Question

我有一个表视图来显示声音文件以及每个原型单元格中的播放按钮。当用户点击播放按钮时，我正在尝试播放与所选单元格合并的声音文件。

在代码中，一旦用户点击它，我就会更改UIButton的{{1}}。完成播放后，它将重置为默认按钮图像。但是，如果用户在播放当前曲目时单击下一个单元格按钮，则无法更改先前选择的UIImage。

请告诉我我的代码出了什么问题。

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *dirPath = [paths objectAtIndex:0];
    NSArray *fileList = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:dirPath error:nil];

    // UITableViewPlayer *cellPlayer;
    _cellPlayer = [tableView dequeueReusableCellWithIdentifier:@"cell"];

    _cellPlayer.btnPlay.tag = indexPath.row;
    _cellPlayer.btnPlay.titleLabel.hidden = YES;

    [_cellPlayer.btnPlay addTarget:self action:@selector(playCurrenTrack:) forControlEvents:UIControlEventTouchUpInside];
    _cellPlayer.pView.tag = indexPath.row;


    _cellPlayer.songTitle.text = [fileList objectAtIndex:indexPath.row];

    return _cellPlayer;

}



-(void)playCurrenTrack : (id) sender{


    UIButton *clicked = (UIButton *) sender;

    NSInteger rowNumber = clicked.tag;

    // reset the default button
    for (int i = 0; i < DirctoryList.count; i++) {

        UITableViewPlayer *cellPlayer = [self.myTableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:i inSection:0]];

        [cellPlayer.btnPlay setImage:[UIImage imageNamed:@"play.png"] forState:UIControlStateNormal];

    }

    NSIndexPath *myIP = [NSIndexPath indexPathForRow:rowNumber inSection:0];


    UITableViewPlayer *currentView = (UITableViewPlayer *)[myTableView  cellForRowAtIndexPath:myIP];

    if(rowNumber == playerIndex && [player isPlaying]){
        [currentView.btnPlay setImage:[UIImage imageNamed:@"play.png"] forState:UIControlStateNormal];
        [player pause];
        return;
    }else if(rowNumber == playerIndex && isPlayerBusy){
         [currentView.btnPlay setImage:[UIImage imageNamed:@"pause.png"] forState:UIControlStateNormal];

        [player play];
        return;

    }

    [player stop];


    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSArray *fileListAct = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectory error:nil];


    NSString *FinalFile= [NSString stringWithFormat:@"%@",fileListAct[rowNumber]];
    NSString *strippedContent = [FinalFile stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSString *FinalPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:strippedContent];


    NSURL * soundFileURL = [NSURL fileURLWithPath:FinalPath];


    NSError *error;
    player = [[AVAudioPlayer alloc]
              initWithContentsOfURL:soundFileURL
              error:&error];

    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
    [[AVAudioSession sharedInstance] setActive: NO error: nil];

    if (error)
    {
        NSLog(@"Error in audioPlayer: %@",
              [error localizedDescription]);
    } else {

        player.delegate = self;
        [player prepareToPlay];
        // set the index for checking current playing track
        playerIndex = clicked.tag;
        isPlayerBusy = TRUE;
        [player play];

        [currentView.btnPlay setImage:[UIImage imageNamed:@"pause.png"] forState:UIControlStateNormal];
        /*
        [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(UpdateProgressBar:) userInfo:nil repeats:YES];
        */
    }
}

Answer 1

做两件事：

首先cellForRowAtIndexPath selectedImage _cellPlayer.btnPlay内[_cellPlayer.btnPlay setImage:@"selectedImage" forState:UIControlStateSelected];为：{/ p>
```
playCurrenTrack
```

然后在[_cellPlayer.btnPlay setSelected:YES];中将其设置为已选中。

PT_CLAIMS                IN      CLIM_BEAN_TAB,
PO_CLAIMS_CUSROR         OUT     SYS_REFCURSOR

当你玩其他列表的项目时，不要忘记重新调整它。 ; - ）

Answer 2

这是工作代码可能会帮助某人。这对我有用

- (void)viewDidLoad{

    playerIndex = -1;
    prevSelection = nil;

}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{


    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString

    *dirPath = [paths objectAtIndex:0];
    NSArray *fileList = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:dirPath error:nil];

    // UITableViewPlayer *cellPlayer;
    cellPlayer = [tableView dequeueReusableCellWithIdentifier:@"cell"];

    cellPlayer.btnPlay.tag = indexPath.row;
    cellPlayer.btnPlay.titleLabel.hidden = YES;


    [cellPlayer.btnPlay addTarget:self action:@selector(playCurrenTrack:) forControlEvents:UIControlEventTouchUpInside];
    cellPlayer.pView.tag = indexPath.row;


    cellPlayer.songTitle.text = [fileList objectAtIndex:indexPath.row];

    return cellPlayer;

}

-(void)playCurrenTrack : (id) sender{


    UIButton *clicked = (UIButton *) sender;

    NSInteger rowNumber = clicked.tag;


    NSIndexPath *myIP = [NSIndexPath indexPathForRow:rowNumber inSection:0];


    UITableViewPlayer *currentView = (UITableViewPlayer *)[myTableView  cellForRowAtIndexPath:myIP];

    if(rowNumber == playerIndex){

        if([player isPlaying]){

            [currentView.btnPlay setImage:[UIImage imageNamed:@"pause.png"] forState:UIControlStateNormal];
            [player pause];
        }else{
            [currentView.btnPlay setImage:[UIImage imageNamed:@"play.png"] forState:UIControlStateNormal];

            [player play];

        }


    }else{

        if([player isPlaying]){
            [player stop];
        }


        if (prevSelection != nil) {
            UITableViewPlayer *prevView = (UITableViewPlayer *)[myTableView  cellForRowAtIndexPath:prevSelection];
            // make your priviousView player stop code here using priviousView & reload that indexpath
            [prevView.btnPlay setImage:[UIImage imageNamed:@"play.png"] forState:UIControlStateNormal];

            [myTableView reloadRowsAtIndexPaths:@[prevSelection] withRowAnimation:UITableViewRowAnimationNone];

        }

        prevSelection = nil;

        [currentView.btnPlay setImage:[UIImage imageNamed:@"pause.png"] forState:UIControlStateNormal];


    }

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSArray *fileListAct = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectory error:nil];


    NSString *FinalFile= [NSString stringWithFormat:@"%@",fileListAct[rowNumber]];
    NSString *strippedContent = [FinalFile stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSString *FinalPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:strippedContent];


    NSURL * soundFileURL = [NSURL fileURLWithPath:FinalPath];


    NSError *error;
    player = [[AVAudioPlayer alloc]
              initWithContentsOfURL:soundFileURL
              error:&error];

    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
    [[AVAudioSession sharedInstance] setActive: NO error: nil];

    if (error)
    {
        NSLog(@"Error in audioPlayer: %@",
              [error localizedDescription]);
    } else {

        player.delegate = self;
        [player prepareToPlay];
        // set the index for checking current playing track
        playerIndex = clicked.tag;
        //set prevCell
        prevSelection = myIP;
        isPlayerBusy = TRUE;
        [player play];


        [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(UpdateProgressBar:) userInfo:nil repeats:YES];
    }


}

Answer 3

因为你必须存储以前的单元索引路径。为NSIndexPath *priviousSelected;

之类的类创建一个NSIndexPath对象框架

并修改你的playCurrenTrack，如下所示，为UITableViewPlayer *priviousView编写停止图像逻辑而不是注释//让你的privfulView播放器停止

-(void)playCurrenTrack : (id) sender{


    UIButton *clicked = (UIButton *) sender;

    NSInteger rowNumber = clicked.tag;

    // reset the default button
    for (int i = 0; i < DirctoryList.count; i++) {

        UITableViewPlayer *cellPlayer = [self.myTableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:i inSection:0]];

        [cellPlayer.btnPlay setImage:[UIImage imageNamed:@"play.png"] forState:UIControlStateNormal];

    }

    NSIndexPath *myIP = [NSIndexPath indexPathForRow:rowNumber inSection:0];


    UITableViewPlayer *currentView = (UITableViewPlayer *)[myTableView  cellForRowAtIndexPath:myIP];

    if(rowNumber == playerIndex && [player isPlaying]){
        [currentView.btnPlay setImage:[UIImage imageNamed:@"play.png"] forState:UIControlStateNormal];
        [player pause];
        priviousSelected = nil;
        return;
    }else if(rowNumber == playerIndex && isPlayerBusy){
        [currentView.btnPlay setImage:[UIImage imageNamed:@"pause.png"] forState:UIControlStateNormal];

        if (priviousSelected != nil) {
            UITableViewPlayer *priviousView = (UITableViewPlayer *)[myTableView  cellForRowAtIndexPath:priviousSelected];
            // make your priviousView player stop code here using priviousView & reload that indexpath

        }
        priviousSelected = myIP;
        [player play];
        return;

    }

    [player stop];


    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSArray *fileListAct = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectory error:nil];


    NSString *FinalFile= [NSString stringWithFormat:@"%@",fileListAct[rowNumber]];
    NSString *strippedContent = [FinalFile stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSString *FinalPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:strippedContent];


    NSURL * soundFileURL = [NSURL fileURLWithPath:FinalPath];


    NSError *error;
    player = [[AVAudioPlayer alloc]
              initWithContentsOfURL:soundFileURL
              error:&error];

    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
    [[AVAudioSession sharedInstance] setActive: NO error: nil];

    if (error)
    {
        NSLog(@"Error in audioPlayer: %@",
              [error localizedDescription]);
    } else {

        player.delegate = self;
        [player prepareToPlay];
        // set the index for checking current playing track
        playerIndex = clicked.tag;
        isPlayerBusy = TRUE;
        [player play];

        [currentView.btnPlay setImage:[UIImage imageNamed:@"pause.png"] forState:UIControlStateNormal];
        /*
         [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(UpdateProgressBar:) userInfo:nil repeats:YES];
         */
    }
}

无需重新加载UITableView就无法更改原型单元UIButton图像

3 个答案: