19

我正在使用 AVAudioPlayer 框架，我有几种声音，一次播放一种。当声音播放完毕后，我希望应用程序做一些事情。我尝试使用 audioPlayerDidFinishPlaying 在第一个声音结束时执行该操作，但我无法将其用于第二个声音，因为我遇到了重新定义错误。我可以使用 NSTimeInterval 来获取声音的持续时间吗？

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

@interface ViewController : UIViewController {  
UIButton        *begin;
UIWindow        *firstTestWindow;
UIWindow        *secondTestWindow;
AVAudioPlayer   *player;
NSTimeInterval  duration;
}  

@property (nonatomic, retain) IBOutlet UIButton     *begin;
@property (nonatomic, retain) IBOutlet UIWindow     *firstTestWindow;
@property (nonatomic, retain) IBOutlet UIWindow     *secondTestWindow;
@property (nonatomic, retain)         AVAudioPlayer   *player;
@property (readonly)                   NSTimeInterval  duration;


- (IBAction)begin:(id)sender;
- (IBAction)doTapScreen:(id)sender;

@end



//ViewController.m
#import "ViewController.h"

@implementation ViewController

@synthesize begin, player, firstTestWindow, secondTestWindow;

//first sound
- (IBAction)begin:(id)sender; {

    [firstTestWindow makeKeyAndVisible];
    NSString *soundFilePath =
    [[NSBundle mainBundle] pathForResource: @"Tone1"
                                    ofType: @"mp3"];

    NSURL *fileURL = [[NSURL alloc] initFileURLWithPath: soundFilePath];

    AVAudioPlayer *newPlayer =
    [[AVAudioPlayer alloc] initWithContentsOfURL: fileURL
                                           error: nil];
    [fileURL release];
    self.player = newPlayer;
    [newPlayer release];

    [player prepareToPlay];
    [self.player play];

}

//If user does not do anything by the end of the sound go to secondWindow
- (void) audioPlayerDidFinishPlaying: (AVAudioPlayer *) player
                    successfully: (BOOL) flag {
                               if (flag==YES) {
    [secondWindow makeKeyAndVisible];
    }
}

//second sound
- (IBAction)doTapScreen:(id)sender {
    //When user touches the screen, either play the sound or go to the next window
    if (self.player.playing) {
    [self.player stop];
    [thirdWindow makeKeyAndVisible];
    }

    else {
    NSString *soundFilePath =
    [[NSBundle mainBundle] pathForResource: @"Tone2"
                ofType: @"mp3"];

    NSURL *fileURL = [[NSURL alloc] initFileURLWithPath: soundFilePath];

    AVAudioPlayer *newPlayer =
    [[AVAudioPlayer alloc] initWithContentsOfURL: fileURL
                                           error: nil];
    [fileURL release];
    self.player = newPlayer;
    [newPlayer release];

    [player prepareToPlay];
    [self.player play];

}
}
4

2 回答 2

25

当声音播放完毕后，我希望应用程序做一些事情。

然后将自己设置为代表并响应audioPlayerDidFinishPlaying:successfully:。

在您展示的代码片段中，您完成了第 2 步，但没有完成第 1 步：您没有将自己设置为委托人。

我试着用applicationDidFinishLaunching在第一个声音结束时做动作……</p>

脑袋放屁？该方法与播放声音没有任何关系。

…，但我无法将它用于第二个声音，因为我遇到了重新定义错误。

嗯？您是否实现了两次或其他方法而不是仅比较方法主体中的播放器对象？

如果您显示您收到的确切错误消息，这将有所帮助。

于 2009-07-11T03:18:22.243 回答
2

斯威夫特 3：

func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
        print("sound file finished")
    }
于 2017-09-12T02:45:09.450 回答