【发布时间】：2015-02-19 11:04:02
【问题描述】：
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保存单元格上的进度状态，但我的尝试不成功。
我现在在做什么：我选择一些UICollectionViewCell's，然后按“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视图，但它们不能！我知道我必须将选定单元格的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子视图。我这样做了，但它只适用于单元格选择！我应该怎么做才能在每个单元格上保存进度视图状态，这个进度真的在那里？
这是我的代码：
在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;
}
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:
- (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];
}
}
这就是我展示我的进步的方式：
-(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中分配和初始化它：
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;
这就是我所说的进度变化显示：
-(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。您可以在上面看到我如何下载和调用进度方法。
【问题讨论】：
-
你能粘贴整个 AVMVideoCell.m 代码吗？
-
@Kujey 当然，看看我的编辑
标签： ios objective-c uicollectionview uicollectionviewcell uiprogressview