IOS7笔记-11、表格视图和iPad

1、表格视图设置

　　1）storyboard中需要新建TableViewController

　　2）实现DataSource委托相关

 1 #pragma mark - Table view data source
 2 
 3 
 4 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 5 {
 6     // Return the number of rows in the section.
 7     return [self.photos count];
 8 }
 9 
10 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
11 {
12     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Flickr Photo Cell" forIndexPath:indexPath];
13     
14     NSDictionary *photo = self.photos[indexPath.row];
15     cell.textLabel.text = [photo valueForKeyPath:FLICKR_PHOTO_TITLE];
16     cell.detailTextLabel.text = [photo valueForKeyPath:FLICKR_PHOTO_DESCRIPTION];
17     
18     return cell;
19 }

　　3）选中master记录更新detail

 1 #pragma mark - UITableViewDelegate
 2 
 3 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
 4 {
 5     id detail = self.splitViewController.viewControllers[1];
 6     if ([detail isKindOfClass:[UINavigationController class]]) {
 7         detail = [((UINavigationController *)detail).viewControllers firstObject];
 8         if ([detail isKindOfClass:[ImageViewController class]]) {
 9             [self prepareImageViewController:detail toDisplayPhoto:self.photos[indexPath.row]];
10         }
11     }    
12 }

　　4）Segue

 1 #pragma mark - Navigation
 2 
 3 -(void)prepareImageViewController:(ImageViewController *)ivc toDisplayPhoto:(NSDictionary *)photo
 4 {
 5     ivc.imageURL = [FlickrFetcher URLforPhoto:photo format:FlickrPhotoFormatLarge];
 6     ivc.title = [photo valueForKeyPath:FLICKR_PHOTO_TITLE];
 7 }
 8 
 9 // In a storyboard-based application, you will often want to do a little preparation before navigation
10 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
11 {
12     // Get the new view controller using [segue destinationViewController].
13     // Pass the selected object to the new view controller.
14     if ([sender isKindOfClass:[UITableViewCell class]]) {
15         NSIndexPath *indexPath = [self.tableView indexPathForCell:sender];
16         if (indexPath) {
17             if ([segue.identifier isEqualToString:@"Display Photo"]) {
18                 if ([segue.destinationViewController isKindOfClass:[ImageViewController class]]) {
19                     [self prepareImageViewController:segue.destinationViewController toDisplayPhoto:self.photos[indexPath.row]];
20                 }
21             }
22         }
23     }
24 }

　　5）更新图片时ScrollView中需要同步刷新至初始状态，若上一幅进行了缩放或移位，需要恢复

- (void)setImage:(UIImage *)image
{
    self.scrollView.zoomScale = 1.0;
    self.imageView.image = image; // does not change the frame of the UIImageView
    //[self.imageView sizeToFit];   // update the frame of the UIImageView
    self.imageView.frame = CGRectMake(0, 0, self.image.size.width, self.image.size.height);
    // self.scrollView could be nil on the next line if outlet-setting has not happened yet
    self.scrollView.contentSize = self.image ? self.image.size : CGSizeZero;

    [self.spinner stopAnimating];
}

2、多线程另一种方式

 1 -(IBAction )fetchPhotos
 2 {
 3     [self.refreshControl beginRefreshing];
 4     NSURL *url = [FlickrFetcher URLforRecentGeoreferencedPhotos];
 5     dispatch_queue_t fetchQ = dispatch_queue_create("flickr fetcher", NULL);
 6     dispatch_async(fetchQ, ^{
 7         NSData *results = [NSData dataWithContentsOfURL:url];
 8         NSDictionary *propertyListResults = [NSJSONSerialization JSONObjectWithData:results options:NSJSONReadingMutableContainers error:NULL];
 9         
10         NSLog(@"Flickr Results = %@",propertyListResults);
11         
12         NSArray *photos =[propertyListResults valueForKeyPath:FLICKR_RESULTS_PHOTOS];
13         dispatch_async(dispatch_get_main_queue(), ^{
14             [self.refreshControl endRefreshing];
15             self.photos = photos;
16         });
17     });
18     
19 }

 

posted @ 2016-06-12 14:32  Faint@LastStep  阅读(161)  评论(0)  编辑  收藏  举报