保存UICollectionViewCell进度状态

时间：2015-02-19 11:04:03

标签： ios objective-c uicollectionview uicollectionviewcell uiprogressview

我已经问过关于保存按下按钮状态的相同问题，我认为我应该以相同的方式保存单元格上的进度状态，但我的尝试不成功。

我现在正在做的事情：我选择一些UICollectionViewCell's，然后按＆＃34;下载＆＃34;按钮，然后downolad动作开始。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，另一个细胞也有进展视图，但它们不能！我知道我必须在indexPath中保存NSMutableArray个所选单元格，然后在cellForItemAtIndexPath中检查当前单元格indexPath是否在我的数组中，然后显示或隐藏我单元格的子视图。我这样做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视图状态这个进展真的存在？

这是我的代码：

cellForItemAtIndexPath： 

 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;


}

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];
        }
    }
}

didDeselectItemAtIndexPath： 

- (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：关于进度的说明  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;

这是我调用进度更改的地方：

-(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


  }];

}

当我在集合视图中选择一个项目时，我收集他们的模型对象，获取每个id并创建url数组，然后在for..in循环中逐个传递url然后启动异步下载。您可以看到我如何下载并调用上面的进度方法。

2 个答案:

答案 0 :(得分：1)

您可以为单元格模型创建类，将这些模型存储在viewController中的数组中，并使用它们从/为单元格获取/设置所有状态。
像这样：

@interface CellModel : NSObject
    @property(nonatomic) BOOL selected;
    @property(nonatomic) NSUInteger progress;
@end

在viewController中：

@interface MyViewController () <UITableViewDataSource, UITableViewDelegate>
    @property (nonatomic) NSArray* models;
@end

答案 1 :(得分：1)

我需要知道您是否有重用问题或模型问题。

首先尝试一下：

- (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];
    }
}

并删除didDeselect委托。

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;
}

同时删除你在cellForItemAtIndexPath方法中使用progressView所做的事情。

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