之前看过很多app的登录页面，会有背景在循环播放一段视频，觉得非常酷炫。
然后自己研究了许久，终于弄出点样子，跟大家分享一下。
（gif图做的很烂）
beijingVideo.2018-09-26 15_52_32.gif
1.创建父类视图控制器
这是.h文件
#import <UIKit/UIKit.h>
//视频播放时的窗口属性enum
enum ScalingMode {
resize,
resizeAspect,
resizeAspectFill //默认推荐这个属性
};
@interface FKCVideoViewController : UIViewController
@property (nonatomic,strong) NSURL * contentURL ; //视频文件地址
@property (nonatomic,assign) CGRect videoFrame ; //播放器的frame
@property (nonatomic,assign) CGFloat startTime ; //视频开始时间
@property (nonatomic,assign) CGFloat duration ; //循环时间 不写的话就默认是视频总长度
@property (nonatomic,strong) UIColor * backgroundColor ; //播放器背景颜色
@property (nonatomic,assign) BOOL sound ; //是否开启声音
@property (nonatomic,assign) CGFloat alpha ; //透明度
@property (nonatomic,assign) BOOL alwaysRepeat ; //是否一致循环
@property (nonatomic,assign) enum ScalingMode fillMode ; //视频播放时的窗口属性
@end
然后再到.m文件里来
头文件一定要导入哦~
#import <AVKit/AVKit.h>
#import <MediaPlayer/MediaPlayer.h>
@interface FKCVideoViewController ()
@property (nonatomic,strong) AVPlayerViewController * moviePlayer ; //播放控制器本体啦
@property (nonatomic,assign) CGFloat moviePlayerSoundLevel ; //控制音量的（有点冗余）
@end
实现一些刚才定义的属性的set方法
-(void)setBackgroundColor:(UIColor *)backgroundColor
{
self.view.backgroundColor = backgroundColor ;
}
-(void)setSound:(BOOL)sound
{
if (sound) {
self.moviePlayerSoundLevel = 1.0 ;
}
else
{
self.moviePlayerSoundLevel = 0.0 ;
}
}
-(void)setAlpha:(CGFloat)alpha
{
self.moviePlayer.view.alpha = alpha ;
}
-(void)setAlwaysRepeat:(BOOL)alwaysRepeat
{
if (alwaysRepeat) {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playerItemDidReachEnd) name:AVPlayerItemDidPlayToEndTimeNotification object:self.moviePlayer.player.currentItem] ;
}
}
-(void)setFillMode:(enum ScalingMode)fillMode
{
switch (fillMode) {
case resize:
self.moviePlayer.videoGravity = AVLayerVideoGravityResize ;
break;
case resizeAspect:
self.moviePlayer.videoGravity = AVLayerVideoGravityResizeAspect ;
break;
case resizeAspectFill:
self.moviePlayer.videoGravity = AVLayerVideoGravityResizeAspectFill ;
break;
default:
self.moviePlayer.videoGravity = AVLayerVideoGravityResizeAspectFill ;
break;
}
}
//对应 setAlwaysRepeat 的监听
-(void)playerItemDidReachEnd
{
[self.moviePlayer.player seekToTime:kCMTimeZero] ;
[self.moviePlayer.player play] ;
}
然后最重要的一步来了
-(void)setContentURL:(NSURL *)contentURL
{
self.moviePlayer = [[AVPlayerViewController alloc]init] ; //这个刚开始没写 一直没有视图，但是不一定放在这里是最好的。
[self setFKCMoviePlayer:contentURL] ; //在填写视频地址时，完成播放器的设置。
}
为了不堵塞主线程，这里用到了GCD多线程
-(void)setFKCMoviePlayer:(NSURL *)url
{
VideoCutter * videoCutter = [VideoCutter new] ; //这是一个对视频进行一次处理的类，等下上代码
[videoCutter cropVideoWithUrl:url andStartTime:self.startTime andDuration:self.duration andCompletion:^(NSURL *videoPath, NSError *error) {
if ([videoPath isKindOfClass: [NSURL class]]) {
dispatch_queue_t globalDispatchQueueDefault = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(globalDispatchQueueDefault, ^{
dispatch_async(dispatch_get_main_queue(), ^{
self.moviePlayer.player = [[AVPlayer alloc] initWithURL:videoPath] ;
[self.moviePlayer.player play] ;
self.moviePlayer.player.volume = self.moviePlayerSoundLevel ;
});
}) ;
}
}] ;
}
然后是两个生命周期的方法
-(void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated] ;
self.moviePlayer.view.frame = self.videoFrame ;
self.moviePlayer.showsPlaybackControls = false ;
[self.view addSubview:self.moviePlayer.view] ;
[self.view sendSubviewToBack:self.moviePlayer.view] ;
}
-(void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated] ;
[[NSNotificationCenter defaultCenter] removeObserver:self] ;
}
viewDidLoad里面啥都没写哦
然后再回到刚才说的那个类VideoCutter
2.视频处理类VideoCutter
这里是.h文件
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
@interface VideoCutter : NSObject
-(void)cropVideoWithUrl:(NSURL *)url andStartTime:(CGFloat)startTime andDuration:(CGFloat)duration andCompletion:(void(^)(NSURL * videoPath,NSError * error))task ;
@end
再来到.m文件里
好像总共也就这一个方法。。。
-(void)cropVideoWithUrl:(NSURL *)url andStartTime:(CGFloat)startTime andDuration:(CGFloat)duration andCompletion:(void(^)(NSURL * videoPath,NSError * error))task{
dispatch_queue_t globalDispatchQueueDefault = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
//由于本人也是参考其他大神的作品发挥的，所以可能理解的不是很准确。
dispatch_async(globalDispatchQueueDefault, ^{
AVURLAsset * asset = [[AVURLAsset alloc] initWithURL:url options:nil] ;
AVAssetExportSession * exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:@"AVAssetExportPresetHighestQuality"] ;
//这里是得到一个视频转码类AVAssetExportSession 然后质量是最高
NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, true) ;
NSString * outputURL = paths.firstObject ;
NSFileManager * manager = [NSFileManager defaultManager] ;
[manager createDirectoryAtPath:outputURL withIntermediateDirectories:true attributes:nil error:nil] ;
outputURL = [outputURL stringByAppendingPathComponent:@"output.mp4"] ;
//拿到转码后的视频地址
[manager removeItemAtPath:outputURL error:nil] ;
if ([exportSession isKindOfClass:[AVAssetExportSession class]]) {
exportSession.outputURL = [[NSURL alloc] initFileURLWithPath:outputURL] ;
exportSession.shouldOptimizeForNetworkUse = true ;
exportSession.outputFileType = AVFileTypeMPEG4 ;
Float64 duration64 = duration ;
Float64 startTime64 = startTime ;
CMTime start = CMTimeMakeWithSeconds(startTime64, 600) ;
CMTime duration = CMTimeMakeWithSeconds(duration64, 600) ;
CMTimeRange range = CMTimeRangeMake(start, duration) ;
exportSession.timeRange = range ;
[exportSession exportAsynchronouslyWithCompletionHandler:^{
switch (exportSession.status) {
case AVAssetExportSessionStatusCompleted:
task(exportSession.outputURL,nil) ;
//转换ok后把视频地址block回去
break;
case AVAssetExportSessionStatusFailed:
NSLog(@"%@",exportSession.error) ;
break;
case AVAssetExportSessionStatusCancelled:
NSLog(@"%@",exportSession.error) ;
break;
default:
NSLog(@"default case") ;
break;
}
}] ;
}
dispatch_async(dispatch_get_main_queue(), ^{
//回到主线程
});
}) ;
}
现在整个视频播放器已经写好了，调用！
在viewController.h里面
一定要继承刚才写的播放器
#import <UIKit/UIKit.h>
#import "FKCVideoViewController.h"
@interface ViewController:FKCVideoViewController
@end
然后回到.m文件里
NSString * videoPath = [[NSBundle mainBundle] pathForResource:@"spotify" ofType:@"mp4"] ;
//视频地址
NSURL * videoUrl = [[NSURL alloc] initFileURLWithPath:videoPath] ;
self.videoFrame = self.view.frame ; //设置播放器的frame
self.fillMode = resizeAspectFill ; //设置播放器填充属性
self.alwaysRepeat = true ; //是否一致循环
self.sound = false ; //是否有音效
self.startTime = 2.0 ; //开始时间
self.alpha = 0.8 ; //透明度
self.contentURL = videoUrl ; //把地址给到播放器，顺带也设置了
self.view.userInteractionEnabled = NO ; //关闭用户交互
OK大功告成！
小白不会写文章，有遗漏的地方欢迎指出。
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