Viewcontroller.m不执行代码

Question

我刚刚制作了一个项目，并且我使用了此网站的代码：http://codewithchris.com/iphone-app-connect-to-mysql-database/

问题当然是ViewController.m。它中的代码没有执行，我已经尝试将NSLog(@"Test With NSLog");放在ViewController.m中，但没有任何反应。来自＆＃34; site_url＆＃34;的JSON东西一切都很好。

以下是所有代码：

ViewController.h

#import <UIKit/UIKit.h>
#import "HomeModel.h"

@interface ViewController : UIViewController <UITableViewDataSource, UITableViewDelegate,     HomeModelProtocol>

@property (weak, nonatomic) IBOutlet UITableView *listTableView;

@end

ViewController.m

#import "ViewController.h"
#import "Location.h"

@interface ViewController ()
{
HomeModel *_homeModel;
NSArray *_feedItems;
}
@end

@implementation ViewController

- (void)viewDidLoad
{
[super viewDidLoad];

// Set this view controller object as the delegate and data source for the table view
self.listTableView.delegate = self;
self.listTableView.dataSource = self;

// Create array object and assign it to _feedItems variable
_feedItems = [[NSArray alloc] init];

// Create new HomeModel object and assign it to _homeModel variable
_homeModel = [[HomeModel alloc] init];

// Set this view controller object as the delegate for the home model object
_homeModel.delegate = self;

// Call the download items method of the home model object
[_homeModel downloadItems];
}

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

-(void)itemsDownloaded:(NSArray *)items
{
// This delegate method will get called when the items are finished downloading

// Set the downloaded items to the array
_feedItems = items;

// Reload the table view
[self.listTableView reloadData];

}

#pragma mark Table View Delegate Methods

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of feed items (initially 0)
return _feedItems.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath      *)indexPath
{
// Retrieve cell
NSString *cellIdentifier = @"BasicCell";
UITableViewCell *myCell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];

// Get the location to be shown
Location *item = _feedItems[indexPath.row];

// Get references to labels of cell
myCell.textLabel.text = item.username;

return myCell;
}

@end

HomeModel.h

#import <Foundation/Foundation.h>

@protocol HomeModelProtocol <NSObject>

- (void)itemsDownloaded:(NSArray *)items;

@end

@interface HomeModel : NSObject <NSURLConnectionDataDelegate>

@property (nonatomic, weak) id<HomeModelProtocol> delegate;

- (void)downloadItems;

@end

HomeModel.m

#import "HomeModel.h"
#import "Location.h"

@interface HomeModel()
{
NSMutableData *_downloadedData;
}
@end

@implementation HomeModel

- (void)downloadItems
{
// Download the json file
NSURL *jsonFileUrl = [NSURL URLWithString:@"site_url"];

// Create the request
NSURLRequest *urlRequest = [[NSURLRequest alloc] initWithURL:jsonFileUrl];

// Create the NSURLConnection
[NSURLConnection connectionWithRequest:urlRequest delegate:self];
}

#pragma mark NSURLConnectionDataProtocol Methods

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
// Initialize the data object
_downloadedData = [[NSMutableData alloc] init];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// Append the newly downloaded data
[_downloadedData appendData:data];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// Create an array to store the locations
NSMutableArray *_locations = [[NSMutableArray alloc] init];

// Parse the JSON that came in
NSError *error;
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:_downloadedData options:NSJSONReadingAllowFragments error:&error];

// Loop through Json objects, create question objects and add them to our questions array
for (int i = 0; i < jsonArray.count; i++)
{
    NSDictionary *jsonElement = jsonArray[i];

    // Create a new location object and set its props to JsonElement properties
    Location *newLocation = [[Location alloc] init];
    newLocation.username = jsonElement[@"Username"];
    newLocation.email = jsonElement[@"Email"];
    newLocation.money = jsonElement[@"money"];

    // Add this question to the locations array
    [_locations addObject:newLocation];
}

// Ready to notify delegate that data is ready and pass back items
if (self.delegate)
{
    [self.delegate itemsDownloaded:_locations];
}
}

@end

Location.h

#import <Foundation/Foundation.h>

@interface Location : NSObject

@property (nonatomic, strong) NSString *username;
@property (nonatomic, strong) NSString *email;
@property (nonatomic, strong) NSString *money;

@end

Location.m

#import "Location.h"

@implementation Location

@end