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기사를 읽는 앱을 만들고 있어요. JSON 형식의 서버에서 데이터를 가져 와서 UITableView에로드하고 UIWebView에로드합니다.
기사에는 이미지, 비디오 및 텍스트가 포함되어 있습니다. 오프라인 캐싱은 이전에로드 된 기사를 읽을 수있는 인터넷 사용자가없는 경우를 의미합니다. 이미지에 비동기 스레드가 사용되었습니다. 당신은 하나 개의 SQLite는 파일을 데이터베이스로 JSON에서 얻는 모든 세부 사항을 저장해야iOS에서 오프라인으로 문서 캐싱 기사를 구현하려면 어떻게해야하나요?
- (void)viewDidLoad
{
[super viewDidLoad];
[self checkInternetConnection];
UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(20,10,0,20)];
titleLabel.textColor = [UIColor blackColor];
titleLabel.backgroundColor = [UIColor clearColor];
titleLabel.text = @"Story";
[self.navigationItem setTitleView:titleLabel];
UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
spinner.center = CGPointMake(160, 240);
spinner.hidesWhenStopped = YES;
[self.view addSubview:spinner];
[spinner startAnimating];
BOOL myBool = [self isNetworkAvailable];
if (myBool)
{
@try {
self.tableView.separatorColor = [UIColor colorWithRed:190/255.0 green:190/255.0 blue:190/255.0 alpha:1.0];
// for displaying the previous screen lable with back button in details view controller UIBarButtonItem *backbutton1 = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStyleBordered target:nil action:nil];
[[self navigationItem] setBackBarButtonItem:backbutton1];
_Title1 = [[NSMutableArray alloc] init];
_Author1 = [[NSMutableArray alloc] init];
_Images1 = [[NSMutableArray alloc] init];
_Details1 = [[NSMutableArray alloc] init];
_link1 = [[NSMutableArray alloc] init];
_Date1 = [[NSMutableArray alloc] init];
pageNumber=1;
NSData* data = [NSData dataWithContentsOfURL:ysURL];
NSArray *ys_avatars = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
if(ys_avatars){
for (int j=0;j<ys_avatars.count;j++)
{
[_Title1 addObject:ys_avatars[j][@"title"]];
[_Author1 addObject: ys_avatars[j][@"author"]];
[_Images1 addObject: ys_avatars[j][@"featured_img"]];
[_Details1 addObject:ys_avatars[j][@"content"]];
[_link1 addObject:ys_avatars[j][@"permalink"]];
NSString *newStr=[ys_avatars[j][@"date"] substringToIndex:[ys_avatars[j] [@"date"] length]-3];
[_Date1 addObject:newStr];
}
}
else
{
NSLog(@"asd");
}
}
@catch (NSException *exception) {
}
dispatch_queue_t downloadQueue = dispatch_queue_create("downloader", NULL);
dispatch_async(downloadQueue, ^{
// do our long running process here
[NSThread sleepForTimeInterval:3];
// do any UI stuff on the main UI thread
dispatch_async(dispatch_get_main_queue(), ^{
[spinner stopAnimating];
});
});
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *Cellidentifier1 = @"ysTableViewCell";
ysTableViewCell *cell1 = [tableView dequeueReusableCellWithIdentifier:Cellidentifier1 forIndexPath:indexPath];
long row = [indexPath row];
cell1.TitleLabel1.text = _Title1[row];
cell1.AuthorLabel1.text = _Author1[row];
NSString *yourStoryUrl = [_Images1[indexPath.row] stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];
if(yourStoryUrl) {
NSArray *subStringsUrl = [yourStoryUrl componentsSeparatedByString:@"/"];
NSString *stripedName = [subStringsUrl lastObject];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString* filePath =[documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@",stripedName]];
NSLog(@"File Path retrieved %@", filePath);
if(filePath) {
UIImage *image = [UIImage imageWithContentsOfFile:filePath];
if(image) {
ysTableViewCell *updateCell =(id)[tableView cellForRowAtIndexPath:indexPath];
if(updateCell)
updateCell.ThumbImage1.image=image;
cell1.ThumbImage1.image=image;
} else {
dispatch_queue_t taskQ = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(taskQ, ^{
NSURL *Imageurl = [NSURL URLWithString:yourStoryUrl];
NSData *data = [NSData dataWithContentsOfURL:Imageurl];
UIImage *images1 = [[UIImage alloc] initWithData:data];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSData *imageData = UIImagePNGRepresentation(images1);
//_imagePath =[documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png",stripedName]];
if (![imageData writeToFile:filePath atomically:NO])
{
NSLog((@"Failed to cache image data to disk"));
}
else
{
NSLog((@"the cachedImagedPath is %@",filePath));
}
dispatch_sync(dispatch_get_main_queue(), ^{
ysTableViewCell *updateCell =(id)[tableView cellForRowAtIndexPath:indexPath];
if(updateCell)
updateCell.ThumbImage1.image=images1;
cell1.ThumbImage1.image=images1;
});
});
return cell1;
}