Question

我有一个plist文件，内容如下（源视图）：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
    <dict>
        <key>Title</key>
        <string> Food</string>
        <key>Rows</key>
        <array>
            <dict>
                <key>name</key>
                <string>Chunky Chips</string>
                <key>price</key>
                <string>25,-</string>
            </dict>
            <dict>
                <key>name</key>
                <string>Chunky Chips w/ Cheese</string>
                <key>price</key>
                <string>29,-</string>
            </dict>
            <dict>
                <key>name</key>
                <string>Fish'n'Chips</string>
                <key>price</key>
                <string>89,-</string>
            </dict>
        </array>
    </dict>
    <dict>
        <key>Title</key>
        <string>Snacks</string>
        <key>Rows</key>
        <array>
            <dict>
                <key>name</key>
                <string>Crisps</string>
                <key>price</key>
                <string>15,-</string>
            </dict>
            <dict>
                <key>name</key>
                <string>Hot Nuts</string>
                <key>price</key>
                <string>20,-</string>
            </dict>
            <dict>
                <key>name</key>
                <string>Popcorn</string>
                <key>price</key>
                <string>25,-</string>
            </dict>
        </array>
    </dict>
    <dict>
        <key>Title</key>
        <string>Draught Beer</string>
        <key>Rows</key>
        <array>
            <dict>
                <key>name</key>
                <string>The Ale</string>
                <key>price</key>
                <string>47,-</string>
            </dict>
            <dict>
                <key>name</key>
                <string>Carlsberg</string>
                <key>price</key>
                <string>47,-</string>
            </dict>
            <dict>
                <key>name</key>
                <string>Kilkenny</string>
                <key>price</key>
                <string>47,-</string>
            </dict>
        </array>
    </dict>
</array>
</plist>

我的TableViewController：

#import "MenuViewController.h"

@interface MenuViewController ()

@property (copy, nonatomic) NSArray* tableData;

@end

@implementation MenuViewController

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.tableData = [NSArray arrayWithContentsOfFile: [[NSBundle mainBundle] pathForResource: @"TestList" ofType: @"plist"]];
    NSLog(@"%@",_tableData);

    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:(BOOL)animated];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
        return [_tableData count];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    //return [[[_tableData objectAtIndex: section] objectForKey: @"Rows"] count];
    NSDictionary *dataInSection = [[_tableData objectAtIndex: section] objectForKey: @"Rows"];
    return [dataInSection count];
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {

    return [[_tableData objectAtIndex: section] objectForKey: @"Title"];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"MenuCell";
    UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    cell.textLabel.text = [[[_tableData objectAtIndex: indexPath.section] objectForKey: @"name"] objectAtIndex: indexPath.row];
    cell.detailTextLabel.text = [[[_tableData objectAtIndex:indexPath.section] objectForKey:@"price"]objectAtIndex: indexPath.row];

    return cell;
}

我想用表格显示表格。剖面图显示出来，但没有内容。我从nslog获得以下内容：

(
        {
        Rows =         (
                        {
                name = "Chunky Chips";
                price = "25,-";
            },
                        {
                name = "Chunky Chips w/ Cheese";
                price = "29,-";
            },
                        {
                name = "Fish'n'Chips";
                price = "89,-";
            }
        );
        Title = " Food";
    },
        {
        Rows =         (
                        {
                name = Crisps;
                price = "15,-";
            },
                        {
                name = "Hot Nuts";
                price = "20,-";
            },
                        {
                name = Popcorn;
                price = "25,-";
            }
        );
        Title = Snacks;
    },
        {
        Rows =         (
                        {
                name = "The Ale";
                price = "47,-";
            },
                        {
                name = Carlsberg;
                price = "47,-";
            },
                        {
                name = Kilkenny;
                price = "47,-";
            }
        );
        Title = "Draught Beer";
    }
)

知道为什么tablecells没有填写相应的名称和价格吗？

Answer 1

这是一个很好的例子，说明为什么你不应该在一行上进行如此长的嵌套方法调用。你的行：

cell.textLabel.text = [[[_tableData objectAtIndex: indexPath.section] objectForKey: @"name"] objectAtIndex: indexPath.row];

应该是：

NSDictionary *sectionData = _tableData[indexPath.section];
NSArray *rowsData = sectionData[@"Rows"];
NSDictionary *rowData = rowsData[indexPath.row];
NSString *name = rowData[@"name"];
NSString *price = rowData[@"price"];

cell.textLabel.text = name;
cell.detailTextLabel.text = price;

您拥有它的方式，您忘记获取Rows密钥的数据。

像我一样分裂线条有很多好处。对于每个单元，没有理由不得不多次查找段数据，行数据和行数据。所以这更有效率。拆分代码也使调试变得更加容易，并使其更易于阅读。

Answer 2

cell.textLabel.text = [[[_tableData objectAtIndex: indexPath.section] objectForKey: @"name"] objectAtIndex: indexPath.row];
cell.detailTextLabel.text = [[[_tableData objectAtIndex:indexPath.section] objectForKey:@"price"]objectAtIndex: indexPath.row];

应该（冒昧地使用文字）

cell.textLabel.text = _tableData[indexPath.section][@"Rows"][indexPath.row]@"name"];
cell.detailTextLabel.text = _tableData[indexPath.section][@"Rows"][indexPath.row][@"price"];

Answer 3

您错过了引用名为“行”的键。这是一个可能的解决方案：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"MenuCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
    }

    NSDictionary *product = [[[_tableData objectAtIndex:indexPath.section] objectForKey:@"Rows"] objectAtIndex:indexPath.row];
    cell.textLabel.text = [product objectForKey:@"name"];
    cell.detailTextLabel.text = [product objectForKey:@"price"];

    return cell;
}

来自plist的分段UITableview

3 个答案: