我正在尝试解析包含图像链接的 json 文件。这是我的代码：
#import "Pictures.h"
#import "DEMONavigationController.h"
#import "PicturesObject.h"
@interface Pictures ()
{
NSInteger refreshIndex;
NSArray *images;
NSMutableArray *jsonIs;
NSArray *items;
IBOutlet UIImageView *imagesinsta;
}
@end
@implementation Pictures
- (void)viewDidLoad
{
[super viewDidLoad];
self.title = @"Pictures";
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Menu"
style:UIBarButtonItemStylePlain
target:(DEMONavigationController *)self.navigationController
action:@selector(showMenu)];
// ***************** FETCHING DATA ******************* //
NSURL *URL = [NSURL URLWithString:[NSString stringWithFormat:@"link-to-json.php?image=Image"]];
NSData *data= [NSData dataWithContentsOfURL:URL];
if (data == nil) {
return;
}
NSError* error;
items = [NSJSONSerialization JSONObjectWithData:data
options:kNilOptions
error:&error];
NSLog(@"Json : %@",jsonIs);
if (jsonIs != nil) {
NSMutableDictionary* aDict = jsonIs[0];
NSString *item_media = [aDict objectForKey:@"link"];
}
// ***************** FETCHING DATA ******************* //
}
#pragma mark - Table view data source
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *simpleTableIdentifier = @"PicturesObject";
PicturesObject *cell = (PicturesObject *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"PicturesObject" owner:self options:nil];
cell = [nib objectAtIndex:0];
}
// The element in the array is going to be a dictionary. I JUST KNOW THIS. The key for the tweet is "text".
NSDictionary *item = [items objectAtIndex:indexPath.row];
NSString *item_media = [item objectForKey:@"link"];
return cell;
}
- (void)issueLoadRequest
{
// Dispatch this block asynchronosly. The block gets JSON data from the specified URL and performs the proper selector when done.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSData* data = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"link-to-json.php?image=Image"]];
[self performSelectorOnMainThread:@selector(receiveData:) withObject:data waitUntilDone:YES];
});
}
- (void)receiveData:(NSData *)data {
// When we have the data, we serialize it into native cocoa objects. (The outermost element from twitter is
// going to be an array. I JUST KNOW THIS. Reload the tableview once we have the data.
self.tweets = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
[self.myTableView reloadData];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return self.tweets.count;
}
@end
这是我的自定义 PicturesObject 表视图的样子：
但是当我启动我的应用程序时，我只会看到这样的屏幕：
