我正在构建类似 TechCrunch 的文章阅读应用。我正在从服务器获取 JSON 内容数据，并在 UITableView 中显示 JSON 内容，例如文章图片、标题和作者姓名。
当用户点击一篇文章时，它会在 UIWebView 中打开。
我已经通过已在 UITableView 中获取的 segue 传递了文章的标题、作者姓名和内容。
我在我的项目中集成了第三方库 AFNetworking。我想实现文章的离线缓存意味着如果没有互联网用户可以阅读文章。
这是我的代码:
表格 View .m
- (void)viewDidLoad
{
[super viewDidLoad];
tempJson = [[NSMutableArray alloc] init];
[self.tableView reloadData];
NSString *jsonLink=[NSString stringWithFormat:@“www.example.com&page=1"];
NSURL *url = [[NSURL alloc] initWithString:jsonLink];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
operation.responseSerializer = [AFJSONResponseSerializer serializer];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
NSArray *jsonArray = (NSArray *)responseObject;
for (NSDictionary *dic in jsonArray) {
Json *json = [[Json alloc] initWithDictionary:dic];
[tempJson addObject:json];
}
self.jsons = [[NSArray alloc] initWithArray:tempJson];
[self.tableView reloadData];
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error"
message:[error localizedDescription]
delegate:nil
cancelButtonTitle:@"Ok"
otherButtonTitles:nil];
[alertView show];
}];
[operation start];
[self.tableView addInfiniteScrollingWithActionHandler:^{
}];
}
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:@"ShowDetails1"]) {
Webview *ysdetailviewcontroller = [segue destinationViewController];
NSIndexPath *myindexpath1 = [self.tableView indexPathForSelectedRow];
long row1 = [myindexpath1 row];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
ysdetailviewcontroller.DetailModal1 = @[[self.jsons[row1] title], [self.jsons[row1] author],[self.jsons[row1] a_image],[self.jsons[row1] content], [self.jsons[row1] link],[self.jsons[row1] date]];
});
}
}
网页 View .m
- (void)viewDidLoad
{
[super viewDidLoad];
NSString *Title=[NSString stringWithFormat:@"<div style=\"line-height:80px;font-size:70px;font-family: Helvetica, Arial, Sans-Serif;font-weight:600;padding-left:40px; !important;padding-right:40px; !important;\">%@</div>", _DetailModal1[0]];
NSString *AuthorName=[NSString stringWithFormat:@"<div><div style=\"color:#9E9E9E;line-height:70px;font-size:35px;font-family: Helvetica, Arial, Sans-Serif;font-weight:800;float:left;float:left;text-align:left;padding-left:40px; !important;\">%@  </div>",_DetailModal1[1]];
NSString *Date=[NSString stringWithFormat:@"<div style=\"line-height:70px;font-size:35px;font-family: Helvetica, Arial, Sans-Serif;font-weight:200;\">%@</div></div><br><br>",_DetailModal1[5]];
NSString *url=[[NSString alloc] initWithString:_DetailModal1[3] ];//_DetailModal1[3] contains article content
NSString *javaScriptStar=@"<!DOCTYPE html><html><head><body></head><div style = \"line-height:70px !important;font-size:52px !important;font-family: Helvetica, Arial, Sans-Serif;font-weight:400;padding-left:40px; !important;padding-right:40px; !important;\">";
NSString *javaScriptEnd=@"</font></div></body></html>";
NSString *javaScriptLink=@"<body link=\"#3366CC\”>";
NSString *javaScriptDec=@"<style type=\"text/css\">a {text-decoration: none; font-weight:bold; }img { display: block;margin-left: auto; margin-right: auto;margin-top: 8px;margin-bottom: 8px; width : 800px !important;height:auto;}</style>";
NSString* myURLString = [NSString stringWithFormat:@"%@%@%@%@%@%@%@%@",Title,AuthorName,Date, javaScriptDec, javaScriptLink,javaScriptStar,url,javaScriptEnd];
NSString *htmlString = [myURLString stringByReplacingOccurrencesOfString:@"src=\"//" withString:@"src=\"https://"];
_webView.delegate = self;
[_webView loadHTMLString:htmlString baseURL:nil];
}
最佳答案
您可能想看看 NSURLCache .由于 AFNetworking 是建立在 NSURLConnection 之上的，因此在应用程序委托(delegate)中设置缓存应该完全符合您的要求。
关于ios - 如何实现 JSON 的离线缓存？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26062712/