iOS视频播放解决方案

2016-12-21 王建伟 iOS开发

此文章主要讲解项目中视频播放测试过程中遇到的问题，解决方案以及视频播放功能的封装DEMO;

1.整个应用的要求是竖屏，但是在视频播放界面要求可以转动屏幕

解决方案1:设置全局无法转动，仅支持竖屏，在视频界面时候检测屏幕转动，然后旋转重置视频界面视图

注册检测屏幕旋转通知：[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientChange:) name:UIDeviceOrientationDidChangeNotification object:nil];

实现方法:

- (void)orientChange:(NSNotification *)noti
{
    UIDeviceOrientation orient = [UIDevice currentDevice].orientation;
    [videoAnimationView viewChangeWithDeviceOrientation:orient];
    [self navigationViewChangeWithDeviceOrientation:orient];
    switch (orient)
    {
        case UIDeviceOrientationPortrait:
        {
            playerLayer.transform = CATransform3DIdentity;
            playerLayer.frame=WGFrame(0, 64, WGScreen_W, 200);
            self.barHidden=NO;
        }
            break;
        case UIDeviceOrientationLandscapeLeft:
        {
            playerLayer.transform = CATransform3DMakeRotation(M_PI/2, 0, 0, 1);
            playerLayer.frame=WGFrame(0, 0, WGScreen_W, WGScreen_H);
            self.barHidden=YES;
        }
            break;
        case UIDeviceOrientationPortraitUpsideDown:
        {
            playerLayer.transform = CATransform3DIdentity;
            playerLayer.frame=WGFrame(0, 64, WGScreen_W, 200);
            self.barHidden=NO;
        }
            break;
        case UIDeviceOrientationLandscapeRight:
        {
            playerLayer.transform = CATransform3DMakeRotation(-M_PI/2, 0, 0, 1);
            playerLayer.frame=WGFrame(0, 0, WGScreen_W, WGScreen_H);
            self.barHidden=YES;
        }
            break;
        default:
            break;
    }
}

此方案需要在界面布局上下文章，试图旋转后控件的布局需要调整，而且存在一个问题，状态栏旋转方法没有找到，只能在横屏的时候隐藏状态栏，好处是整个app都旋转状态不需要调整，不会对其他界面布局造成影响

补充：状态栏风格调整和隐藏方法,在控制器中重写方法

风格调整（黑色和白色）-(UIStatusBarStyle)preferredStatusBarStyle{

1.return UIStatusBarStyleLightContent;//白色

2.return UIStatusBarStyleDefault;//黑色

}

隐藏：-(BOOL)perfersStatusHidden{

return YES;//隐藏

return NO;//不隐藏

}

方案2:在AppDelegate中设置界面是否旋转，在视频界面的时候改变参数让应用可旋转，然后当视频界面消失时候再将参数改回来让应用不可旋转

在AppDelegate中重写方法：

 -(UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window{
    if (_allowRotation == 1) {
                return UIInterfaceOrientationMaskAllButUpsideDown;
            }else{
                return (UIInterfaceOrientationMaskPortrait);
            }
}

_allowRotation 是AppDelegate的属性,方便改变选装状态

然后在视频控制器-(void)viewDidLoad方法中，将allowRotation设置成 1

再在视频控制器-(void)dealloc方法中，将allowRotation重新设置成 0

重写方法-(void)viewWillLayoutSubviews来检测屏幕转动，并且刷新界面布局

-(void)viewWillLayoutSubviews{
     videoAnimationView.center=WGPoint(WGScreen_W/2, 131);
    _navigationView.frame=WGFrame(0, 0, WGScreen_W, 64);
    titleLabel.frame=WGFrame(0, 20, WGScreen_W, 44);
    /*
     ＊横屏＊
     */
    if(WGGetWidth(self.view)>WGGetHeight(self.view)){
     playerLayer.frame=WGFrame(0, 0, WGScreen_W, WGScreen_H);
        [videoPlayControllerView refreshViewWhenVer:NO];
        videoPlayControllerView.frame=WGFrame(0, WGScreen_H-40, WGScreen_W, 40);
        [self.view bringSubviewToFront:_navigationView];
    }
    /*
     ＊竖屏＊
     */
    else{
        playerLayer.frame=WGFrame(0, 64, WGScreen_W, 220);
        videoPlayControllerView.frame=WGFrame(0, 244, WGScreen_W, 40);
        [videoPlayControllerView refreshViewWhenVer:YES];
        self.barHidden=NO;
    }
}

注意在点击返回键的时候，当屏幕处于横屏状态的时候需要将横屏变成竖屏，不让其他界面布局会受到影响

-(void)backButtonEvent:(UIButton*)sender{
    if(WGGetWidth(self.view)>WGGetHeight(self.view)){
        [[UIDevice currentDevice] setValue:[NSNumber numberWithInteger:UIDeviceOrientationPortrait] forKey:@"orientation"];
    }
    else{
    [self.navigationController popViewControllerAnimated:YES];
    }
}

下面附上个人封装的视频播放功能:

//
//  WGVideoPlayer.h
//  Espeaker1.0
//
//  Created by 王建伟 on 16/12/20.
//  Copyright © 2016年 王建伟. All rights reserved.
//
#import <Foundation/Foundation.h>
#import <AVFoundation/AVFoundation.h>
#import "Macro.h"
typedef NS_ENUM(NSInteger, WGPlayerMode) {
    WGPlayerModeList = 0,       // 列表 (默认)
    WGPlayerModeSingle,         // 单曲循环
    WGPlayerModeRandom         // 随机顺序
};
typedef NS_ENUM(NSInteger, WGPlayerStatus) {
    WGPlayerPlay = 0,       // 列表 (默认)
    WGPlayerPause         // 单曲循环
};
@protocol WGPlayerDelegate <nsobject>
@optional
/*
 ＊播放时被调用，频率为1s，告知当前播放进度和播放时间＊
 */
-(void)playNotifyProcess:(CGFloat)percent currentSecond:(NSUInteger)currentSecond withTotal:(CGFloat)total;
/*
 ＊播放时被调用，告知当前播放器的缓冲进度＊
 */
-(void)playNotifyCacheProcess:(CGFloat)percent;
/*
 ＊播放器将要进行播放＊
 */
-(void)playerWillPlaying;
@end
@interface WGVideoPlayer : NSObject
/*
 ＊代理属性＊
 */
@property(nonatomic,weak)id<wgplayerdelegate>delegate;
/*
 ＊播放器＊
 */
@property(nonatomic,strong)AVPlayer*player;
@property(nonatomic,strong)NSMutableArray*playList;
@property(nonatomic,strong)AVPlayerItem*currentItem;
@property(nonatomic,assign)WGPlayerStatus playerStatus;
@property(nonatomic,assign)CGFloat duration;
/*
 ＊视频播放器单例＊
 */
+(instancetype)shareVideoPlayer;
/*
 ＊播放声音列表＊
 */
-(void)playWithCuttentPlay:(NSString*)currentPlay withList:(NSArray*)playList;
/*
 ＊暂停当前播放＊
 */
-(void)pausePlay;
/*
 ＊恢复当前播放＊
 */
-(void)resumePlay;
/*
 ＊停止当前播放＊
 */
-(void)stopPlay;
/*
 ＊播放下一首＊
 */
-(void)playNextObject;
/*
 ＊播放上一首＊
 */
-(void)playPrevObject;
/*
 ＊设置播放器从特定时间播放＊
 */
-(void)seekToTime:(CGFloat)percent;
/*
 ＊设置当前播放器下一首选择模式：单曲循环／列表循环／随机＊
 */
-(void)setPlayerMode:(WGPlayerMode)playerMode;
@end

//
//  WGVideoPlayer.m
//  Espeaker1.0
//
//  Created by 王建伟 on 16/12/20.
//  Copyright © 2016年 王建伟. All rights reserved.
//
#import "WGVideoPlayer.h"
@implementation WGVideoPlayer
+(instancetype)shareVideoPlayer{
    static WGVideoPlayer*videoPlayer;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        videoPlayer=[[WGVideoPlayer alloc]init];
        videoPlayer.player=[[AVPlayer alloc]init];
    });
    return videoPlayer;
}
-(void)playWithCuttentPlay:(NSString *)currentPlay withList:(NSArray *)playList{
for (id object in playList) {
        NSURL*url=[NSURL URLWithString:object];
        AVPlayerItem*item=[[AVPlayerItem alloc]initWithURL:url];
        [self.playList addObject:item];
     if([currentPlay isEqualToString:object]){
         self.currentItem=item;
         [self.player replaceCurrentItemWithPlayerItem:item];
        }
    }
    [self.player play];
    [self createObserver];
    [self createPeriodicTimeObserver];
}
-(void)createObserver{
    [self.player.currentItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];
    [self.player.currentItem addObserver:self forKeyPath:@"loadedTimeRanges" options:NSKeyValueObservingOptionNew context:nil];
}
-(void)removeObserver{
    [self.player.currentItem removeObserver:self forKeyPath:@"status"];
    [self.player.currentItem removeObserver:self forKeyPath:@"loadedTimeRanges"];
}
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context{
    if ([keyPath isEqualToString:@"status"]) {
        switch (self.player.status) {
            case AVPlayerStatusUnknown:
                NSLog(@"未知状态，此时不能播放");
                break;
            case AVPlayerStatusReadyToPlay:
            {
                self.playerStatus=WGPlayerPlay;
                [self.delegate playerWillPlaying];
                NSLog(@"准备完毕，可以播放");
            }
                break;
            case AVPlayerStatusFailed:
                NSLog(@"加载失败，网络或者服务器出现问题");
                break;
            default:
                break;
        }
    }
    if ([keyPath isEqualToString:@"loadedTimeRanges"]) {
        NSArray * array = self.player.currentItem.loadedTimeRanges;
        CMTimeRange timeRange = [array.firstObject CMTimeRangeValue]; //本次缓冲的时间范围
        NSTimeInterval totalBuffer = CMTimeGetSeconds(timeRange.start) + CMTimeGetSeconds(timeRange.duration); //缓冲总长度
        [self.delegate playNotifyCacheProcess:totalBuffer/CMTimeGetSeconds(self.player.currentItem.duration)];
    }
}
-(void)createPeriodicTimeObserver{
    WGSelf;
   [self.player addPeriodicTimeObserverForInterval:CMTimeMake(1.0, 1.0) queue:dispatch_get_main_queue() usingBlock:^(CMTime time) {
     float current = CMTimeGetSeconds(time);
     float total = CMTimeGetSeconds(weakSelf.currentItem.duration);
     if (current) {
         [weakSelf.delegate playNotifyProcess:current/total currentSecond:current withTotal:total];
     }
 }];
}
-(void)pausePlay{
    [self.player pause];
    self.playerStatus=WGPlayerPause;
}
-(void)resumePlay{
    [self.player play];
    self.playerStatus=WGPlayerPlay;
}
-(void)playNextObject{
    [self removeObserver];
    for (int i=0; i<self.playList.count; i++) { if (self.currentItem==self.playList[i]) { if(i==(self.playList.count-1)){ self.currentItem=self.playList[0]; } else{ self.currentItem=self.playList[i+1]; } [self.player replaceCurrentItemWithPlayerItem:self.currentItem]; [self createObserver]; break; } } } -(void)playPrevObject{ for (int i=0; i<self.playList.count; i++) { if (self.currentItem==self.playList[i]) { if(i==0){ self.currentItem=self.playList.lastObject; } else{ self.currentItem=self.playList[i-1]; } [self.player replaceCurrentItemWithPlayerItem:self.currentItem]; } } } -(void)seekToTime:(CGFloat)percent{ CGFloat m=percent*CMTimeGetSeconds(self.player.currentItem.duration); [self.player.currentItem seekToTime:CMTimeMake(m, 1.0)]; } -(NSMutableArray *)playList{ if(!_playList){ _playList=[NSMutableArray array]; } return _playList; } @end

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