
    playView.backgroundColor = [UIColor blackColor];
    self.playView = playView;
    
    [self.view addSubview:playView];
    
    UITapGestureRecognizer * tap =[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapHundle:)];
    [self.playView addGestureRecognizer:tap];
}

/*
 * 思路二：
 * 在一个只支持Portrait的ViewController上，present一个只支持Landscape的ViewController，通过改写ViewController之间的转场动画，既能高度自定义全屏动画，也能让StatusBar在视频全屏时横向显示。
 * 缺点一：部分控件依靠 window 尺寸布局，导致全屏动画过程中布局错乱
   原因：present 过程中，ios 对 presentingVC 的 frame 经过了两次变化
      1、由于 window 的 bounds 从竖直（height -> width）的状态转为横向（width ->）的状态由于 autoresing 的作用presentingVC的 view 也变成了横向状态
      2、系统给presentingVC的 view 增加了 transform 使其旋转了90度 让 presentingVC 的 view 看起来还是竖直方向
   结果：如果一个presentingVC的 view的子视图根据 window 布局，在第一次变化的时候宽高已经对调，这样就会导致第二次变化时这个子视图布局错乱。
 * 缺点二：屏幕渲染 bug 导致半边黑屏的问题，腾讯体育APP 就有半边黑屏的问题
 * 缺点三：UIScreen 长宽互换的 bug（iOS10）
 */


- (void)tapHundle:(UITapGestureRecognizer *)sender
{
    if (sender.state == UIGestureRecognizerStateEnded) {
        if (self.playView.state == PlayViewStateSmallScreen) {
            [self enterFullScreen]; // 全屏
        }
        if (self.playView.state == PlayViewStateFullScreen) {
            [self exitFullScreen];  // 退出全屏
        }
    }
}
/*
 * 全屏
 */
- (void)enterFullScreen
{
    if (self.playView.state != PlayViewStateSmallScreen) {
        return;
    }
    self.playView.state = PlayViewStateAnimating;
    
    // 记录最初的 frame 和父视图
    self.playView.playViewFrame= self.playView.frame;
    self.playView.playViewParent = self.view;
    [self.playView removeFromSuperview];
    
    FullScreenViewController * fullScreenVC = [[FullScreenViewController alloc] init];

    fullScreenVC.transitioningDelegate = self;
    __weak typeof(self) weakSelf = self;
    fullScreenVC.modalPresentationStyle = UIModalPresentationOverFullScreen;
    fullScreenVC.modalPresentationCapturesStatusBarAppearance = true;
   [self presentViewController:fullScreenVC animated:YES completion:^{
       weakSelf.playView.state = PlayViewStateFullScreen;
   }];
    
    self.fullScreenVC = fullScreenVC;
    
    
    
}


- (void)exitFullScreen
{
    if (self.playView.state != PlayViewStateFullScreen ) {
        return;
    }
    self.playView.state = PlayViewStateAnimating;
    __weak typeof(self) weakSelf = self;
    [self.fullScreenVC dismissViewControllerAnimated:YES completion:^{
        weakSelf.playView.state = PlayViewStateSmallScreen;
    }];
}


- (UIInterfaceOrientationMask)supportedInterfaceOrientations {

    return UIInterfaceOrientationMaskPortrait;
}


- (nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source
{
    return [[EnterFullScreenTransition alloc] initWithPlayView:self.playView];
}


- (nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed
{
    return [[ExitFullScreenTransition alloc] initWithPlayView:self.playView];
}
@end

#import <UIKit/UIKit.h>

@interface FullScreenViewController : UIViewController

@end


#import "FullScreenViewController.h"
#import "Header.h"


@interface FullScreenViewController ()

@end

@implementation FullScreenViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor redColor];
    
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
    return UIInterfaceOrientationMaskLandscapeLeft;
}

- (BOOL)prefersStatusBarHidden {
    return NO;
}
@end

第三种实现方案：在方案一的基础上，调用UIApplication的setStatusBarOrientation:animated:方法来改变statusBar的方向同时重写当前的ViewController的shouldAutorotate方法，返回NO
关于其中的坑点我已在代码中有所标注

#import <UIKit/UIKit.h>

@interface ThirdViewController : UIViewController

@end


#import "ThirdViewController.h"
#import "Header.h"
#import "PlayView.h"
@interface ThirdViewController ()
@property (nonatomic, weak)PlayView * playView;
@end

@implementation ThirdViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.title = @"Third";
    self.view.backgroundColor = [UIColor whiteColor];
    PlayView * playView = [[PlayView alloc] initWithFrame:CGRectMake(0, 64, KSCREEN_WIDTH, KSCREEN_WIDTH * 9 / 16)];
    playView.backgroundColor = [UIColor blackColor];
    self.playView = playView;
    
    [self.view addSubview:playView];
    
    
    UITapGestureRecognizer * tap =[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapHundle:)];
    [self.playView addGestureRecognizer:tap];
}

/*
 * 思路：从小屏进入全屏时，将播放器所在的view放置到window上，用transform的方式做一个旋转动画，最终让view完全覆盖window。 从全屏回到小屏时，用transform的方式做旋转动画，最终让播放器所在的view回到原先的parentView
 
 * 优缺点：这种方式在实现上相对简单，因为仅仅旋转了播放器所在的view，view controller和device的方向均始终为竖直（portrait）。但最大的问题就是全屏时status bar的方向依然是竖直的，虽然之前通过全屏时隐藏statusBar来掩盖了这个问题，但这同时导致了用户无法在视频全屏时看到时间、网络情况等，体验有待改善。
 */


- (void)tapHundle:(UITapGestureRecognizer *)sender
{
    if (sender.state == UIGestureRecognizerStateEnded) {
        if (self.playView.state == PlayViewStateFullScreen) {
            [self exitFullScreen]; // 小屏
        }
        if (self.playView.state == PlayViewStateSmallScreen) {
            [self enterFullScreen]; // 全屏
        }
    }
}




/*
 * 全屏
 */
- (void)enterFullScreen
{
    if (self.playView.state != PlayViewStateSmallScreen)
    {
        return;
    }
    self.playView.state = PlayViewStateAnimating;
    self.playView.playViewParent = self.playView.superview;
    self.playView.playViewFrame = self.playView.frame;
    
    
    // 计算控制器的 View 上的 palyView的 frame 相对于 window的 frame
    CGRect rectInWindow = [self.view convertRect:self.playView.frame toView:[UIApplication sharedApplication].keyWindow];
    [self.playView removeFromSuperview];
    self.playView.frame = rectInWindow;
    [[UIApplication sharedApplication].keyWindow addSubview:self.playView];
    __weak typeof(self) weakSelf = self;
    [UIView animateWithDuration:0.5 animations:^{
        weakSelf.playView.transform = CGAffineTransformMakeRotation(M_PI_2     );
        weakSelf.playView.bounds = CGRectMake(0, 0, CGRectGetHeight(weakSelf.playView.playViewParent.bounds), CGRectGetWidth(weakSelf.playView.playViewParent.bounds));
        weakSelf.playView.center = CGPointMake(CGRectGetMidX(weakSelf.playView.superview.bounds), CGRectGetMidY(weakSelf.playView.superview.bounds));
        
    } completion:^(BOOL finished) {
        weakSelf.playView.state = PlayViewStateFullScreen;
    }];
    [self refreshStatusBarOrientation:UIInterfaceOrientationLandscapeRight];
    
}
/*
 * 退出全屏
 */
- (void)exitFullScreen
{
    if (self.playView.state != PlayViewStateFullScreen ) {
        return;
    }
    self.playView.state = PlayViewStateAnimating;
    __weak typeof(self) weakSelf = self;
    // 计算播放器父View 上的 playView 的 frame 相对于窗口的 frame
    CGRect frame = [self.playView.playViewParent convertRect:self.playView.playViewFrame toView:[UIApplication sharedApplication].keyWindow];
    [UIView animateWithDuration:0.5 animations:^{
        
        weakSelf.playView.transform = CGAffineTransformIdentity;
        weakSelf.playView.frame = frame;
    } completion:^(BOOL finished) {
        [weakSelf.playView removeFromSuperview];
        weakSelf.playView.frame = weakSelf.playView.playViewFrame;
        [weakSelf.playView.playViewParent addSubview:weakSelf.playView];
        weakSelf.playView.state = PlayViewStateSmallScreen;
    }];
    [self refreshStatusBarOrientation:UIInterfaceOrientationPortrait];
}


- (void)refreshStatusBarOrientation:(UIInterfaceOrientation)interfaceOrientation {
    [[UIApplication sharedApplication] setStatusBarOrientation:interfaceOrientation animated:YES];
}

/* 如果只有 viewController 的话, 以下方法一定会走，但如果项目中既有 TabVC、又有 NavVC 要在父类中也实现如下方法,否则，以下方法不会走，会被拦截
 
 * tabVC: - (BOOL)shouldAutorotate
            {
                return self.selectedViewController.shouldAutorotate;
            }
 
 * navVC: - (BOOL)shouldAutorotate
            {
                return self.topViewController.shouldAutorotate;
            }
 */

- (BOOL)shouldAutorotate
{
    return NO;
}

最后：
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2、参考链接

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