编辑数组项内的键 - plist

Question

我有以下列表：

<?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">
<dict>
    <key>Table 1</key>
    <dict>
        <key>subheadingArr</key>
        <array>
            <dict>
                <key>subheadingName</key>
                <string>Item 1 of table 1</string>
                <key>subheadingDetail</key>
                <string>Detail of item 1</string>
            </dict>
            <dict>
                <key>subheadingName</key>
                <string>Item 2 of table 1</string>
                <key>subheadingDetail</key>
                <string>Detail of item 2</string>
            </dict>
        </array>
    </dict>
    <key>Table 2</key>
    <dict>
        <key>subheadingArr</key>
        <array>
            <dict>
                <key>subheadingDetail</key>
                <string>Item 1 of table 2</string>
                <key>subheadingName</key>
                <string>Detail of item 1</string>
            </dict>
            <dict>
                <key>subHeadingDetail</key>
                <string>Item 2 of table 2</string>
                <key>subheadingName</key>
                <string>Detail of item 2</string>
            </dict>
        </array>
    </dict>
</dict>
</plist>

我正在尝试写作和阅读

我已经使用这两种方法尝试为特定的subheadingName 读写subheadingDetail，但它们是错误的/不完整的，无法使其工作。

-(void)updateInfo:(NSString *)info forSubHeadingName:(NSString *)subheadingName {
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"DeviceInformation.plist"];
    NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile:path];

    [data setObject:info forKey:subheadingName];

    [data writeToFile:path atomically:YES];
}

-(NSString *)readInfoForSubHeadingName:(NSString *)subheadingName {
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"DeviceInformation.plist"];
    NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile:path];

    return [data objectForKey:subheadingDetail];
}

尝试搜索答案，但找不到与我的问题类似的任何内容。 提前致谢。

Answer 1

您可以通过递归遍历所有字典和数组来做到这一点。下面是解决问题的示例代码。

    -(void)updateInfo:(NSString *)info forSubHeadingName:(NSString *)subheadingName
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"DeviceInformation.plist"];
    NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile:path];
    [self processAndSetObject:data parent:subheadingName Info:info];
    [data writeToFile:path atomically:YES];
}

-(NSString *)readInfoForSubHeadingName:(NSString *)subheadingName
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"DeviceInformation.plist"];
    NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile:path];

    return [self processParsedObject:data parent:subheadingName];
}

-(void) processAndSetObject:(id)object parent:(NSString*)strKey Info:(NSString *)info
{
    if([object isKindOfClass:[NSDictionary class]])
    {
        if([object objectForKey:@"subheadingName"] != nil)
        {
            if([[object valueForKey:@"subheadingName"] isEqualToString:strKey])
            {
                [object setValue:info forKeyPath:@"subheadingDetail"];
                return;
            }
        }
        for(NSString * key in [object allKeys])
        {
            id child = [object objectForKey:key];
            [self processAndSetObject:child parent:strKey Info:info];
        }
    }
    else if([object isKindOfClass:[NSArray class]])
    {
        for(id child in object)
        {
            [self processAndSetObject:child parent:strKey Info:info];
        }
    }
}

-(NSString *) processParsedObject:(id)object parent:(NSString*)strKey
{
    if([object isKindOfClass:[NSDictionary class]])
    {
        if([object objectForKey:@"subheadingName"] != nil)
        {
            if([[object valueForKey:@"subheadingName"] isEqualToString:strKey])
            {
                return [object valueForKey:@"subheadingDetail"];
            }
        }
        for(NSString * key in [object allKeys])
        {
            id child = [object objectForKey:key];
            NSString *aStrRetVal = [self processParsedObject:child parent:strKey];
            if(aStrRetVal.length > 0)
            {
                return aStrRetVal;
            }
        }
    }
    else if([object isKindOfClass:[NSArray class]])
    {
        for(id child in object)
        {
            NSString *aStrRetVal = [self processParsedObject:child parent:strKey];
            if(aStrRetVal.length > 0)
            {
                return aStrRetVal;
            }
        }
    }

    return @"";
}

Answer 2

您不能在 Dictionary 中编辑单个对象。您将再次必须编写完整的 plist。 为此，您可以做一件事。获取所有 plist 字典。将其保存在字典对象中。然后编辑您不想编辑的细节。然后再次将完整的字典写入 plist 并编辑详细信息。这是实现这一目标的唯一方法。