iPhone - 設置按鈕回到初始狀態

Question

我創建了一個使用播放和停止圖像的按鈕，我想要的是當我按播放，聲音結束時，停止圖像應該回去播放，但它不工作，任何人都可以幫助這裏請。乾杯。

- (IBAction)play { 

    if(clicked == 0){ 
     clicked = 1; 
     NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/TEST.wav", [[NSBundle mainBundle] resourcePath]]]; 

     NSError *error; 
     audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error]; 
     audioPlayer.numberOfLoops = 0; 


     [audioPlayer play]; 
     [start setImage:[UIImage imageNamed:@"stop.png"] forState:UIControlStateNormal]; 

    } 
    else{ 
     [audioPlayer release]; 
     clicked = 0; 
     [start setImage:[UIImage imageNamed:@"pla.png"] forState:UIControlStateNormal]; 
    } 

} 

//If user does not do anything by the end of the sound set the button to start 
- (void) audioPlayerDidFinishPlaying: (AVAudioPlayer *) player 
         successfully: (BOOL) flag { 
    if (flag==YES) { 
     [start setImage:[UIImage imageNamed:@"pla.png"] forState:UIControlStateNormal]; 
    } 
} 

這是我的.h文件

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

int clicked; 

@interface _0_RabbanasViewController : UIViewController { 

    IBOutlet UIScrollView *scroll; 
    AVAudioPlayer *audioPlayer; 
    IBOutlet UIButton *start; 

    IBOutlet UIImage *iPla; 
    IBOutlet UIImage *iStop; 
    BOOL successfully; 

} 

- (IBAction)play; 
- (IBAction)next; 

@end 

Answer 1

確保您的AVAudioPlayer實例的委託設置爲self：

[audioPlayer setDelegate:self]; 

，並在頭文件，訂閱AVAudioPlayerDelegate協議：

<AVAudioPlayerDelegate> 

現在它應該工作。

編輯：在這裏訂閱AVAudioPlayerDelegate協議：

@interface _0_RabbanasViewController : UIViewController <AVAudioPlayerDelegate> { 

IBOutlet UIScrollView *scroll; 
AVAudioPlayer *audioPlayer; 
IBOutlet UIButton *start; 
... 

希望現在的工作。 :)

EDIT2：設置audioPlayer授人以自我位置：

audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error]; 
audioPlayer.numberOfLoops = 0; 
[audioPlayer setDelegate:self]; 
[audioPlayer play]; 

EDIT3：補充一點：

- (void) audioPlayerDidFinishPlaying: (AVAudioPlayer *) player 
         successfully: (BOOL) flag { 
    if (flag==YES) { 
     clicked = 0; 
     [start setImage:[UIImage imageNamed:@"pla.png"] forState:UIControlStateNormal]; 
    } 
}