iOS音訊和視訊(Audio & Video)

簡介

音訊和視訊在最新的裝置中頗為常見。

將iosAVFoundation.framework和MediaPlayer.framework新增到Xcode專案中，可以讓IOS支援音訊和視訊(Audio & Video)。

例項步驟

1、建立一個簡單的View based application

2、選擇專案檔案、選擇目標，然後新增AVFoundation.framework和MediaPlayer.framework

3、在ViewController.xib中新增兩個按鈕，建立一個用於分別播放音訊和視訊的動作（action）

4、更新ViewController.h,如下所示

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <MediaPlayer/MediaPlayer.h>

@interface ViewController : UIViewController
{
    AVAudioPlayer *audioPlayer;
    MPMoviePlayerViewController *moviePlayer;
    
}
-(IBAction)playAudio:(id)sender;
-(IBAction)playVideo:(id)sender;
@end

5、更新ViewController.m，如下所示

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
}

- (void)didReceiveMemoryWarning
{
   [super didReceiveMemoryWarning];
   // Dispose of any resources that can be recreated.
}
-(IBAction)playAudio:(id)sender{
   NSString *path = [[NSBundle mainBundle]
   pathForResource:@"audioTest" ofType:@"mp3"];
   audioPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:
   [NSURL fileURLWithPath:path] error:NULL];
   [audioPlayer play];
}
-(IBAction)playVideo:(id)sender{
   NSString *path = [[NSBundle mainBundle]pathForResource:
   @"videoTest" ofType:@"mov"];
   moviePlayer = [[MPMoviePlayerViewController 
   alloc]initWithContentURL:[NSURL fileURLWithPath:path]];
   [self presentModalViewController:moviePlayer animated:NO];
}
@end

注意項

需要新增音訊和視訊檔案，以確保獲得預期的輸出

輸出

執行該程式，得到的輸出結果如下

AudioVideo_Output

當我們點選 play video(播放視訊)顯示如下：

video_Output