ios - 保存 UICollectionViewCell 进度状态

Question

我已经问过关于保存按下按钮状态的相同问题，我认为我应该以同样的方式在单元格上保存进度状态，但我的尝试没有成功。

我现在在做什么:我选择了一些 UICollectionViewCell 的，然后按下“下载”按钮，然后开始下载操作。我选择的每个单元格都显示 UIProgressView，一切正常，直到我向上或向下滚动 UICollectionView。当我这样做时，另一个单元格也有进度 View ，但它们不能!我知道我必须将所选单元格的 indexPath 保存在 NSMutableArray 中，然后在 cellForItemAtIndexPath 中检查当前单元格 indexPath 是否在我的数组中，然后显示或隐藏我的单元格的 subview 。我这样做了，但它只适用于细胞选择!我应该怎么做才能在每个单元格上保存进度 View 状态，这个进度真的在那里吗？

这是我的代码:

在cellForItemAtIndexPath中:

 NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:(unsigned int)indexPath.row];
if ([selecedCellsArray containsObject:[NSString stringWithFormat:@"%@",rowNsNum]]  )
{

    cell.selectedBG.hidden = NO;
    cell.selectedImg.hidden = NO;


}
else
{

    cell.selectedBG.hidden = YES;
    cell.selectedImg.hidden = YES;
    cell.progressView.hidden = YES;


}

在didSelectItemAtIndexPath:

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
...
        // Add the selected item into the array
        [selectedIds addObject:selectedId];
        [selectedVideos addObject:selectedVideo];
        AVMVideoCell *collectionCell = (AVMVideoCell*)[collectionView cellForItemAtIndexPath:indexPath];
        NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:(unsigned int)indexPath.row];
        if ( ![selecedCellsArray containsObject:[NSString stringWithFormat:@"%@",rowNsNum]]  )
        {
            [selecedCellsArray addObject:[NSString stringWithFormat:@"%ld",(long)indexPath.row]];
            collectionCell.selectedBG.hidden = NO;
            collectionCell.selectedImg.hidden = NO;
            [collectionCell setSelected:YES];
        }
    }
}

在didDeselectItemAtIndexPath中:

- (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath {
   ...

    // Delete the selected item from the array
    [selectedIds removeObject:selectedId];
    [selectedVideos removeObject:selectedVideo];
    AVMVideoCell *collectionCell = (AVMVideoCell*)[collectionView cellForItemAtIndexPath:indexPath];
    NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:(unsigned int)indexPath.row];
    if ( [selecedCellsArray containsObject:[NSString stringWithFormat:@"%@",rowNsNum]]  )
    {
        [selecedCellsArray removeObject:[NSString stringWithFormat:@"%ld",(long)indexPath.row]];
        collectionCell.selectedBG.hidden = YES;
        collectionCell.selectedImg.hidden = YES;
        [collectionCell setSelected:NO];

    }
}

这就是我展示进步的方式:

-(NSString *)progress:(long long )val1 : (long long )val2 : (AVMVideoCell *)cell : (NSString *)name : (NSIndexPath *)path{

float progress = ((float)val1) / val2;
NSString *prog = [[NSNumber numberWithFloat:progress*100] stringValue];
if (prog != nil){
    if(cell.isSelected){
    cell.selectedImg.hidden = YES;
    cell.progressView.hidden = NO;
    }
}


NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:(unsigned int)path.row];
if ( [selecedCellsArray containsObject:[NSString stringWithFormat:@"%@",rowNsNum]])
{
[cell.progressView setProgress:progress animated:YES];
}

if([prog intValue]==100){
    cell.progressView.hidden = YES;

}
return prog;
}

编辑:AVMVideoCell.m

#import "AVMVideoCell.h"


@implementation AVMVideoCell
{
    NSString *fullUrl;
}
@synthesize imageView;
@synthesize selectedBG;
@synthesize progressLabel;
@synthesize progressView;
@synthesize selectedImg;
@synthesize progLayer;

-(void) setVideo:(AVMDataStore *)video {
if(_video != video) {
    _video = video;
}
NSString *durString = [NSString stringWithFormat:@"%@",[self timeFormatted:_video.duration]];
if((_video.filePreview != nil) && ![_video.filePreview isEqualToString:@""]){
fullUrl = [NSString stringWithFormat:@"http://example.com%@",_video.filePreview];
}

NSURL *imgURL = [NSURL URLWithString:fullUrl];

[self.imageView setImageWithURL:imgURL
               placeholderImage:[UIImage imageNamed:@"yesterday.png"] options:0 usingActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
self.duration.text = durString;

}

- (NSString *)timeFormatted:(int)totalSeconds
{

int seconds = totalSeconds % 60;
int minutes = (totalSeconds / 60) % 60;
int hours = totalSeconds / 3600;

return [NSString stringWithFormat:@"%02d:%02d:%02d",hours, minutes, seconds];
}
@end

编辑 2:进度说明 我的 progressView 不是 IBOutlet 它是 @property (nonatomic,strong) UIProgressView *progressView; (AVMVideoCell.h)

我在 cellForItemAtIndexPath 中分配并初始化它:

cell.progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0,0, 150.0f, 1.0f)];
cell.progressView.trackTintColor = [UIColor colorWithWhite:255 alpha:0.5f];
cell.progressView.progressTintColor = [UIColor whiteColor];
[cell.progLayer addSubview:cell.progressView];
cell.progressView.hidden = YES;
cell.progressView.tag = indexPath.row+500;

这就是我称之为进度变化显示的地方:

-(void)downloadStart:(NSString*)fileUrl : (NSString*)name : (AVMVideoCell *) cell : (NSIndexPath *)path{

NSURL *URL = [NSURL URLWithString:fileUrl];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];
NSString *fileName = [NSString stringWithFormat:@"%@.mp4",name]; //set full file name to save
AFHTTPRequestOperation *downloadRequest = [[AFHTTPRequestOperation alloc] initWithRequest:request]; //create download request
[downloadRequest setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSData *data = [[NSData alloc] initWithData:responseObject];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *pathToFile = [NSString stringWithFormat:@"%@/%@", [paths firstObject],fileName]; // path to 'Documents'

    NSString *pathOfFile = [[paths objectAtIndex:0] stringByAppendingPathComponent:fileName];
    operation.outputStream = [NSOutputStream outputStreamToFileAtPath:pathOfFile append:NO];
   BOOL success =  [data writeToFile:pathToFile atomically:YES];
    if(success){
         [self checkIfExists:name : cell :path];
    }

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"file downloading error : %@", [error localizedDescription]);
    UIAlertView * alert=[[UIAlertView alloc]initWithTitle:@"Error" message:[NSString stringWithFormat:@"%@",error] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil ];
    [alert show];
    cell.progressView.hidden = YES;

}];
// Step 5: begin asynchronous download
[downloadRequest start];
[downloadRequest setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {

    [self progress:totalBytesRead :totalBytesExpectedToRead :cell :name : path]; //here I pass val1 and val 2


  }];

}

当我在 Collection View 中选择一个项目时，我收集他们模型的对象，获取每个 id 并制作 url 数组，然后在 for..in 循环中我一个接一个地传递 url，然后开始异步下载。你可以看到我如何下载和调用上面的进度方法。

Answer 1

我需要知道您是否有重用问题或模型问题。

所以首先试试这个:

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
...

    if (![selectedIds.containsObject:selectedId])
    {
        // Add the selected item into the array
        [selectedIds addObject:selectedId];
        [selectedVideos addObject:selectedVideo];
        AVMVideoCell *collectionCell = (AVMVideoCell*)[collectionView cellForItemAtIndexPath:indexPath];
        NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:(unsigned int)indexPath.row];
        if ( ![selecedCellsArray containsObject:[NSString stringWithFormat:@"%@",rowNsNum]]  )
        {
            [selecedCellsArray addObject:[NSString stringWithFormat:@"%ld",(long)indexPath.row]];
            collectionCell.selectedBG.hidden = NO;
            collectionCell.selectedImg.hidden = NO;
            [collectionCell setSelected:YES];
        }
    }
    else {
    // Delete the selected item from the array
    [selectedIds removeObject:selectedId];
    [selectedVideos removeObject:selectedVideo];
    AVMVideoCell *collectionCell = (AVMVideoCell*)[collectionView cellForItemAtIndexPath:indexPath];
    NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:(unsigned int)indexPath.row];
    if ( [selecedCellsArray containsObject:[NSString stringWithFormat:@"%@",rowNsNum]]  )
    {
        [selecedCellsArray removeObject:[NSString stringWithFormat:@"%ld",(long)indexPath.row]];
        collectionCell.selectedBG.hidden = YES;
        collectionCell.selectedImg.hidden = YES;
        [collectionCell setSelected:NO];
    }
}

并移除 didDeselect 委托(delegate)。

让我知道接下来会发生什么。

编辑:

好的，现在试试这个:

// Lazy instantiation of the progressView
- (UIProgressView *)progressView
{
    if (!_progressView)
    {
        _progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0,0, 150.0f, 1.0f)];
        _progressView.trackTintColor = [UIColor colorWithWhite:255 alpha:0.5f];
        _progressView.progressTintColor = [UIColor whiteColor];
        _progressView.hidden = YES;

        [self.contentView addSubview:_progressView];
    }

    return _progressView;
}


// Here we remove the progressView on reuse
-(void)prepareForReuse
{
    [super prepareForReuse];

    [self.progressView removeFromSuperview];
    self.progressView = nil;
}

同时删除您在 cellForItemAtIndexPath 方法中对 progressView 所做的操作。