Question

我对Objective C很新，所以调试这个问题变得相当令人沮丧。我正在尝试设置一个UITableView，它只是查询数据库并列出返回的对象。我尝试按照Apple的“SQL Books”示例进行示例，但它似乎没有起作用。我很确定此时表格视图根本没有加载数据，因为numberOfRowsInSection正在触发。

以下是.m文件的代码：

#import "MainViewController.h"
#import "CardCell.h"
#import "YgoRulesAppDelegate.h"
#import "Card.h"

@implementation MainViewController

@synthesize managedObjectContext;
@synthesize tblSimpleTable;


// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
    [tblSimpleTable setDelegate:self];
    [tblSimpleTable setDataSource:self];
}

 // Implement viewWillAppear: to do additional setup before the view is presented. You might, for example, fetch objects from the managed object context if necessary.
- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
}


- (void)flipsideViewControllerDidFinish:(FlipsideViewController *)controller {

    [self dismissModalViewControllerAnimated:YES];
}


- (IBAction)showInfo:(id)sender {    

    FlipsideViewController *controller = [[FlipsideViewController alloc] initWithNibName:@"FlipsideView" bundle:nil];
    controller.delegate = self;

    controller.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self presentModalViewController:controller animated:YES];

    [controller release];
}


- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc. that aren't in use.
}


- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


/*
 // Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations.
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
 */


- (void)dealloc {
    [managedObjectContext release];
    [super dealloc];
}

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

// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection: (NSInteger)section
{
    YgoRulesAppDelegate *appDelegate = (YgoRulesAppDelegate *) [[UIApplication sharedApplication] delegate];

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Info" message:appDelegate.cards.count delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert show];
    [alert release];

    return appDelegate.cards.count;
}

// Customize the appearance of the table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    CardCell *cell = (CardCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if(cell == nil)
    {
        cell = [[[CardCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
    }

    YgoRulesAppDelegate *appDelegate = (YgoRulesAppDelegate *)[[UIApplication sharedApplication] delegate];
    Card *card = [appDelegate.cards objectAtIndex:indexPath.row];

    [cell setCard:card];

    // Set up the cell
    return cell;
}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{

}

@end

这是.h文件的代码

#import "FlipsideViewController.h"
#import <CoreData/CoreData.h>

@interface MainViewController : UIViewController <FlipsideViewControllerDelegate, UITableViewDelegate, UITableViewDataSource> {
    NSManagedObjectContext *managedObjectContext;
    IBOutlet UITableView *tblSimpleTable;
}

@property (nonatomic, retain) NSManagedObjectContext *managedObjectContext;
@property (nonatomic, retain) IBOutlet UITableView *tblSimpleTable;

- (IBAction)showInfo:(id)sender;

@end

以下是界面生成器的设置（抱歉，我不会将其作为图片包含在内）：http://i.stack.imgur.com/5L7OX.png

UiTableView没有加载任何数据

0 个答案: