在 iCarousel 中添加独立的进度视图以指示下载
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【中文标题】在 iCarousel 中添加独立的进度视图以指示下载【英文标题】：Adding independent Progress VIew for indicate download in iCarousel 【发布时间】：2013-10-22 16:38:19 【问题描述】：下午好。我在我的应用程序 iCarousel 中使用。目前我无法进行进度查看每个项目轮播。问题是当我单击“下载按钮”时，进度视图首先添加了一个项目。他看起来很好并且工作，但也从另一个角度出现在另一个 2 项目中，它不应该出现在。之后，当我再次单击“下载按钮”时，进度视图开始相互混淆。请准确地告诉我我做错了什么以及我的性交方式？我是 Objective-c 的新手。
P.S 要下载我使用 AFNetworking 的数据。
iCarousel：
- (UIView *)carousel:(iCarousel *)carousel viewForItemAtIndex:(NSUInteger)index reusingView:(UIView *)view
NSString *docDir = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];
NSDictionary *myDic =[magazinesInfo objectAtIndex:index];
//Change image size
UIImage *img = [UIImage imageWithImage:[UIImage imageWithContentsOfFile:[NSString stringWithFormat:@"%@/%@_img.png",docDir,[myDic objectForKey:@"title"]]] scaledToSize:CGSizeMake(370,513)];
UIImageView *faceImage = [[UIImageView alloc] initWithFrame:CGRectMake(0,0,768,1004)];
UIImage *dwImage = [UIImage imageNamed:@"button.png"];
UIImage *readImage = [UIImage imageNamed:@"read_button.png"];
UIImage *deleteImage = [UIImage imageNamed:@"delete_button.png"];
UIImage *cancelImage = [UIImage imageNamed:@"cancelButton.png"];
if(view ==nil)
UILabel *nomer = [[UILabel alloc] initWithFrame:CGRectMake(345, 85+MY_OFFSET, 75, 29)];
UILabel *nameMag = [[UILabel alloc] initWithFrame:CGRectMake(55, 720+MY_OFFSET, 658, 80)];
UILabel *dateMag = [[UILabel alloc] initWithFrame:CGRectMake(55, 821+MY_OFFSET, 658, 23)];
UIButton *downloadButton = [[UIButton alloc] initWithFrame:CGRectMake(321, 890+MY_OFFSET, 128, 37)];
UIButton *readButton = [[UIButton alloc] initWithFrame:CGRectMake(246, 890+MY_OFFSET, 128, 37)];
UIButton *deleteButton = [[UIButton alloc] initWithFrame:CGRectMake(385, 890+MY_OFFSET, 128, 37)];
UIButton *cancelButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0+MY_OFFSET, 128, 37)];
view = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 768, 1004)];
view = faceImage;
faceImage.image = nil;
((UIImageView *)view).image = nil;
view.contentMode = UIViewContentModeCenter;
//Magazine number
nomer.backgroundColor = [UIColor clearColor];
nomer.textAlignment = NSTextAlignmentCenter;
[nomer setFont:[UIFont fontWithName:@"OpenSans-Light" size:36.0f]];
nomer.textColor = [UIColor whiteColor];
nomer.tag = 1;
//Magazine name
nameMag.backgroundColor = [UIColor clearColor];
nameMag.textAlignment = NSTextAlignmentCenter;
[nameMag setFont:[UIFont fontWithName:@"OpenSans-Light" size:30.0f]];
nameMag.numberOfLines=2 ;
nameMag.textColor = [UIColor blackColor];
nameMag.tag = 3;
//Date magazine
dateMag.backgroundColor = [UIColor clearColor];
dateMag.textAlignment = NSTextAlignmentCenter;
[dateMag setFont:[UIFont fontWithName:@"OpenSans-Light" size:20.0f]];
dateMag.textColor = [UIColor blackColor];
dateMag.tag = 4;
//Download button
[downloadButton setBackgroundImage:dwImage forState:UIControlStateNormal];
[downloadButton addTarget:self action:@selector(pressDownload:) forControlEvents:UIControlEventTouchUpInside];
downloadButton.tag = 5;
downloadButton.hidden = YES;
//Read button
[readButton setBackgroundImage:readImage forState:UIControlStateNormal];
[readButton addTarget:self action:@selector(readMag:) forControlEvents:UIControlEventTouchUpInside];
readButton.hidden=YES;
readButton.tag = 8;
//Delete button
[deleteButton setBackgroundImage:deleteImage forState:UIControlStateNormal];
[deleteButton addTarget:self action:@selector(deleteMag:) forControlEvents:UIControlEventTouchUpInside];
deleteButton.hidden=YES;
deleteButton.tag = 9;
[cancelButton setBackgroundImage:cancelImage forState:UIControlStateNormal];
[cancelButton addTarget:self action:@selector(deleteMag:) forControlEvents:UIControlEventTouchUpInside];
cancelButton.hidden=NO;
cancelButton.tag = 10;
//Add label to view
[view addSubview:nomer];
[view addSubview:nameMag];
[view addSubview:dateMag];
//Add button to view
[view addSubview:downloadButton];
[view addSubview:readButton];
[view addSubview:deleteButton];
[view addSubview:cancelButton];
else
//Set tag to image
((UIImageView *)faceImage).image = (UIImage*)[view viewWithTag:2];
//Set tag to label
[[[view subviews]objectAtIndex:0]viewWithTag:1];
[[[view subviews]objectAtIndex:1]viewWithTag:3];
[[[view subviews]objectAtIndex:2]viewWithTag:4];
//Set tag to button
[[[view subviews]objectAtIndex:3]viewWithTag:5];
[[[view subviews]objectAtIndex:4]viewWithTag:8];
[[[view subviews]objectAtIndex:5]viewWithTag:9];
[[[view subviews]objectAtIndex:6]viewWithTag:10];
//Hide button download and show read,delete button
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:[NSString stringWithFormat:@"%@/%@_mag.pdf",docDir,[myDic objectForKey:@"title"]]] == YES)
[[[view subviews] objectAtIndex:4] setHidden:NO];
[[[view subviews] objectAtIndex:5] setHidden:NO];
[[[view subviews] objectAtIndex:3] setHidden:YES];
else
[[[view subviews] objectAtIndex:4] setHidden:YES];
[[[view subviews] objectAtIndex:5] setHidden:YES];
[[[view subviews] objectAtIndex:3] setHidden:NO];
//Hide date and name of magazine when view changed
if (index != [self.carousel currentItemIndex])
[[[view subviews]objectAtIndex:1]setHidden:YES];
[[[view subviews]objectAtIndex:2]setHidden:YES];
else
[[[view subviews]objectAtIndex:1]setHidden:NO];
[[[view subviews]objectAtIndex:2]setHidden:NO];
((UIImageView *)view).image = img;
UILabel *nomer = [[view subviews]objectAtIndex:0];
nomer.text = [myDic objectForKey:@"title"];
UILabel *nameMag = [[view subviews]objectAtIndex:1];
nameMag.text = @"Жить интересно!” №5 Путешествия как стиль жизни";
UILabel *dateMag = [[view subviews]objectAtIndex:2];
dateMag.text = [myDic objectForKey:@"date"];
return view;
下载按钮动作：
- (IBAction)pressDownload:(id)sender
NSLog(@"download button was pressed");
NSFileManager *fileManager = [NSFileManager defaultManager];
NSDictionary *myDic = [magazinesInfo objectAtIndex:curID];
NSString *docDir = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];
NSString *pdfFilePath = [NSString stringWithFormat:@"%@/%@_mag.pdf.tmp",docDir,[myDic objectForKey:@"title"]];
NSString *newPdfNamePath = [NSString stringWithFormat:@"%@/%@_mag.pdf",docDir,[myDic objectForKey:@"title"]];
//Test for Progress bar
UIButton *pressedButton = (UIButton *)sender;
UIView *superViewOfPressedButton = pressedButton.superview;
UIProgressView *downloadProgress = [[UIProgressView alloc] initWithFrame:CGRectMake(300, 950, 127, 8)];
UILabel *downloadPrecent = [[UILabel alloc]initWithFrame:CGRectMake(430, 950, 60, 20)];
[superViewOfPressedButton addSubview:downloadProgress];
[superViewOfPressedButton addSubview:downloadPrecent];
[downloadProgress setHidden:NO];
[downloadPrecent setHidden:NO];
NSLog(@"%@",sender);
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:[myDic objectForKey:@"magazine"]]];
AFURLConnectionOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
operation.outputStream = [NSOutputStream outputStreamToFileAtPath:pdfFilePath append:NO];
[operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead)
downloadProgress.progress = (float)totalBytesRead / totalBytesExpectedToRead;
downloadPrecent.text =[NSString stringWithFormat:@"%1.0f%@ ",((float)totalBytesRead / totalBytesExpectedToRead)*100,@"%"];
];
[operation setCompletionBlock:^
[fileManager moveItemAtPath:pdfFilePath toPath:newPdfNamePath error:NULL];
[fileManager removeItemAtPath:[NSString stringWithFormat:@"%@/%@_mag.pdf.tmp",docDir,[myDic objectForKey:@"title"]] error:NULL];
[downloadProgress setHidden:YES];
[downloadPrecent setHidden:YES];
NSLog(@"downloadComplete!");
[carousel reloadData];
];
[operation start];
怀念： 抱歉，我无法理解您的问题。我在下载数据的方法中从字典中传递 URL。在 Method iCarousel 我分配 Progress View tag = 7 然后我添加一个条件来隐藏，如下所示：
if (([fileManager fileExistsAtPath:[NSString stringWithFormat:@"%@/%@_mag.pdf.tmp",docDir,[myDic objectForKey:@"title"]]] == YES) && (index == [self.carousel currentItemIndex]))
[[[view viewWithTag:7] setHidden:NO];
[[[view viewWithTag:7] setHidden:NO];
else
[[[view viewWithTag:7] setHidden:YES];
[[[view viewWithTag:7] setHidden:YES];
【问题讨论】：
【参考方案1】：不要在pressDownload: 中创建和添加进度视图。相反，在创建视图时创建它，但将其设置为hidden。然后，当您需要它时，只需取消隐藏它。当您重用视图时，请务必根据您是否在该索引处下载项目来设置适当的值。
【讨论】：
我已经尝试过这样做。我在 viewForItemAtIndex 中创建了一个进度视图，以及按钮和一个标签，为它们提供了标签。但是不好也不会结果，错误是一样的。如果点击第一个下载视图，上面会出现Progress View，甚至第三个，为什么我不明白。如果你能写出我必须显示或隐藏的条件，我不想要进度视图。 您需要在重用视图时隐藏进度视图，这是不合适的——除非您这样做，否则您会看到同样的问题。这是一个视图重用问题... 您的数据模型应该告诉您您正在下载指定索引的项目，是吗？&& (index == [self.carousel currentItemIndex]) 的目的是什么？可能想删除那个...以上是关于在 iCarousel 中添加独立的进度视图以指示下载的主要内容，如果未能解决你的问题，请参考以下文章
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