2

我有一个 UITableView，它通过以下代码由 plist 中的数组键填充：

-(void)viewWillAppear:(BOOL)animated
{
    // get paths from root direcory
    NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
    // get documents path
    NSString *documentsPath = [paths objectAtIndex:0];
    // get the path to our Data/plist file
    NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"Data.plist"];
    NSMutableDictionary *dictionary = [NSMutableDictionary dictionaryWithContentsOfFile:(NSString *)plistPath];
    viewerKeys = [dictionary allKeys];

    [self.tableView reloadData];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
    {
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"ViewerName"];

        UILabel *label = (UILabel *)[cell viewWithTag:1000];
        label.text = [viewerKeys objectAtIndex:indexPath.row];
        return cell;
}

我正在尝试启用滑动以删除表格视图中的每一行，当然这意味着我必须删除该行以及 plist 中的数组。这是我迄今为止尝试过的：

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
    // get documents path
    NSString *documentsPath = [paths objectAtIndex:0];
    // get the path to our Data/plist file
    NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"Data.plist"];
    NSMutableDictionary *dictionary = [NSMutableDictionary dictionaryWithContentsOfFile:(NSString *)plistPath];

    NSString *key = [viewerKeys objectAtIndex:indexPath.row];
    [dictionary removeObjectForKey:[NSString stringWithFormat:@"%@", key]];


    NSArray *indexPaths = [NSArray arrayWithObject:indexPath];
    [tableView deleteRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationAutomatic];
}

但是它没有将数据写回 plist 并且我收到此错误：

Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (2) must be equal to the number of rows contained in that section before the update (2), plus or minus the number of rows inserted or deleted from that section (0 inserted, 1 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).

这就是我的 plist 的样子：

<plist version="1.0">
<dict>
    <key>(null)</key>
    <array>
        <string>Username</string>
        <string>Password</string>
        <string>http://www.google.com</string>
        <string>/whatever</string>
    </array>
    <key>Hello</key>
    <array>
        <string>admin</string>
        <string></string>
        <string>https://www.whatever.com</string>
        <string>/things</string>
    </array>
</dict>
</plist>

任何帮助都会很棒！

4

1 回答 1

1

您的问题是您仅从字典中删除该对象。您viewerKeys仍然持有已删除的对象键。您需要viewerKeys在调用之前更新deleteRowsAtIndexPaths:

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
 NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
// get documents path
NSString *documentsPath = [paths objectAtIndex:0];
// get the path to our Data/plist file
NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"Data.plist"];
NSMutableDictionary *dictionary = [NSMutableDictionary dictionaryWithContentsOfFile:(NSString *)plistPath];

NSString *key = [viewerKeys objectAtIndex:indexPath.row];
[dictionary removeObjectForKey:[NSString stringWithFormat:@"%@", key]];


 [dictionary writeToFile:plistPath atomically:YES];
 viewerKeys = [dictionary allKeys];

NSArray *indexPaths = [NSArray arrayWithObject:indexPath];
[tableView deleteRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationAutomatic];

}

于 2013-02-15T09:24:40.460 回答