reloadRowsAtIndexPaths自定义UITableViewCell外观不会更改后
我有一个自定义的UITableViewCell创build一个.xib并将其添加到一个TableView。 该单元格包含一个button来下载一些数据。 在button上单击下载开始，button消失显示一个取消button和一个自定义视图与下载进度。 下载完成后，我更新我的模型，并重新加载应用程序的可见区域中的行。
当我debugging时，我看到cellForRowAtIndexPath方法被调用，模型得到更新。 这意味着取消 – button和进度 – 查看得到设置隐藏= YES; 但是它们不会消失。 在将单元格从视图中移出并返回之后，进度视图将被隐藏，但不会取消button。
TableView方法：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ static NSString *cellIdentifierHeaderCell = @"PodcastListHeaderCell"; static NSString *cellIdentifierBodyCell = @"PodcastListBodyCell"; // Convert string to date object NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init]; [dateFormat setDateFormat:@"EEE, d MMM yyyy HH:mm:ss Z"]; if(indexPath.row == 0) { MGPodcastListHeaderCell *cell = (MGPodcastListHeaderCell *)[tableView dequeueReusableCellWithIdentifier:cellIdentifierHeaderCell]; if (cell == nil) { ... } return cell; } else { MGPodcastListBodyCell *cell = (MGPodcastListBodyCell *)[tableView dequeueReusableCellWithIdentifier:cellIdentifierBodyCell]; if (cell == nil) { UIViewController *controller = [[UIViewController alloc] initWithNibName:@"MGPodcastListBodyCell" bundle:nil]; cell = (MGPodcastListBodyCell *)controller.view; NSMutableDictionary *mediaIntem = self.mediaData[(NSUInteger) (indexPath.row-1)]; cell.mediaTitleLabel.text = mediaIntem[@"title"]; NSDate *date = [dateFormat dateFromString:mediaIntem[@"pubDate"]]; cell.pubDateLabel.text = [date descriptionWithLocale:[NSLocale currentLocale]]; cell.durationLabel.text = mediaIntem [@"duration"]; cell.accessoryType = UITableViewCellAccessoryDetailButton; cell.podcastId = (NSInteger) (indexPath.row-1); cell.cellPlayState = [[MGPlayState alloc] initWithPlayState:(NSInteger) [mediaIntem[@"playState"] integerValue]]; [cell setPodcastCellDelegate:self]; } return cell; } } -(void) downloadButtonPressedOfCell:(NSInteger)podcastId { APConnection *con = [[APConnection alloc] init]; BOOL reachable = [con reachableHost]; if (reachable) { //============Get Media Item ============================= NSMutableDictionary *mediaDict = self.mediaData[(NSUInteger)podcastId]; MGPlayState *pl_state = [[MGPlayState alloc] initWithPlayState:[[mediaDict objectForKey:@"playState"] integerValue]]; NSString *urlString = [mediaDict objectForKey:@"mediaLink"]; /// Finde Pathname NSString *fileName = [urlString lastPathComponent]; NSLog(@"LastFileComponent: %@", fileName); NSString *pathName = [NSString stringWithFormat:@"%@/%@", [APFilePath getMediaContentFolder], fileName]; /// Request und Operation NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]]; AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request]; operation.outputStream = [NSOutputStream outputStreamToFileAtPath:pathName append:NO]; //// save Operation for cancle NSMutableDictionary *operationDict = [[NSMutableDictionary alloc] init]; [operationDict setObject:operation forKey:@"operation"]; [operationDict setObject:[NSNumber numberWithInt:podcastId] forKey:@"myIndexPath"]; [operationDict setObject:[mediaDict objectForKey:@"mediaLink"] forKey:@"mediaLink"]; [[self operationDictArr] addObject:operationDict]; [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { NSIndexPath *path = [NSIndexPath indexPathForRow:podcastId+1 inSection:0]; MGPodcastListBodyCell *myCell = (MGPodcastListBodyCell *) [self.podcastListTable cellForRowAtIndexPath:path]; [pl_state setToPlayState:PlayStateDefaultDownloadFinished]; myCell.cellPlayState = pl_state; //============ Get mediaItem ============================= self.mediaData[(NSUInteger)podcastId][@"playState"] = @4; /// remove operation from dict [[self operationDictArr] removeObject:operationDict]; [self.podcastListTable reloadRowsAtIndexPaths:[self.podcastListTable indexPathsForVisibleRows] withRowAnimation:UITableViewRowAnimationNone]; [self.podcastListTable setNeedsDisplay]; } failure:^(AFHTTPRequestOperation *operation, NSError *error) { NSLog (@"Error downloadMovie: %@", error); }]; [operation start]; } else { [EZToastView showToastMessage:NSLocalizedString(@"keineVerbindungKey", "") withAlignment:EZToastViewAlignmentCenter]; } } 自定义单元格
//// MGPodcastListBodyCell.h @protocol MGPodcastCellDelegate <NSObject> @required -(void) downloadButtonPressedOfCell: (NSInteger) podcastId; -(void) cancleDownloadButtonPressedOfCell: (NSInteger) podcastId; @end @interface MGPodcastListBodyCell : UITableViewCell @property (nonatomic, retain) id <MGPodcastCellDelegate> podcastCellDelegate; @property (weak, nonatomic) IBOutlet UILabel *mediaTitleLabel; @property (weak, nonatomic) IBOutlet UILabel *durationLabel; @property (weak, nonatomic) IBOutlet UIButton *downloadMediaButton; @property (weak, nonatomic) IBOutlet UIButton *cancelMediaDownloadButton; @property (weak, nonatomic) IBOutlet MGProgressDownloadView *progressDownloadView; @property (weak, nonatomic) IBOutlet UILabel *pubDateLabel; @property (strong, nonatomic) MGPlayState *cellPlayState; @property (nonatomic) NSInteger podcastId; - (IBAction) downloadButtonPressed:(UIButton *)sender; - (IBAction) cancleMediaDownloadButonPressed:(UIButton *)sender; @end //MGPodcastListBodyCell.m @implementation MGPodcastListBodyCell @synthesize cellPlayState = _cellPlayState; - (void)setCellPlayState:(MGPlayState *) cellPlayState { _cellPlayState = cellPlayState; [self playStateChanged]; } - (void)awakeFromNib { [self setup]; } - (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier { self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]; if (self) { [self setup]; } return self; } - (void)setup { UIView *customBackgroundView = [[UIView alloc] init]; customBackgroundView.backgroundColor = [APAppearence sharedInstance].tableCellBackgroundColorMB; self.backgroundView = customBackgroundView; self.mediaTitleLabel.textColor = [APAppearence sharedInstance].tableCellMainlabelTextColorMB; self.durationLabel.textColor = [APAppearence sharedInstance].standardDarkGrayColorMB; self.tintColor = [APAppearence sharedInstance].tableCellMainlabelTextColorMB; [self playStateChanged]; } - (void)setSelected:(BOOL)selected animated:(BOOL)animated { [super setSelected:selected animated:animated]; // Configure the view for the selected state } - (void) playStateChanged { self.downloadMediaButton.hidden = self.cellPlayState.playButtonHidden; [self.downloadMediaButton setNeedsDisplay]; self.cancelMediaDownloadButton.hidden = self.cellPlayState.cancelButtonHidden; [self.cancelMediaDownloadButton setNeedsDisplay]; self.progressDownloadView.hidden = self.cellPlayState.progressViewHidden; [self setNeedsDisplay]; } - (IBAction) downloadButtonPressed:(UIButton *)sender { [self.podcastCellDelegate downloadButtonPressedOfCell: self.podcastId]; } - (IBAction) cancleMediaDownloadButonPressed:(UIButton *)sender { [self.podcastCellDelegate cancleDownloadButtonPressedOfCell: self.podcastId]; } @end
所以如果有人可以告诉我，要重新装载单元格来更新视图，我将非常感激。 谢谢。
当你重新加载单元格，你有代码如下…
MGPodcastListBodyCell *cell = (MGPodcastListBodyCell *)[tableView dequeueReusableCellWithIdentifier:cellIdentifierBodyCell]; if (cell == nil) { .... }
在你的- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{方法。 因为这个单元格正在被重用，所以这个单元cell第二次不会被删除，因此不会被任何新的信息更新。
当cell不是无刷新的时候，你需要做一些事情。
我发现了错误。 这不是reloadRowAtIndexPath方法的问题。 这是一个并发问题。 下载完成状态仅在下载结束时被下载进度线程覆盖，状态被设置为下载。
所以，谢谢大家的帮助。