IOS-IB：在UIViewcontroller中使用UITableView，请帮助我

我是IOS新手，使用IB，我在UIViewController中使用UITableView，我在viewcontroller和setdelegate中实现了“UITableViewDelegate，UITableViewDataSource”，但它不工作，我不知道

请帮帮我

感谢您阅读本文

代码viewcontroller.h

@interface ViewController : UIViewController<UITableViewDelegate,
UITableViewDataSource> @property (nonatomic, retain) IBOutlet UITableView *tableView;

---

首先，从不分配单元格，而不是执行if（simple_cell==nil），您应该执行if（customize_cell==nil）并在那里执行初始化代码。否则，您将比较刚创建的字符串并将值设置为nil。

这行代码中的问题是：

CustomizeCell_Home *customize_cell = (CustomizeCell_Home *)[tableView dequeueReusableCellWithIdentifier:simple_cell];
if (simple_cell == nil) 
{}

如果

customize_cell

为

nil

，会发生什么情况

您没有实例化

customize\u单元格

，因此无法调用以下方法：

customize_cell.imageView.image = image;
customize_cell.lbldescription.text =[dataTable objectForKey:@"LongDescription"];
customize_cell.lblTitle.text =  [dataTable objectForKey:@"VName"];
customize_cell.lblTitle.lineBreakMode = UILineBreakModeWordWrap | UILineBreakModeTailTruncation;
customize_cell.lbldescription.lineBreakMode = UILineBreakModeWordWrap | UILineBreakModeTailTruncation;
customize_cell.lbldescription.numberOfLines=4;
customize_cell.contentView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"bgtblRight.png"]];
return customize_cell;

只需在if中添加一个简单的inicialize单元格，如下所示：

if (customize_cell == nil) 
{
  customize_cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:@"AnIdentifierString"] autorelease];
}

编辑

更改此项：

CustomizeCell_Home *customize_cell = (CustomizeCell_Home *)[tableView dequeueReusableCellWithIdentifier:simple_cell];
if (simple_cell == nil) 
{}

customize_cell.lbldescription.text =[dataTable objectForKey:@"LongDescription"];
customize_cell.lblTitle.text =  [dataTable objectForKey:@"VName"];
customize_cell.lblTitle.lineBreakMode = UILineBreakModeWordWrap | UILineBreakModeTailTruncation;
customize_cell.lbldescription.lineBreakMode = UILineBreakModeWordWrap | UILineBreakModeTailTruncation;
customize_cell.lbldescription.numberOfLines=4;
customize_cell.contentView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"bgtblRight.png"]];
return customize_cell;

致：

设定

桌面视图。数据源=自我
桌面视图。代表=自我

实施协议，该协议被指定为@必需的意思是说必需的

-(UITableViewCell*) tableView: (UITableView *) tableView cellForRowAtIndexPath: (NSIndexPath *) indexPath 
{
    // dint concentrate on this part, hope u are right
    NSDictionary *dataTable = [listDataTable objectAtIndex:indexPath.row];  
    NSData *receivedData = [NSData dataWithContentsOfURL:[NSURL URLWithString:[[dataTable objectForKey:@"Thumbnail"]objectForKey:@"Url1"]]];    
    UIImage *image = [[[UIImage alloc] initWithData:receivedData] stretchableImageWithLeftCapWidth:50 topCapHeight:80];

    static NSString *simple_cell = @"simpleCell";
    // works like double ended queue.... cells are re-used when available... so when cell is nil, u need to create
    CustomizeCell_Home *customize_cell = (CustomizeCell_Home *)[tableView dequeueReusableCellWithIdentifier:simple_cell];  
    if (simple_cell == nil) 
    {
         // CustomizeCell_Home is linked to CustomizeCell_Home_Reference using nib,
         [[NSBundle mainBundle] loadNibNamed: @"CustomizeCell_Home" owner: self options: nil];

         customize_cell = CustomizeCell_Home_Reference;
    }
    .....  
    .....  
    return customize_cell;

---

}

hi CBredlow，我想在uiviewcontroller中显示uitableview？我为它设置了Delegate和datasource，但不想让您失望，但是

simple_cell

是一个

静态NSString

是的，我编辑了这样的内容：customize_cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simple_cell]；你好，nicos karalis，我声明我和你一样，但是uitableview仍然没有显示数据。请将它放到github上，并在这里发布链接。这种方法更简单只是为了确定，您是否100%确定您的

listDataTable

不是空的？或者你加载的json真的被加载了？这个链接是我的项目，希望能得到你的帮助，因为我已经看过你的代码了，我没有发现任何问题。你检查过被解析的json了吗？我无法检查您的服务器是否提供了正确的answare，但请检查NSData是否为nil，并将NSLog放在这一行的后面

listDataTable=[jsonTable objectForKey:@“List”]

为了查看这个数组是否被填充Hi，Ashwin Kumar，我再次检查了代码，我不知道为什么它不起作用&没有显示错误：（你可以发布代码…这样我就不必担心问题了…你是如何创建自定义cell_home这个链接我的代码，mocku.ps/2mhyhg中的JSon视图，我设置了委托和数据源，但它不起作用。。。

CustomizeCell_Home *customize_cell = (CustomizeCell_Home *)[tableView dequeueReusableCellWithIdentifier:simple_cell];
if (customize_cell == nil) 
{
  customize_cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:@"AnIdentifierString"] autorelease];
}

customize_cell.lbldescription.text =[dataTable objectForKey:@"LongDescription"];
customize_cell.lblTitle.text =  [dataTable objectForKey:@"VName"];
customize_cell.lblTitle.lineBreakMode = UILineBreakModeWordWrap | UILineBreakModeTailTruncation;
customize_cell.lbldescription.lineBreakMode = UILineBreakModeWordWrap | UILineBreakModeTailTruncation;
customize_cell.lbldescription.numberOfLines=4;
customize_cell.contentView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"bgtblRight.png"]];
return customize_cell;

-(UITableViewCell*) tableView: (UITableView *) tableView cellForRowAtIndexPath: (NSIndexPath *) indexPath 
{
    // dint concentrate on this part, hope u are right
    NSDictionary *dataTable = [listDataTable objectAtIndex:indexPath.row];  
    NSData *receivedData = [NSData dataWithContentsOfURL:[NSURL URLWithString:[[dataTable objectForKey:@"Thumbnail"]objectForKey:@"Url1"]]];    
    UIImage *image = [[[UIImage alloc] initWithData:receivedData] stretchableImageWithLeftCapWidth:50 topCapHeight:80];

    static NSString *simple_cell = @"simpleCell";
    // works like double ended queue.... cells are re-used when available... so when cell is nil, u need to create
    CustomizeCell_Home *customize_cell = (CustomizeCell_Home *)[tableView dequeueReusableCellWithIdentifier:simple_cell];  
    if (simple_cell == nil) 
    {
         // CustomizeCell_Home is linked to CustomizeCell_Home_Reference using nib,
         [[NSBundle mainBundle] loadNibNamed: @"CustomizeCell_Home" owner: self options: nil];

         customize_cell = CustomizeCell_Home_Reference;
    }
    .....  
    .....  
    return customize_cell;