我想让我AVAudioPlayer播放一些 mp3 文件。它播放其中一些，但我有一个文件无法播放！
要播放文件，我将其下载到我的设备上的应用程序文件夹中并以这种方式初始化：
[[AVAudioPlayer alloc] initWithContentsOfURL:soundPath error:nil];
如何播放文件？为什么不播放？
文件链接：abc.mp3
编辑：
（这是显示错误的代码。代码中有一个 README。在设备上尝试。）
***.pch
#import <Availability.h>
#ifndef __IPHONE_4_0
#warning "This project uses features only available in iOS SDK 4.0 and later."
#endif
#ifdef __OBJC__
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import <SystemConfiguration/SystemConfiguration.h>
#import <MobileCoreServices/MobileCoreServices.h>
#import <AVFoundation/AVFoundation.h>
#import <AudioToolbox/AudioToolbox.h>
#endif
ViewController.h
#import <UIKit/UIKit.h>
#import "AFNetworking.h"
@interface SCRViewController : UIViewController <AVAudioPlayerDelegate>
{
UIButton *button;
__block UIProgressView *view;
NSOperationQueue *queue;
__block BOOL isFile;
UIButton *play;
NSString *path;
AVAudioPlayer *_player;
}
@end
ViewController.m
#import "ViewController.h"
@implementation SCRViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setBackgroundColor:[UIColor yellowColor]];
[button setFrame:CGRectMake(50, 50, 220, 50)];
[button addTarget:self action:@selector(download) forControlEvents:UIControlEventTouchUpInside];
[button setTitle:@"Download" forState:UIControlStateNormal];
[button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[button setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];
[self.view addSubview:button];
play = [UIButton buttonWithType:UIButtonTypeCustom];
[play setBackgroundColor:[UIColor yellowColor]];
[play setFrame:CGRectMake(50, 150, 220, 50)];
[play addTarget:self action:@selector(play) forControlEvents:UIControlEventTouchUpInside];
[play setTitle:@"Play" forState:UIControlStateNormal];
[play setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[play setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];
[self.view addSubview:play];
self->view = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
self->view.frame = CGRectMake(10, 120, 300, 20);
[self->view setProgress:0];
[self.view addSubview:self->view];
queue = [[NSOperationQueue alloc] init];
isFile = NO;
}
- (void) download
{
[button setBackgroundColor:[UIColor brownColor]];
[button setTitleColor:[UIColor whiteColor] forState:UIControlStateDisabled];
[button setEnabled:NO];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://iwheelbuy.com/abc.mp3"]];
//-------------------------------------------------------
//-------------------------------------------------------
// READ ME
//-------------------------------------------------------
//-------------------------------------------------------
// Test in on device
// I have uploaded another song for you. You can change link to http://iwheelbuy.com/def.mp3 and check the result
// def.mp3 works fine on the device
//-------------------------------------------------------
//-------------------------------------------------------
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
path = [path stringByAppendingPathComponent:@"song"];
if ( [[NSFileManager defaultManager] fileExistsAtPath:path])
[[NSFileManager defaultManager] removeItemAtPath:path error:nil];
operation.outputStream = [NSOutputStream outputStreamToFileAtPath:path append:NO];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject)
{
isFile = YES;
} failure:^(AFHTTPRequestOperation *operation, NSError *error)
{
//
}];
[operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead)
{
CGFloat done = (CGFloat)((int)totalBytesRead);
CGFloat expected = (CGFloat)((int)totalBytesExpectedToRead);
CGFloat progress = done / expected;
self->view.progress = progress;
}];
[queue addOperation:operation];
}
- (void) play
{
if (isFile)
{
NSError *error = nil;
NSURL *url = [NSURL fileURLWithPath:path];
_player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
if(error || !_player)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:[error description] delegate:nil cancelButtonTitle:@"Try def.mp3" otherButtonTitles:nil];
[alert show];
}
else
{
[_player play]; // plays fine
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
}
}
else
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Warning" message:@"Download the file plz" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles: nil];
[alert show];
}
}
@end