为什么我的tableView不显示对象？

Question

First of I would like to start with I am 100% new to iPhone development. I believe this is a quite simple question for someone experienced. Anyhow, what I am trying to do is:

The user should via the SearchUI be able to search for objects from my database. If the object exist, display it in the tableView where the search-objects will be displayed. I manage to get the objects from the database but not instance them into the tableview and display them.

Honestly I don't know what I am doing wrong. All help will be really appreciated and also some explaining if possible. Under method - (void)objectLoader:(RKObjectLoader *)objectLoader didLoadObjects:(NSArray *)objects - I try to move the objects into the tableView without any success. You find the method in FirstViewController.m at the end of pragma mark TableView Data Scource methods. Here is my code:

FirstViewController.h class

#import <UIKit/UIKit.h>
#import <RestKit/RestKit.h>

@interface FirstViewController : UIViewController <UITableViewDataSource,           RKObjectLoaderDelegate>
{ 
UISearchDisplayController *searchDisplayController;
UISearchDisplayController *searchBar;
UITableView *table;
NSArray *allItems;
NSArray *searchResults;

}

@property (nonatomic, retain) IBOutlet UISearchDisplayController     *searchDisplayController;
@property (nonatomic, retain) IBOutlet UISearchDisplayController *searchBar;
@property (nonatomic, retain) IBOutlet UITableView *table;
@property (nonatomic, copy) NSArray *allItems;
@property (nonatomic, copy) NSArray *searchResults;
@end

FirstViewController.m class

#import "FirstViewController.h"
#import "Task.h"

interface FirstViewController ()

end

implementation FirstViewController

@synthesize searchDisplayController;
@synthesize searchBar;
@synthesize allItems;
@synthesize searchResults;
@synthesize table;

#pragma mark - View lifecycle

- (void)viewDidLoad
{
//self.listContent = [[NSArray alloc] initWithObjects:@"John", @"Paul", nil];

//self.filteredListContent = [NSMutableArray arrayWithCapacity:10];

[super viewDidLoad];    // Do any additional setup after loading the view, typically  from a nib.
}

- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}

- (BOOL)shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation
{
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
else
{
    return YES;
}
}


-(BOOL)searchDisplayController:(UISearchDisplayController *)controller   shouldReloadTableForSearchString:(NSString *)searchString
{
return NO;
}

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller  shouldReloadTableForSearchScope:(NSInteger)searchOption
{
return NO;
}


- (void)searchBarSearchButtonClicked:(UISearchBar *)pSearchBar
{
[[RKObjectManager sharedManager].mappingProvider setMapping:[Task getMapping]  forKeyPath:@"tasks"];

NSString *path = [NSString stringWithFormat:@"%@/%@/%@", @"/book/1/tasks/", pSearchBar.text, @".json"];
[[RKObjectManager sharedManager] loadObjectsAtResourcePath:path delegate:self];
NSLog(@"Search: %@", pSearchBar.text);  
}

#pragma mark - TableView Data Scource methods

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

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

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
{
UITableViewCell *cell = nil;

cell = [tableView dequeueReusableCellWithIdentifier:@"MyCell"];

if(cell == nil)
{
    cell =  [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault  reuseIdentifier:@"MyCell"];
}

cell.textLabel.text = [self.searchResults objectAtIndex:indexPath.row];
return cell;
}

- (void) deselect { 
//[self.tableView deselectRowAtIndexPath:[self.tableView indexPathForSelectedRow]  animated:YES];
 }

// Respond to user selection tap by coloring the navigation bar
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath  *)newIndexPath
{

}


- (void)objectLoader:(RKObjectLoader *)objectLoader didLoadObjects:(NSArray *)objects
{
self.searchResults = objects;

[self.table reloadData];


for(Task *task in objects)
{
    if ([task isKindOfClass:[Task class]])
    {
        NSLog(@"Loaded Book ID: %@ ; Name: %@ ; Book: %@", task.id, task.name,  task.book.name);  
    }
}

}

- (void)objectLoader:(RKObjectLoader *)objectLoader didFailWithError:(NSError *)error
{
NSLog(@"Encountered an error: %@", error);  
}
@end

Answer 1

Step1. Since your TableView is an IBOutlet, check you tableView datasource and delegate mappings in the .xib file for this view controller. My doubt is that the hooking is not correct.

Step2. If the hook ups in .xib file are correct, then you should do

- (void)objectLoader:(RKObjectLoader *)objectLoader didLoadObjects:(NSArray *)objects
{
   self.searchResults = objects;
   NSLog(@"%@", searchResults)
   [self.table reloadData];

....
}

and check if the NSLog is logging the searchResults array. If that's empty for some reason, your numberOfRowsInSection delegate method will return 0 and hence your tableView will be empty.

Hope this helps.

Answer 2

in the first line

@interface FirstViewController : UIViewController <UITableViewDataSource,           RKObjectLoaderDelegate>
 { 
UISearchDisplayController *searchDisplayController;
UISearchDisplayController *searchBar;
UITableView *table;
NSArray *allItems;
NSArray *searchResults;
}

replace this line with below code

@interface FirstViewController : UIViewController <UITableViewDataSource, UITableViewDelegate, RKObjectLoaderDelegate>
 { 
UISearchDisplayController *searchDisplayController;
UISearchDisplayController *searchBar;
IBOutlet UITableView *table;
NSArray *allItems;
NSArray *searchResults;
}

and connect the tableview delegate and tableview datasource in interface builder.

Hope it helps.