Question

摘要我想删除自定义表格视图单元格中的重复子视图。滚动桌面视图后，我的自定义表格视图单元格中的旧视频播放器视图和按钮始终显示。我想要删除旧的视频视图，并且按钮一次又一次出现。

我做了什么

StoryImage

我在我的项目中使用了storyboard并制作了自定义的tableview单元格来填充整个屏幕尺寸。！
我设置了self.tableview.pagingEnabled = YES。
我在这段代码中使用了ReactiveCocoa，Parse.com和SCRecorder（用于播放像Vine这样的视频）。
我在我的自定义tableviewCell类（称为MainViewCell）中为自定义UITableViewCell中的每个子视图创建了IBOutlet。使用此自定义tableviewCell的tableview控制器称为MainViewController。

我的问题

确定。我承认这应该是一个非常容易的问题。但是我无法解决这个问题，尽管到目前为止我通过google和堆栈溢出搜索并应用了所有方法。我的tableview单元格一遍又一遍地创建子视图。

我的假设

首先，我创建另一个videoPlayerview的主要假设是重用单元格在重用时会反复创建另一个回放视图。

重用单元格将再次创建另一个SCVideoPlayerView（VideoPlayerView）。

所以，我试图在prepareForReuse中将videoPlayerview设为nil，就像这样

-(void)prepareForReuse
{
    [super prepareForReuse];
    self.buyButton = nil;
    self.moreButton = nil;
    self.messageButton =nil;
    self.usernameButton = nil;
    self.videoPlayerView = nil;
}

当我这样做时，会发生更奇怪的事情。存在基础视图，删除了新视图，这不是我想要的。

当我在（MainViewCell *）tableView :( UITableView *）tableView cellForRowAtIndexPath：（NSIndexPath *）indexPath中单元格不为nil时删除videoPlayerview，当我这样做时，视图本身被完全删除。我也尝试了这个（void）tableView：（UITableView *）tableView didEndDisplayingCell：（UITableViewCell *）cell1 forRowAtIndexPath：（NSIndexPath *）indexPath。但是，它表现出相同的行为。

我还尝试使用removeFromSuperLayer方法删除prepareForReuse中SCVideoPlayerView类中的（强，非原子，读写）AVPlayerLayer * playerLayer子图层。当我这样做时，它崩溃了我的应用程序。

对于按钮，我在prepareForReuse方法中将按钮设置为nil。但它也删除了新视图，而不是旧视图。以下是此问题的完整代码段。

MainViewController

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  static NSString *CellIdentifier = @"MainCell";
  MainViewCell *cell = (MainViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];


self.cell = cell;
PFObject *product = [self.products objectAtIndex:indexPath.row];
self.product = product;
self.title = [product objectForKey:@"productName"];
PFUser *uploader = [self.owners objectAtIndex:indexPath.row];
self.uploader = uploader;
[cell configureCellWithProduct:product andUploader:uploader withIndexPath:indexPath];

[[[cell.usernameButton rac_signalForControlEvents:UIControlEventTouchUpInside]doNext:^(id x) {
    cell.usernameButton.enabled = NO;
}] subscribeNext:^(id x) {
    cell.usernameButton.enabled = YES;
    [self stopVideo];
    [self performSegueWithIdentifier:@"myPine" sender:self];
}];

[[[cell.buyButton rac_signalForControlEvents:UIControlEventTouchUpInside]doNext:^(id x) {
    cell.buyButton.enabled = NO;
}] subscribeNext:^(id x) {
    cell.buyButton.enabled = YES;
    [self stopVideo];
    [self performSegueWithIdentifier:@"buyThisOne" sender:self];
}];

[[[cell.messageButton rac_signalForControlEvents:UIControlEventTouchUpInside]doNext:^(id x) {
    cell.messageButton.enabled = NO;
}] subscribeNext:^(id x) {
    cell.messageButton.enabled = YES;
    [self stopVideo];
    [self performSegueWithIdentifier:@"showMessages" sender:self];
}];

[[[cell.moreButton rac_signalForControlEvents:UIControlEventTouchUpInside] doNext:^(id x) {
    cell.moreButton.enabled = NO;
}] subscribeNext:^(id x) {
    cell.moreButton.enabled = YES;
    [self stopVideo];
    [self showActionSheet];
}];


return cell;

}

MainViewCell.h

@interface MainViewCell : UITableViewCell
{
    SCPlayer *player;
}
@property (weak, nonatomic) IBOutlet SCVideoPlayerView *videoPlayerView;
@property (weak, nonatomic) IBOutlet UIImageView *profileImage;
@property (weak, nonatomic) IBOutlet UIButton *usernameButton;
@property (weak, nonatomic) IBOutlet UILabel *priceLabel;
@property (weak, nonatomic) IBOutlet UILabel *locationLabel;
@property (weak, nonatomic) IBOutlet UILabel *yearLabel;
@property (weak, nonatomic) IBOutlet UIButton *buyButton;
@property (weak, nonatomic) IBOutlet UIButton *messageButton;
@property (weak, nonatomic) IBOutlet UIButton *moreButton;



-(void)configureCellWithProduct:(PFObject *)product andUploader:(PFUser *)uploader withIndexPath:(NSIndexPath *)indexPath;

MainViewCell.m

-(void)configureCellWithProduct:(PFObject *)product andUploader:(PFUser *)uploader withIndexPath:(NSIndexPath *)indexPath
{

NSLog(@"Configure cell is called");
CacheManagement *cacheManagement = [CacheManagement sharedStore];
self.uploader = uploader;
self.product = product;
NSNumber *price = [product objectForKey:@"productPrice"];
[self.usernameButton setTitle:[uploader objectForKey:@"name"] forState:UIControlStateNormal];
[self.usernameButton setContentHorizontalAlignment:UIControlContentHorizontalAlignmentLeft];
self.priceLabel.text = [NSString stringWithFormat:@"$%@", price.stringValue];
self.yearLabel.text = [product objectForKey:@"productYear"];
self.locationLabel.text = [uploader objectForKey:@"currentCity"];


__block PFFile *videoFile =[product objectForKey:@"videoFile"];

EGOCache *cache = [EGOCache globalCache];

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0);
dispatch_async(queue, ^{

    NSString *fileName = [NSString stringWithFormat:@"Video%ld", [CacheManagement sharedStore].productCount- indexPath.row];
    NSString *key = [fileName stringByAppendingPathExtension:@".mov"];

    if(![cache hasCacheForKey:key])
    {
        [cacheManagement videoDownload:videoFile withIndexPath:indexPath forVideoView:self.videoPlayerView];

    }
    else
    {
        [self playVideoWithKey:key];
    }

});



if([cache hasCacheForKey:self.product.objectId])
{
    NSData *imageData = [cache dataForKey:@"images"];
    self.avatars = [NSKeyedUnarchiver unarchiveObjectWithData:imageData];
    NSLog(@"self.avatars : %@", self.avatars);
    NSLog(@"We have cache for uploader!");
    UIImage *profileImage = [self.avatars objectForKey:[self.uploader objectForKey:@"name"]];
    dispatch_async(dispatch_get_main_queue(), ^{
        self.profileImage.image = profileImage;
    });
}
else
{
    ImageUtil *downloader = [ImageUtil sharedStore];
    [downloader profileImageDownloadforUser:self.uploader completion:^(UIImage *image) {
        [cacheManagement saveCacheForProfileImage:image withObjectId:self.uploader.objectId];
        dispatch_async(dispatch_get_main_queue(), ^{
            self.profileImage.image = image;
        });
    }];

}
}

-(void)awakeFromNib
{
[super awakeFromNib];
NSLog(@"Awake from nib!");
player = self.videoPlayerView.player;
player.delegate = self.videoPlayerView;
UITapGestureRecognizer *gestureRecognizer = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleTap:)];
gestureRecognizer.numberOfTapsRequired=1;
[self.videoPlayerView addGestureRecognizer:gestureRecognizer];

if([player isPlaying])
{
    [self stopVideo];
}
}


-(void)playVideoWithKey:(NSString *)key
{
EGOCache *cache = [EGOCache globalCache];
if(self.videoPlayerView.player !=nil)
{
    NSLog(@"Reinitializing video PlayerView");
    SCVideoPlayerView *playerView = [self.videoPlayerView initWithPlayer:player];
    playerView.frame = self.videoPlayerView.frame;
    self.videoPlayerView= nil;

    self.videoPlayerView = playerView;
}
[self setVideoPath:[cache cachePathForTheKey:key]];
dispatch_async(dispatch_get_main_queue(), ^{

    NSURL *url = [NSURL fileURLWithPath:self.videoPath];
    [player setItemByUrl:url];

    player.shouldLoop = YES;


    NSLog(@"Playing video");
    [player play];
});

}

-(void)prepareForReuse
{
   [super prepareForReuse];
   self.buyButton = nil;
   self.moreButton = nil;
   self.messageButton =nil;
   self.usernameButton = nil;
}

我的tableview会创建重复的子视图。我搜索了很多，但仍然无法解决这个问题

0 个答案: