表视图在首次向下钻取后未填充

Question

我有一个来自pList的分段表视图，我想向下钻取到子子视图。我唯一的问题是，在第一次向下钻取（Entree是唯一有内容的），"描述"和"标题"之后，我坚持要填充它。

pList

<?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>Rows</key>
        <array>
            <dict>
                <key>Title</key>
                <string>Entree</string>
                <key>Children</key>
                <array>
                    <dict>
                        <key>Title</key>
                        <string>Garlic Bread</string>
                        <key>Description</key>
                        <string>Cottage loaf smeared with garlic butter and herbs</string>
                        <key>Price</key>
                        <string>8.0</string>
                    </dict>
                    <dict>
                        <key>Title</key>
                        <string>Bruschetta</string>
                        <key>Description</key>
                        <string>Veggies n shit on toast</string>
                        <key>Price</key>
                        <string>9.0</string>
                    </dict>
                </array>
            </dict>
            <dict>
                <key>Title</key>
                <string>Mains</string>
            </dict>
            <dict>
                <key>Title</key>
                <string>Dessert</string>
            </dict>
            <dict>
                <key>Title</key>
                <string>Sides</string>
            </dict>
        </array>
        <key>Title</key>
        <string>Eat</string>
    </dict>
    <dict>
        <key>Title</key>
        <string>Drink</string>
        <key>Rows</key>
        <array>
            <dict>
                <key>Title</key>
                <string>Red</string>
            </dict>
        </array>
    </dict>
</array>
</plist>

MenuViewController.h

#import <UIKit/UIKit.h>

@interface MenuViewController : UITableViewController {
    NSArray *tableDataSource;   
    NSString *CurrentTitle;
    NSInteger CurrentLevel;
}
@property (nonatomic, retain) NSArray *tableDataSource;
@property (nonatomic, retain) NSString *CurrentTitle;
@property (nonatomic, readwrite) NSInteger CurrentLevel;
@end

MenuViewController.m

    #import "MenuViewController.h"
    @implementation MenuViewController
    @synthesize tableDataSource;
    @synthesize CurrentLevel, CurrentTitle;
    - (void)viewDidLoad
    {
        [super viewDidLoad];

        if(CurrentLevel == 0) {
            self.tableDataSource = [NSArray arrayWithContentsOfFile: [[NSBundle mainBundle] pathForResource: @"MenuData" ofType: @"plist"]];
            self.navigationItem.title = @"Menu";
        }
        else 
            self.navigationItem.title = CurrentTitle;
    }

    - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
    {
    #warning Potentially incomplete method implementation.
        return [tableDataSource count];
    }
    - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
    {
    #warning Incomplete method implementation.
        return [[[tableDataSource objectAtIndex: section] 
                 objectForKey: @"Rows"] count];
    }
    - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
        return [[tableDataSource objectAtIndex: section] 
                objectForKey: @"Title"];
    }
    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
    {
        static NSString *CellIdentifier = @"Cell";
        UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
        NSDictionary *dictionary = [[[self.tableDataSource objectAtIndex: indexPath.section] objectForKey: @"Rows"] objectAtIndex: indexPath.row];
        if (cell == nil) {
            cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
            cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
        }
        *//The problem is right here, im just stuck on how to access this property correctly
        **cell.textLabel.text = [dictionary objectForKey:@"Title"];***
        // Configure the cell...
        return cell;
    }
    /*
    // Override to support conditional editing of the table view.
    - (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
    {
        // Return NO if you do not want the specified item to be editable.
        return YES;
    }
    */


    /*
    // Override to support conditional rearranging of the table view.
    - (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
    {
        // Return NO if you do not want the item to be re-orderable.
        return YES;
    }
    */
    #pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Navigation logic may go here. Create and push another view controller.
    /*
     <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];
     // ...
     // Pass the selected object to the new view controller.
     [self.navigationController pushViewController:detailViewController animated:YES];
     [detailViewController release];
     */
    NSDictionary *dictionary = [[[self.tableDataSource objectAtIndex: indexPath.section] objectForKey: @"Rows"] objectAtIndex: indexPath.row];
    //Get the children of the present item.
    NSArray *Children = [dictionary objectForKey:@"Children"];
    if([Children count] == 0) {
        MenuDetailViewController *mdvController = [[MenuDetailViewController alloc] initWithNibName:@"MenuDetailView" bundle:[NSBundle mainBundle]];
        [self.navigationController pushViewController:mdvController animated:YES];
        [mdvController release];
    }
    else {
        //Prepare to tableview.
        MenuViewController *mvController = [[MenuViewController alloc] initWithNibName:@"MenuViewController" bundle:[NSBundle mainBundle]];
        //Increment the Current View
        mvController.CurrentLevel += 1;
        //Set the title;
        mvController.CurrentTitle = [dictionary objectForKey:@"Title"];
        //Push the new table view on the stack
        [self.navigationController pushViewController:mvController animated:YES];
        mvController.tableDataSource = Children;
        [mvController release];
    }
}
    @end

Answer 1

可以以

递归方式钻取数据。 对于根视图控制器单元选择方法 您必须将代码修改为

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    if(self.currentLevel=0)
        return [tableDataSource count];
    else
        return 1;//You require only one section in later levels
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if(self.currentLevel=0)
        return [[[tableDataSource objectAtIndex: section] objectForKey: @"Rows"] count];
    else
        return [tableDataSource count];// Number of children
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
    if(self.currentLevel=0)
        return [[tableDataSource objectAtIndex: section] objectForKey: @"Title"];
    else
        return self.title;//Or your custom title
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    NSDictionary *dictionary = nil;
    if(self.currentLevel=0)
        dictionary= [[[self.tableDataSource objectAtIndex: indexPath.section] objectForKey: @"Rows"] objectAtIndex: indexPath.row];
    else 
       dictionary = [self.tableDataSource objectAtIndex: indexPath.row];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }
    cell.textLabel.text = [dictionary objectForKey:@"Title"];
    // Configure the cell...
    return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { 
    if(self.currentLevel=0)
        dictionary= [[[self.tableDataSource objectAtIndex: indexPath.section] objectForKey: @"Rows"] objectAtIndex: indexPath.row];
    else 
       dictionary = [self.tableDataSource objectAtIndex: indexPath.row];
    if([dictionary objectForKey:@"Children"]!=nil){
        //Drill down only if you have child
        //Now drilling down logic
        id Object = [dictionary objectForKey:@"Children"];
        NSString * title = [dictionary objectForKey:@"Title"];
        if([object isKindOfClass:[NSArray class]) {
            NSArray * dataSource = (NSArray *)object;
            MenuViewController * viewController = [[MenuViewController alloc] initWithNibName:@"YourNibName" bundleNameOrNil:nil];
            viewController.title = title;
            viewController.tableDataSource = dataSource;
            viewController.currentLevel = self.currentLevel+1;
            [self.navigationController pushViewController:viewController animated:YES];
            [viewController release];
        } else if([object isKindOfClass:[NSDictionary class]) {
            //Only one child in the form of dictionary
            //Initialize your detail view controller and push to nav stack
            YourDetailViewController * viewController = [[YourDetailViewController alloc] initWithNibName:@"YourNibName" bundleNameOrNil:nil];
            viewController.data = (NSDictionary*)object;//Pass the view data(price etc)
            viewController.currentLevel = self.currentLevel+1;
            [self.navigationController pushViewController:viewController animated:YES];
            [viewController release];
        } else {
            //Error drilling down is not possible
        }
    }
}

希望这能解决你的钻井问题.. :)