文 || 張賀
利用AVFoundation框架可以做什么群井？
- 錄音
- 音效
- 播放遠(yuǎn)程 / 本地音樂
- 播放遠(yuǎn)程 / 本地視頻
錄音
錄音使用AVAudioRecorder這個(gè)類來進(jìn)行錄音
#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
@interface ViewController ()
@property (nonatomic,strong) AVAudioRecorder *recorder;
@end
@implementation ViewController
//懶加載
-(AVAudioRecorder *)recorder{
if (_recorder == nil) {
//1.創(chuàng)建沙盒路徑
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
//2.拼接音頻文件
NSString *filePath = [path stringByAppendingPathComponent:@"123.caf"];
//3.轉(zhuǎn)換成url file://
NSURL *url = [NSURL fileURLWithPath:filePath];
//4.設(shè)置錄音的參數(shù)
NSDictionary *settings = @{
/**錄音的質(zhì)量状飞，一般給LOW就可以了
typedef NS_ENUM(NSInteger, AVAudioQuality) {
AVAudioQualityMin = 0,
AVAudioQualityLow = 0x20,
AVAudioQualityMedium = 0x40,
AVAudioQualityHigh = 0x60,
AVAudioQualityMax = 0x7F
};*/
AVEncoderAudioQualityKey : [NSNumber numberWithInteger:AVAudioQualityLow],
AVEncoderBitRateKey : [NSNumber numberWithInteger:16],
AVSampleRateKey : [NSNumber numberWithFloat:8000],
AVNumberOfChannelsKey : [NSNumber numberWithInteger:2]
};
NSLog(@"%@",url);
//第一個(gè)參數(shù)就是你要把錄音保存到哪的url
//第二個(gè)參數(shù)是一些錄音的參數(shù)
//第三個(gè)參數(shù)是錯(cuò)誤信息
self.recorder = [[AVAudioRecorder alloc]initWithURL:url settings:settings error:nil];
}
return _recorder;
}
//開始錄音
- (IBAction)start:(id)sender {
[self.recorder record];
}
//停止錄音
- (IBAction)stop:(id)sender {
[self.recorder stop];
}
@end
音效
- 又稱“短音頻”，通常在程序中的播放時(shí)長為1~2秒
- 在應(yīng)用程序中起到點(diǎn)綴效果书斜，提升整體用戶體驗(yàn)
#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
@interface ViewController ()
@property (nonatomic,assign)SystemSoundID soundID;
@end
@implementation ViewController
-(SystemSoundID)soundID{
if (_soundID == 0) {
//生成soundID
CFURLRef url = (__bridge CFURLRef)[[NSBundle mainBundle]URLForResource:@"buyao.wav" withExtension:nil];
AudioServicesCreateSystemSoundID(url, &_soundID);
}
return _soundID;
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
//播放音效
AudioServicesPlaySystemSound(self.soundID);//不帶震動效果
//AudioServicesPlayAlertSound(<#SystemSoundID inSystemSoundID#>)//帶震動效果
}
@end
播放音樂
播放本地音樂
比如游戲中的“背景音樂”诬辈，一般播放時(shí)間較長
使用AVAudioPlayer只能播放本地音樂
#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
@interface ViewController ()
@property (nonatomic,strong)AVAudioPlayer *player;
@end
@implementation ViewController
-(AVAudioPlayer *)player{
if (_player == nil) {
//1.音樂資源
NSURL *url = [[NSBundle mainBundle]URLForResource:@"235319.mp3" withExtension:nil];
//2.創(chuàng)建AVAudioPlayer對象
_player = [[AVAudioPlayer alloc]initWithContentsOfURL:url error:nil];
//3.準(zhǔn)備播放（緩沖，提高播放的流暢性）
[_player prepareToPlay];
}
return _player;
}
//播放（異步播放）
- (IBAction)play {
[self.player play];
}
//暫停音樂荐吉，暫停后再開始從暫停的地方開始
- (IBAction)pause {
[self.player pause];
}
//停止音樂焙糟，停止后再開始從頭開始
- (IBAction)stop {
[self.player stop];
//這里要置空
self.player = nil;
}
@end
播放遠(yuǎn)程音樂
使用AVPlayer既可以播放本地音樂也可以播放遠(yuǎn)程（網(wǎng)絡(luò)上的）音樂
#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
@interface ViewController ()
@property (nonatomic,strong)AVPlayer *player;
@end
@implementation ViewController
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
//播放音樂
[self.player play];
}
#pragma mark - 懶加載
-(AVPlayer *)player{
if (_player == nil) {
//想要播放遠(yuǎn)程音樂，只要把url換成網(wǎng)絡(luò)音樂就可以了
//NSURL *url = [NSURL URLWithString:@"http://cc.stream.qqmusic.qq.com/C100003j8IiV1X8Oaw.m4a?fromtag=52"];
//1.本地的音樂資源
NSURL *url = [[NSBundle mainBundle]URLForResource:@"235319.mp3" withExtension:nil];
//2.這種方法設(shè)置的url不可以動態(tài)的切換
_player = [AVPlayer playerWithURL:url];
//2.0創(chuàng)建一個(gè)playerItem样屠，可以通過改變playerItem來進(jìn)行切歌
//AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:url];
//2.1這種方法可以動態(tài)的換掉url
//_player = [AVPlayer playerWithPlayerItem:playerItem];
//AVPlayerItem *nextItem = [AVPlayerItem playerItemWithURL:nil];
//通過replaceCurrentItemWithPlayerItem：方法來換掉url穿撮，進(jìn)行切歌
//[self.player replaceCurrentItemWithPlayerItem:nextItem];
}
return _player;
}
@end
播放本地 / 遠(yuǎn)程視頻
使用AVPlayer也可以播放本地 / 遠(yuǎn)程視頻
這種方式只能播放視頻，上面是不能點(diǎn)擊的痪欲，邏輯需要代碼去實(shí)現(xiàn)
#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
@interface ViewController ()
@property(nonatomic,strong)AVPlayer *player;
@end
@implementation ViewController
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
//播放視頻
[self.player play];
}
-(AVPlayer *)player{
if (_player == nil) {
//播放遠(yuǎn)程視頻
NSURL *url = [NSURL URLWithString:@"http://v1.mukewang.com/a45016f4-08d6-4277-abe6-bcfd5244c201/L.mp4"];
//加載本地視頻源
//NSURL *url = [[NSBundle mainBundle]URLForResource:@"xiaohuangren.mp4" withExtension:nil];
//創(chuàng)建播放器
AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:url];
_player = [AVPlayer playerWithPlayerItem:playerItem];
//顯示視頻的層AVPlayerLayer
AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:_player];
//視頻的寬高比例一般為16 : 9
playerLayer.frame = CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.width * 9 / 16);
//把playerLayer添加到控制器的層上
[self.view.layer addSublayer:playerLayer];
}
return _player;
}
@end
使用AVPlayerViewController播放視頻
AVPlayerViewController屬于AVKit框架悦穿，應(yīng)包含#import <AVKit/AVKit.h>
iOS9.0以后AVPlayerViewController取代了
MPMoviePlayerController和MPMoviePlayerViewController
#import "ViewController.h"
#import <AVKit/AVKit.h>
#import <AVFoundation/AVFoundation.h>
@interface ViewController ()
@property (nonatomic,strong)AVPlayerViewController *playerVC;
@end
@implementation ViewController
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
//以modal的樣式彈出來,只能全屏顯示
[self presentViewController:self.playerVC animated:YES completion:nil];
}
-(AVPlayerViewController *)playerVC{
if (_playerVC == nil) {
//視頻源
NSURL *url = [NSURL URLWithString:@"http://v1.mukewang.com/a45016f4-08d6-4277-abe6-bcfd5244c201/L.mp4"];
//
AVPlayerItem *platerItem = [AVPlayerItem playerItemWithURL:url];
//
AVPlayer *player = [[AVPlayer alloc]initWithPlayerItem:platerItem];
//創(chuàng)建一個(gè)視頻播放的控制器
//這個(gè)類實(shí)在AVKit框架下的
_playerVC = [[AVPlayerViewController alloc]init];
//設(shè)置player
_playerVC.player = player;
}
return _playerVC;
}
@end
AVPlayerViewController播放的視頻張這樣
