Question

我已经设置了一个UITableView，它有3个部分，每个部分有3行。我使用以下代码来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];

这一切都运转正常，直到今晚我在行中文字左侧添加了图片。图像显示完美，但由于某种原因，行全部填充了来自beveragesData的对象，它完全忽略了其他两组对象。代码低于我使用过的代码。我希望它只是简单地编写if语句就可以了。

- (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，当运行时，UITableView的所有9行都填充了beveragesData中的对象。任何帮助将不胜感激。

由于

Answer 1

Objective-c结构不是基于缩进

此：

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]];
        }

就像C / C ++ / Java - if适用于下一个语句。如果需要多个，则需要将语句括在花括号中。你也可以把所有的时间放在一起，不用担心。

此外，此代码

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

不按照您的想法行事。第一次返回总是运行，后两行被忽略（应该已经发出警告）。

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. */

UITableViewCell问题indexPath.row无法正确显示

3 个答案: