Will的部落格

本範例從台北市動物園的開放資料平台拿出動物簡介的開放資料如下，

http://data.taipei.gov.tw/opendata/apply/json/RjYyMDdCMzUtRDE5Ny00MTg1LTg4ODgtOEMyNkE1NDEyMkY0

建立一個master detail application專案，

取出JSON再轉為人類可閱讀格式，

並列印在條列式清單上，程式碼如下

MasterViewController.h

#import <UIKit/UIKit.h>

@interface MasterViewController : UITableViewController<NSURLConnectionDelegate, NSURLConnectionDataDelegate>
{
    NSMutableData *responseData;
    NSMutableArray *dataArray;
}

@end

MasterViewController.m

#import "MasterViewController.h"
#import "DetailViewController.h"

@interface MasterViewController ()

@property NSMutableArray *objects;
@end

@implementation MasterViewController


- (void)awakeFromNib {
    [super awakeFromNib];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.navigationItem.leftBarButtonItem = self.editButtonItem;

    UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(insertNewObject:)];
    self.navigationItem.rightBarButtonItem = addButton;
    
    NSString *urlString = @"http://data.taipei.gov.tw/opendata/apply/json/RjYyMDdCMzUtRDE5Ny00MTg1LTg4ODgtOEMyNkE1NDEyMkY0";
    
    NSURLRequest *theRequest = [[NSURLRequest alloc]initWithURL:[NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:60.0f];
    
    NSURLConnection *theConnection = [NSURLConnection connectionWithRequest:theRequest delegate:self];
    
    if(theConnection){
        responseData = [NSMutableData data];
    }else{
        NSLog(@"error");
    }
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    responseData = nil;
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    [responseData setLength:0];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    [responseData appendData:data];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    dataArray = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingMutableContainers error:nil];
    [self.tableView reloadData];
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


- (void)insertNewObject:(id)sender {
    if (!self.objects) {
        self.objects = [[NSMutableArray alloc] init];
    }
    [self.objects insertObject:[NSDate date] atIndex:0];
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
    [self.tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
}

#pragma mark - Segues

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([[segue identifier] isEqualToString:@"showDetail"]) {
        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
        NSDate *object = self.objects[indexPath.row];
        [[segue destinationViewController] setDetailItem:object];
    }
}

#pragma mark - Table View

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    
    return [dataArray count];
    
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
    
    cell.textLabel.text = [[dataArray objectAtIndex:indexPath.row]objectForKey:@"A_Name_Ch"];
    return cell;
}

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
    // Return NO if you do not want the specified item to be editable.
    return YES;
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        [self.objects removeObjectAtIndex:indexPath.row];
        [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
    } else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
    }
}

@end