目标C语言 UITableViewCell发出indexPath.行不能正确显示

Question

我已经设置了一个UITableView，其中有3个部分，在每个3行。我使用下面的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];

这一切都工作得很好，直到今天晚上，当我在行的文本左侧添加图像。图像显示得很好，但由于某种原因，所有行都填充了来自beveragesData的对象，并且完全忽略了其他两组对象。下面是我使用的代码。我希望这是一些简单的事情，只是写错了if语句。

- (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行都用来自beveragesData的对象填充。如有任何帮助，我将不胜感激。

谢谢

Answer 1

Objective-c结构不基于缩进

:

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

应:

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语句应用于下一个语句。如果需要多个语句，则需要将语句用花括号括起来。你也可以一直画卷，这样就不用担心了。

同样，这段代码

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

并不像你想象的那样。总是运行第一个返回，而忽略第二个两行(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语句:

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. */