iphone - セルのテキストをクリックしたときにセルからテキストを削除する方法

Question

こんにちは、「さらにセルをロード」をクリックしてテーブルのレコードを表示しているときに問題が発生しました。問題は、[セルをさらにロード] をクリックすると、テーブルがさらに 2 つのレコードをロードしてから、さらにテキストをロードする必要があることです。さらに2つのレコードをテーブルにロードする必要があり、これによりさらにテキストが5番目のセルに移動します。しかし、私の場合、問題は、3番目の位置でさらにセルをロードをクリックすると5番目の位置にも移動しますが、3番目のセルレコードではロードされず、3番目のセルにテキストが表示されます。この問題を処理する方法を教えてください。これはコードです

#import "RootViewController.h"
#import "XMLAppDelegate.h"
#import "song.h"
#import "BookDetailViewController.h"
@implementation RootViewController
@synthesize mylabel,mylabel1,mylabel2,spinner,cell;
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if([myarray count]>pageSize)
    {
        return pageSize+1;
    }
    return  myarray.count;

}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 75;
}

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

    static NSString *CellIdentifier = @"cell";

    cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];


        song *asong = [appDelegate.artists objectAtIndex:indexPath.row];

        NSData *data=[NSData dataWithContentsOfURL:[NSURL URLWithString:[myarray objectAtIndex:indexPath.row ]]];

        UIImage *image=[UIImage imageWithData:data];
        if(indexPath.row<pageSize)
        {    
            UIImageView *imageView=[[UIImageView alloc]initWithFrame:CGRectMake(5, 10, 60, 60)];
            imageView.image=image;
            [cell addSubview:imageView];

            CGRect CellFrame1 = CGRectMake(65, 10, 220, 45);
            mylabel1 = [[UILabel alloc] initWithFrame:CellFrame1];
            mylabel1.text = asong.title;

            mylabel1.font = [UIFont boldSystemFontOfSize:12];
            mylabel1.textColor = [UIColor blackColor];
            [cell.contentView addSubview:mylabel1];
            CGRect CellFrame2 = CGRectMake(65, 47, 150, 25);
            mylabel2 = [[UILabel alloc] initWithFrame:CellFrame2];
            mylabel2.text = asong.artist;

            mylabel2.font = [UIFont systemFontOfSize:12];
            [cell.contentView addSubview:mylabel2];




            CGRect CellFrame = CGRectMake(255, 3, 60, 7);
            mylabel = [[UILabel alloc] initWithFrame:CellFrame];
            mylabel.text = asong.duration;
            mylabel.textColor = [UIColor blueColor];
            mylabel.font = [UIFont boldSystemFontOfSize:10];
            [cell.contentView addSubview:mylabel];
        }
        else 
        {
            cell.textLabel.text = @"load more";

            spinner = [[UIActivityIndicatorView alloc] 
                       initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];


            cell.accessoryView = spinner;

            [spinner startAnimating];
            [spinner performSelector:@selector(stopAnimating) withObject:nil afterDelay:1];        [spinner release];

        }
    }






    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

        return cell;
}   


- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    // Navigation logic -- create and push a new view controller

    if (indexPath.row==pageSize) 
    {

        pageSize=pageSize+2;
        [cell reloadInputViews];
        [tableView reloadData];

    }

    /* else if(bdvController == nil)
        bdvController = [[BookDetailViewController alloc] initWithNibName:@"BookDetailView" bundle:[NSBundle mainBundle]];

    song *asong = [appDelegate.artists objectAtIndex:indexPath.row];

    bdvController.aartist = asong;

    [self.navigationController pushViewController:bdvController animated:YES];*/
}



- (void)viewDidLoad {
    [super viewDidLoad];
    pageSize =2;
    // Uncomment the following line to add the Edit button to the navigation bar.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
    myarray = [[NSMutableArray alloc] initWithObjects:@"http://api.androidhive.info/music/images/adele.png",@"http://api.androidhive.info/music/images/eminem.png",@"http://api.androidhive.info/music/images/mj.png",@"http://api.androidhive.info/music/images/rihanna.png",@"http://api.androidhive.info/music/images/arrehman.png",@"http://api.androidhive.info/music/images/alexi_murdoch.png",@"http://api.androidhive.info/music/images/dido.png",@"http://api.androidhive.info/music/images/enrique.png",@"http://api.androidhive.info/music/images/ennio.png",@"http://api.androidhive.info/music/images/backstreet_boys.png",@"http://api.androidhive.info/music/images/adele.png",@"http://api.androidhive.info/music/images/eminem.png",@"http://api.androidhive.info/music/images/mj.png",@"http://api.androidhive.info/music/images/rihanna.png",@"http://api.androidhive.info/music/images/arrehman.png",@"http://api.androidhive.info/music/images/alexi_murdoch.png",@"http://api.androidhive.info/music/images/dido.png",@"http://api.androidhive.info/music/images/enrique.png",@"http://api.androidhive.info/music/images/ennio.png",@"http://api.androidhive.info/music/images/backstreet_boys.png",@"http://api.androidhive.info/music/images/adele.png",@"http://api.androidhive.info/music/images/eminem.png",@"http://api.androidhive.info/music/images/mj.png",@"http://api.androidhive.info/music/images/rihanna.png",@"http://api.androidhive.info/music/images/arrehman.png",@"http://api.androidhive.info/music/images/alexi_murdoch.png",@"http://api.androidhive.info/music/images/dido.png",@"http://api.androidhive.info/music/images/enrique.png",@"http://api.androidhive.info/music/images/ennio.png",@"http://api.androidhive.info/music/images/backstreet_boys.png", nil];
    appDelegate = (XMLAppDelegate *)[[UIApplication sharedApplication] delegate];

    self.title = @"Songs";
}



/*
// Override to support editing the list
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {

    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Delete the row from the data source
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:YES];
    }   
    if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }   
}
*/


/*
// Override to support conditional editing of the list
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
    // Return NO if you do not want the specified item to be editable.
    return YES;
}
*/


/*
// Override to support rearranging the list
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
}
*/


/*
// Override to support conditional rearranging of the list
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
    // Return NO if you do not want the item to be re-orderable.
    return YES;
}
*/

/*
- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
}
*/
/*
- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
}
*/
/*
- (void)viewWillDisappear:(BOOL)animated {
}
*/
/*
- (void)viewDidDisappear:(BOOL)animated {
}
*/

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
    // Release anything that's not essential, such as cached data
}


- (void)dealloc {
    [bdvController release];
    [appDelegate release];
    [super dealloc];
}


@end

score 0 · Accepted Answer

以下をお試しください。

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

    if(indexPath.row<pageSize) {
        song *asong = [appDelegate.artists objectAtIndex:indexPath.row];

        static NSString *CellIdentifier = @"cell";

        cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
        if (cell == nil) {
            cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];

            UIImageView *imageView=[[UIImageView alloc]initWithFrame:CGRectMake(5, 10, 60, 60)];
            imageView.tag = 1;
            [cell addSubview:imageView];

            CGRect CellFrame1 = CGRectMake(65, 10, 220, 45);
            mylabel1 = [[UILabel alloc] initWithFrame:CellFrame1];
            mylabel1.tag = 2;

            mylabel1.font = [UIFont boldSystemFontOfSize:12];
            mylabel1.textColor = [UIColor blackColor];
            [cell.contentView addSubview:mylabel1];
            CGRect CellFrame2 = CGRectMake(65, 47, 150, 25);
            mylabel2 = [[UILabel alloc] initWithFrame:CellFrame2];
            mylabel2.tag = 2;

            mylabel2.font = [UIFont systemFontOfSize:12];
            [cell.contentView addSubview:mylabel2];

            CGRect CellFrame = CGRectMake(255, 3, 60, 7);
            mylabel = [[UILabel alloc] initWithFrame:CellFrame];
            mylabel.tag = 2;
            mylabel.textColor = [UIColor blueColor];
            mylabel.font = [UIFont boldSystemFontOfSize:10];
            [cell.contentView addSubview:mylabel];
        }
        UIImageView *imageView = [cell viewWithTag:1];
        UILabel *mylabel1 = [cell viewWithTag:1];
        UILabel *mylabel2 = [cell viewWithTag:1];
        UILabel *mylabel = [cell viewWithTag:1];


        dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0ul);
        dispatch_async(queue, ^{
            NSData *data=[NSData dataWithContentsOfURL:[NSURL URLWithString:[myarray objectAtIndex:indexPath.row ]]];
            dispatch_sync(dispatch_get_main_queue(), ^{
                imageView.image = [UIImage imageWithData:data];
            });
        });


        mylabel1.text = asong.title;
        mylabel2.text = asong.artist;
        mylabel.text = asong.duration;


        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

        return cell;
    }
    static NSString *CellIdentifier = @"cellloadmore";

    cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];

        cell.textLabel.text = @"load more";

        spinner = [[UIActivityIndicatorView alloc]
                   initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];

        cell.accessoryView = spinner;

        [spinner startAnimating];
        [spinner performSelector:@selector(stopAnimating) withObject:nil afterDelay:1];        [spinner release];
    }
    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    return cell;
}

score 0 · Accepted Answer

問題は、セルが nil の場合にのみセルを構成していることです。あなたの例では、セル 3 のコンテンツが nil でなくても、いくつかの曲に置き換えたいと思うでしょう。

deque が nil を返した場合、新しいセルを作成してサブビューを追加しますが、常にパスに基づいてコンテンツを更新します。

iphone - セルのテキストをクリックしたときにセルからテキストを削除する方法

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