Question

我有一系列词典，它保存在app的文档目录中如何更新特定键和索引的值？例如：我想更新第二个词典人名

<?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>personName</key>
            <string>John Sculey</string>
            <key>isPersonAdult</key>
            <true/>
            <key>personID</key>
            <integer>12541</integer>
            <key>personPicture</key>
            <string>john.jpg</string>
            <key>personDesignation</key>
            <string>Branding Manager</string>
            <key>personDepartment</key>
            <integer>2</integer>
            <key>personEmail</key>
            <string>john@johnsculey.com</string>
    </dict>
    <dict>
           <key>personName</key>
            <string>Chris Seattle</string>
            <key>isPersonAdult</key>
            <true/>
            <key>personID</key>
            <integer>89854</integer>
            <key>personPicture</key>
            <string>chris.jpg</string>
            <key>personDesignation</key>
            <string>Branding Manager</string>
            <key>personDepartment</key>
            <integer>2</integer>
            <key>personEmail</key>
            <string>chris@johnsculey.com</string>
    </dict>

依旧......

Answer 1

所以，假设你的字典是可变的，

[[array objectAtIndex:1] setObject:@"New Name" forKey:@"personName"];

（如果不是，请在之前创建一个可变副本。）

Answer 2

不确定，如果我的问题是正确的。但是如果你问，如何在数组的特定索引处访问字典，这将是这样的：

NSMutableDictionary *person = [NSMutableDictionary dictionaryWithDictionary:[array objectAtIndex:1]];
[person setValue:@"Chris Washington" forKey:@"personName"];

没关系，数组包含什么样的对象;它可以是数字或 - 在您的情况下 - 字典对象。您可以正常访问它们。

Answer 3

我的2美分：D

id data = [NSData dataWithContentsOfFile:plistFile];
NSArray *plist = [NSPropertyListSerialization propertyListWithData:data options:NSPropertyListMutableContainersAndLeaves format:nil error:nil];
assert([plist isKindOfClass:[NSArray class]]);

//every element in the array is mutable
NSMutableDictionary *dict = plist[1];
dict[@"key"] = @"value";

Answer 4

您可以使用几行代码执行所需操作...首先，您从阵列中获取要编辑的词典，然后更改密钥的值。我没有测试过这段代码，但它应该运行良好！

NSURL *documents = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
NSURL *plistUrl = [documents URLByAppendingPathComponent:@"yourPlistName.plist"];
NSArray *plistContents = [NSArray arrayWithContentsOfURL:plistUrl];
NSMutableDictionary *personToEdit = [plistContents objectAtIndex:1];
[personToEdit setValue:@"value you want to set" forKey:@"your key"];

字典数组/如何更新特定键和索引的值？

4 个答案: