使用AVAudioPlayer iOS 7播放音频 [英] Playing back audio using AVAudioPlayer iOS 7

问题描述

我正在努力遵循Apple有关使用 AVAudioPlayer 类播放小型$ code> .wav 文件的文档。我也不确定基本音频播放需要什么工具箱。到目前为止我已导入：

I'm struggling to follow Apple's documentation regarding playing back a small .wav file using the AVAudioPlayer class. I'm also not sure what toolboxes I need for basic audio playback. So far I have imported:

AVFoundation.framework
CoreAudio.framework
AudioToolbox.framework

这是我的代码 .h 和 .m ：

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

@interface ViewController : UIViewController <AVAudioPlayerDelegate>

- (IBAction)playAudio:(id)sender;

@end

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (IBAction)playAudio:(id)sender {

    NSLog(@"Button was Pressed");

    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"XF_Loop_028" ofType:@"wav"];
    NSURL *fileURL = [[NSURL alloc] initFileURLWithPath:filePath];

    // create new audio player
    AVAudioPlayer *myPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:fileURL error:nil];
    [myPlayer play];

}
@end

我似乎没有有任何错误。但是，我没有收到任何音频。

I don't seem to have any errors. However, I am not getting any audio.

推荐答案

您在这里遇到ARC问题。当myPlayer超出范围时，它正在被清理。创建一个强大的属性，分配AVAudioPlayer，你可能已经全部设置好了！

You're having an ARC issue here. myPlayer is being cleaned up when it's out of scope. Create a strong property, assign the AVAudioPlayer and you're probably all set!

@property(nonatomic, strong) AVAudioPlayer *myPlayer;

...

// create new audio player
self.myPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:fileURL error:nil];
[self.myPlayer play];

这篇关于使用AVAudioPlayer iOS 7播放音频的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！