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Question

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我正在尝试在我的tableview中实现一个自定义单元格

这是我的自定义单元格接口类

@interface CustomCell : UITableViewCell {
    IBOutlet UILabel *nameLabel;
    IBOutlet UITextView *inputText;
    IBOutlet UIImageView *image;
    IBOutlet UIButton *btnBuy;
}

@property (nonatomic, retain) IBOutlet UILabel *nameLabel;
@property (nonatomic, retain) IBOutlet UITextView *inputText;
@property (nonatomic, retain) IBOutlet UIImageView *image;
@property (nonatomic, retain) IBOutlet UIButton *btnBuy;

@end

这是我的视图控制器

#import "CustomCellProjectViewController.h"

@implementation CustomCellProjectViewController

@synthesize nameLabel, inputText, image, btnBuy, listData;

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    image = [[UIImageView alloc] init];
    btnBuy = [[UIButton alloc] init];
    inputText = [[UITextView alloc] init];
    nameLabel = [[UILabel alloc] init];

    NSDictionary *row1 = [[NSDictionary alloc] initWithObjectsAndKeys:image, @"image", inputText, @"text", nameLabel, @"label", btnBuy, @"button", nil];

    NSArray *array = [[NSArray alloc] initWithObjects:row1, nil];
    self.listData = array;

    [row1 release];
    [array release];
    [super viewDidLoad];
}

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

- (void)viewDidUnload {
    self.listData = nil;
}


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

#pragma mark -
#pragma mark Table View Data Source Methods
- (NSInteger)tableView:(UITableView *)tableView
 numberOfRowsInSection:(NSInteger)section {
    return [self.listData count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView
         cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CustomCellIdentifier = @"CustomCellIdentifier";

    CustomCell *cell = (CustomCell *)[tableView dequeueReusableCellWithIdentifier:CustomCellIdentifier];
    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"CustomCell" owner:self options:nil];
        for (id oneObject in nib)
            if ([oneObject isKindOfClass:[CustomCell class]]) {
                cell = (CustomCell *)oneObject;
            }
    }
    return cell;
}

- (NSIndexPath *)tableView:(UITableView *)tableView
willSelectRowAtIndexPath:(NSIndexPath *) indexPath{
    NSUInteger row = [indexPath row];
    if (row == 0)
        return nil;
    return indexPath;
}

- (void)tableView:(UITableView *)tableView
didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    NSUInteger row = [indexPath row];
    NSString *rowValue = [listData objectAtIndex:row];
    NSString *message = [[NSString alloc] initWithFormat:@"You selected %@", rowValue];

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Row Selection" message:message delegate:nil cancelButtonTitle:@"Okay" otherButtonTitles:nil];
    [alert show];
    [message release];
    [alert release];
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
}

- (CGFloat) tableView:(UITableView *)tableView
heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return kTableViewRowHeight;
}

@end

但是我收到了一个错误：

UITableView dataSource必须返回一个细胞来自的tableView：的cellForRowAtIndexPath：

细胞仍为零

有人可以帮我吗？

Answer 1

至于我，我会手动为CustomCell编写代码。然后，我可以使用 -cellForRowAtIndexPath 中的单元格。

- (UITableViewCell *)tableView:(UITableView *)tableView
         cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{
    static NSString *CustomCellIdentifier = @"CustomCellIdentifier";

    CustomCell *cell = (CustomCell *)[tableView dequeueReusableCellWithIdentifier:CustomCellIdentifier];
    if (cell == nil)
    { 
        cell = [[[CustomCell alloc] initByMyWayWithIdentifier:CustomCellIdentifier] autorelease];
    }

    // assign necessary information to cell

    return cell;
}

Answer 2

我发现从xib文件获取单元格的方式非常可疑。不知道这是不是问题（调试到该方法时会发生什么？）。

您的CustomCell是否需要在单独的xib中，您是否在不同的VC中使用它？如果没有，您可以尝试将其粘贴到VC的xib中，然后只需创建一个IBOutlet并将其连接到CustomCell。

UITableView dataSource必须从tableView返回一个单元格：cellForRowAtIndexPath：

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2 个答案: