UITableViewCell 问题 indexPath.row 无法正确显示

Question

我设置了一个 UITableView，它有 3 个部分，每个部分有 3 行。我已经使用以下代码指定我希望某些数组中的对象显示为行内容；

    recipeData = [[NSArray alloc] initWithObjects:@"Chicken & Veg Rissoto",@"Super Healthy Pizza",@"Salmon Burgers",nil];
    dessertsData = [[NSArray alloc] initWithObjects:@"Raspberry Parfaits",@"ChocNana YumYum",@"Grilled Choc Sandwich",nil];
    beveragesData = [[NSArray alloc] initWithObjects:@"Berry Smoothie",@"Banana Berry Smoothie",@"Cocoa Soy Smoothie",nil];
    [self setTitle:@"Recipe Table"];
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 3;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [self.recipeData count];
    return [self.dessertsData count];
    return [self.beveragesData count];

这一切都很好，直到今天晚上我在行中文本的左侧添加了图像。图像显示完美，但由于某种原因，这些行都填充了饮料数据中的对象，它完全忽略了其他两组对象。代码在我用过的下面。我希望它就像错误地编写 if 语句一样简单。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *SimpleTableIdentifier = @"SimpleTableIdentifier"; 
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: SimpleTableIdentifier];

    if (cell == nil) { cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:SimpleTableIdentifier] autorelease];
    }   
    if(indexPath.section == 0) 
        if(indexPath.row == 0)
            [cell.imageView setImage:[UIImage imageNamed:@"Main0.png"]];
            [cell.textLabel setText:[recipeData objectAtIndex:indexPath.row]];
    if(indexPath.section == 0) 
        if(indexPath.row == 1)
            [cell.imageView setImage:[UIImage imageNamed:@"Main1.png"]];
            [cell.textLabel setText:[recipeData objectAtIndex:indexPath.row]];
    if(indexPath.section == 0)
        if(indexPath.row == 2)
            [cell.imageView setImage:[UIImage imageNamed:@"Main2.png"]];
            [cell.textLabel setText:[recipeData objectAtIndex:indexPath.row]];

   if(indexPath.section == 1)
        if(indexPath.row == 0)
            [cell.imageView setImage:[UIImage imageNamed:@"Dessert0.png"]];
            [cell.textLabel setText:[dessertsData objectAtIndex:indexPath.row]];
    if(indexPath.section == 1)
        if(indexPath.row == 1)
            [cell.imageView setImage:[UIImage imageNamed:@"Dessert1.png"]];
            [cell.textLabel setText:[dessertsData objectAtIndex:indexPath.row]];
    if(indexPath.section == 1)
        if(indexPath.row == 2)
            [cell.imageView setImage:[UIImage imageNamed:@"Dessert2.png"]];
            [cell.textLabel setText:[dessertsData objectAtIndex:indexPath.row]];

   if (indexPath.section == 2)
        if(indexPath.row == 0)
            [cell.imageView setImage:[UIImage imageNamed:@"Drink0.png"]];
            [cell.textLabel setText:[beveragesData objectAtIndex:indexPath.row]];
    if(indexPath.section == 2)
        if(indexPath.row == 1)
            [cell.imageView setImage:[UIImage imageNamed:@"Drink1.png"]];
            [cell.textLabel setText:[beveragesData objectAtIndex:indexPath.row]];
    if(indexPath.section == 2)
        if(indexPath.row == 2)
            [cell.imageView setImage:[UIImage imageNamed:@"Drink2.png"]];
            [cell.textLabel setText:[beveragesData objectAtIndex:indexPath.row]];
    return cell;

所以目前，当它运行时，UITableView 的所有 9 行都填充了来自饮料数据的对象。任何帮助将不胜感激。

谢谢

Answer 1

Objective-c 结构不是基于缩进的

这个：

if(indexPath.section == 0) 
        if(indexPath.row == 0)
            [cell.imageView setImage:[UIImage imageNamed:@"Main0.png"]];
            [cell.textLabel setText:[recipeData objectAtIndex:indexPath.row]];

应该是：

if(indexPath.section == 0) 
        if(indexPath.row == 0) {
            [cell.imageView setImage:[UIImage imageNamed:@"Main0.png"]];
            [cell.textLabel setText:[recipeData objectAtIndex:indexPath.row]];
        }

这就像 C/C++/Java —— if 适用于下一条语句。如果您需要多个语句，则需要将语句括在花括号中。你也可以一直用卷发来不用担心。

还有，这段代码

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

不做你认为它做的事。第一个返回总是运行，后两行被忽略（应该得到一个警告）。

Answer 2

您的numberOfRowsInSection: 部分也不正确；应该是：

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if ( section == 0 )        
        return [self.recipeData count];
    if ( section == 1 )
        return [self.dessertsData count];
    if ( section == 3 )
        return [self.beveragesData count];
}

Answer 3

您还应该使用switch 声明：

switch ( indexPath.section ) 
{
    case 0:
    {
        if(indexPath.row == 0) {
            [cell.imageView setImage:[UIImage imageNamed:@"Main0.png"]];
            [cell.textLabel setText:[recipeData objectAtIndex:indexPath.row]];
        }
        if(indexPath.row == 1) {
            [cell.imageView setImage:[UIImage imageNamed:@"Main1.png"]];
            [cell.textLabel setText:[recipeData objectAtIndex:indexPath.row]];
        }
        if(indexPath.row == 2) {
            [cell.imageView setImage:[UIImage imageNamed:@"Main2.png"]];
            [cell.textLabel setText:[recipeData objectAtIndex:indexPath.row]];
        }
    }
}

/* etc. */