iOS：我的声音文件无法在 PickerViewController 中播放

Posted 2023-02-24

【中文标题】iOS：我的声音文件无法在 PickerViewController 中播放

【英文标题】：iOS : My sound file can't play in PickerViewController

【发布时间】：2012-01-03 10:01:42

【问题描述】：

我有一个带有多个声音应用程序的音乐播放器，它使用 pickerView 控制器，但是当我尝试构建应用程序时，声音没有发出。任何人都可以帮我解决我的代码问题吗？这是我的故障排除代码。

.H 文件

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


@interface ViewController : UIViewController <UIPickerViewDelegate, UIPickerViewDataSource, AVAudioPlayerDelegate> 

    UIPickerView       *picker;
    UILabel            *musicTitle;
    NSMutableArray     *musicList;
    AVAudioPlayer      *audioPlayer;





@property (nonatomic, retain) IBOutlet UIPickerView *picker;
@property (nonatomic, retain) IBOutlet UILabel *musicTitle;
@property (nonatomic, retain) NSMutableArray *musicList;

-(IBAction)playSelectedMusic:(id)sender;


@end

.M 文件

     - (void)viewDidLoad
        
            [super viewDidLoad];

            musicList = [[NSMutableArray alloc] initWithObjects:@"music1",@"music2",@"music3",@"music4",@"music5",
                        @"music6",nil];
        

    -(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row
          inComponent:(NSInteger)component
    



        if ([[musicList objectAtIndex:row] isEqual:@"music1"])
        


            NSURL *path = [[NSBundle mainBundle] URLForResource:@"music1" withExtension:@"mp3"];
            AVAudioPlayer *theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL:path error:NULL];


            theAudio.delegate = self;
            [theAudio play];

            NSString *resultString = [[NSString alloc] initWithFormat:
                                      @"music1",
                                      [musicList objectAtIndex:row]];
            musicTitle.text = resultString;


        

-(IBAction)playSelectedMusic:(id)sender

    how do i call the didSelectRow & put it here ?

【参考方案1】：

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row
      inComponent:(NSInteger)component

尝试设置pickerview.delegate = self;

一旦你为pickerview设置了它的委托，就会自动调用你不需要>playSelected音乐按钮，我希望。

【讨论】：

我尝试设置 pickerview.delegate = self;我在构建时收到此错误。找不到函数指针 CreateAudio

我尝试设置 pickerview.delegate = self;我在构建时收到此错误。在我的控制台中它说：Cannot find function pointer CreateAudio for factory in CFBundle/CFPlugIn /Audio/Plug-Ins/HAL/usb-audio.com.plugin>（捆绑，未加载）

请查看此链接discussions.apple.com/thread/2220669?start=0&tstart=0

您好，问题现已解决。但是，我需要动作按钮。我该怎么做？ -(IBAction)playSelectedMusic:(id)sender 我如何调用 didSelectRow 并把它放在这里？