Question

我有这个基本的购物清单应用，在第一个视图中有两个文本字段。一个是项目的名称，另一个是项目quantitiy。一旦用户键入这两个条目并按下保存按钮，应用程序将切换到表视图控制器，其中条目首先存储在名为item的对象中，然后将对象存储到项目数组中。然后，我实现了所有必需的表视图方法，并将项目显示在表视图中。可悲的是，没有任何东西在展示。保存条目时，表格视图显示为空白。在对NSLog进行一些调试之后，我发现没有调用关键方法tableviewcellForRowAtIndexPath。我发现其他人有一个类似的问题，解决方案是将tableviewcontroller设置为委托，我试过但它没有用。你知道我的代码有什么问题吗？感谢。

这是第一张图片的视图控制器，然后我将向您展示我的tableviewController代码

   #import "TVViewController.h"
#import "TableViewController.h"
//#import "TableViewController.m"

@implementation TVViewController
@synthesize title;//one of the text fields
@synthesize subtitle;//the other text field

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"Save"]) {
        NSString *string1 = self.title.text;
        NSString *string2 = self.subtitle.text;
        [segue.destinationViewController addName: string1 andNumber:string2];
    }
}




- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

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

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

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

@end

这是我的viewcontroller 这是我的表视图控制器，忽略那些用于调试目的的nslog

 #import "TableViewController.h"
#import "Item.h"

@implementation TableViewController

@synthesize items;

-(void) addName:(NSString *) name
      andNumber:(NSString *) numberOfItems
{
    Item *item = [[Item alloc] init];
    item.itemName = name;
    item.itemQuantity = numberOfItems;
    [self.items addObject:item];
    NSLog(@"Data has been passed");

}


- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {

    }

    return self;
}

- (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.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];


    NSLog(@"VIew is ready");
    //[self.tableView reloadData];



    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
}

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

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

#pragma mark - Table view data source



- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    NSLog(@"list initialized by count");
    // Return the number of rows in the section.

    return [self.items count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Item in cart";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

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

    // Configure the cell...

    Item *item = [self.items objectAtIndex:indexPath.row];
    cell.textLabel.text = item.itemName;
    cell.detailTextLabel.text = item.itemQuantity;
    return cell;

}

Answer 1

据我记得你需要为此设置tableVeiw的dataSource，delegate用于接收事件

http://developer.apple.com/library/ios/#documentation/uikit/reference/UITableViewDataSource_Protocol/Reference/Reference.html#//apple_ref/occ/intf/UITableViewDataSource

tableviewcellForRowAtIndexPath未被调用

1 个答案: