ios - 运行 AVFoundation/AVAudioPlayer 框架时出现 XCode 链接器错误

Question

所以我正在尝试一个简单的应用程序来播放一个简单的 mp3，出于某种原因，无论我尝试什么，我都会遇到同样的错误。每当我包含 AVFoundation/AVAudioPlayer 时它就无法运行，它会在我身上崩溃。但是一旦我删除了那个框架，它就可以正常工作了。请帮忙。

这是我收到的错误..

    ld: warning: ignoring file /Users/nnamdiokeke/Desktop/Play/AVFoundation.framework/AVFoundation, file was built for unsupported file format ( 0xce 0xfa 0xed 0xfe 0x c 0x 0 0x 0 0x 0 0x 9 0x 0 0x 0 0x 0 0x 6 
0x 0 0x 0 0x 0 ) which is not the architecture being linked (i386): /Users/nnamdiokeke/Desktop/Play/AVFoundation.framework/AVFoundation
    Undefined symbols for architecture i386:
      "_OBJC_CLASS_$_AVAudioPlayer", referenced from:
          objc-class-ref in ViewController.o
    ld: symbol(s) not found for architecture i386
    clang: error: linker command failed with exit code 1 (use -v to see invocation)

代码贴在下面。

头文件

//
//  ViewController.h
//  Play
//
//  Created by Nnamdi Okeke on 9/13/12.
//  Copyright (c) 2012 Nnamdi Okeke. All rights reserved.
//

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

@interface ViewController : UIViewController <AVAudioPlayerDelegate> {

    AVAudioPlayer *song;
    NSURL *songlink;
}

 @property (nonatomic, retain) AVAudioPlayer *song;

-(IBAction)play:(id)sender;

@end

执行文件

//
//  ViewController.m
//  Play
//
//  Created by Nnamdi Okeke on 9/13/12.
//  Copyright (c) 2012 Nnamdi Okeke. All rights reserved.
//

#import "ViewController.h"
#import <AVFoundation/AVAudioPlayer.h>


@implementation ViewController


- (void)viewDidLoad
{
    songlink = [NSURL fileURLWithPath:[[NSBundle mainBundle]pathForResource:@"A4Hood" ofType:@"mp3"]];
    song = [[AVAudioPlayer alloc] initWithContentsOfURL:songlink error:nil];
    song.delegate = self;
    //[song play];

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

-(IBAction)play:(id)sender {
    songlink = [NSURL fileURLWithPath:[[NSBundle mainBundle]pathForResource:@"A4Hood" ofType:@"mp3"]];
    song = [[AVAudioPlayer alloc] initWithContentsOfURL:songlink error:nil];
    song.delegate = self;
    [song play];


}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

@end

Answer 1

it fails to run whenever i include AVFoundation/AVAudioPlayer

因为仅包含头文件是不够的 - 您必须再次链接 AVFoundation.framework，否则动态加载器如何知道从何处加载不在您的二进制文件本身中的符号？因此，您必须将 AVFoundation 框架添加到 Xcode 中的项目中。

更多关于为什么这是必要的 here .