如何将新Key添加到嵌套plist

Question

我的应用程序中有自定义plist，我想在嵌套级别添加新密钥。

我该如何添加它？以编程方式？

这是我的plist文件的结构： ： 怎么做到这一点？

请提前帮助和致谢。

Answer 1

您无法编辑App-Bundle中的文件。您必须将其作为NSMutableDictionary阅读，更改并将其保存到您的文档文件夹。

/*--- get bundle file      ---*/
NSString *path = [[NSBundle mainBundle] pathForResource:@"Products" ofType:@"plist"];
NSMutableDictionary *rootDict = [[NSMutableDictionary alloc] initWithContentsOfFile:path];

/*--- set value with key   ---*/
[rootDict setValue:@"NewKeyContent" forKeyPath:@"Mobiles.Brands.TheNewKey"];

/*--- get documents path   ---*/
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,     NSUserDomainMask, YES) lastObject];
NSString *writablePath = [documentsDirectory stringByAppendingPathComponent:@"Products.plist"];

/*--- save file            ---*/
[rootDict writeToFile:writablePath atomically: YES];

之后你将不得不从Documents目录中打开它，否则你将始终以干净的石板开始。

/*--- get documents file   ---*/
NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,     NSUserDomainMask, YES) lastObject];
NSString *path = [docPath stringByAppendingPathComponent:@"Products.plist"];
NSMutableDictionary *rootDict = [[NSMutableDictionary alloc] initWithContentsOfFile:path];

/*--- set value with key   ---*/
[rootDict setValue:@"NewKeyContent" forKeyPath:@"Mobiles.Brands.TheNewKey"];

/*--- get bundle file      ---*/
[rootDict writeToFile:writablePath atomically: YES];

Answer 2

使用NSMutableDictionary +（id / * NSDictionary * * /）dictionaryWithContentsOfFile：（NSString *）路径来创建字典。并使用 [字典setValue：@“new_value”forKeyPath：@“Mobiles.Brands.new_key”];

Answer 3

正如其他人所说，你应该通过点击＆＃34; +＆＃34;在plist编辑器中添加新密钥。按钮。

如果你想用代码编辑你的plist，它会复杂得多。

plist文件被读入内存，其所有对象都是不可变的。您需要创建整个分支的可变副本，直到您要添加的对象。像这样：

//Make a mutable copy of the outermost dictionary
NSMutableDictionary *outer = [startingOuterDict mutableCopy];

//Create a mutable copy of the dictionary at key "Mobiles" and replace it in "outer"
NSMutableDictionary *mobiles =  [outer[@"Mobiles"] mutableCopy];
outer[@"Mobiles"] = mobiles;

//Create a mutable copy of the dictionary at key "Brands" and replace it in "mobiles"
NSMutableDictionary *brands =  [mobiles[@"Brands"] mutableCopy];
mobiles[@"Brands"] = brands;

//Finally, add a new key in the "Brands" dictionary
brands[@"newKey"] = @"Apple";

写一个＆＃34; mutableDeepCopy＆＃34;虽然很棘手但是很有可能。将字典，数组和集合的对象图中的所有容器转换为其可变等效项的方法。但是，在这种情况下你并不需要这样做。