Question

我需要使用JSON将propertylist已解析的数据存储到objective C，如下面的结构。

我的服务器JSON响应：

{ 
   "response":{ 
      "A":{ 
         "name":"Arun",
         "age":"20",
         "city":"SFO",
         "subject":2
      },
      "B":{ 
         "name":"Benny",
         "age":"20",
         "city":"SFO",
         "subject":1
    },
      "C":{ 
         "name":"Nani",
         "age":"30",
         "city":"SFO",
         "subject":0
      }
   },
   "inprogressdata":{ 
   },
   "dataspeed":"112 milliseconds..."
}

我正在尝试将下面的存储方法转换为propertylist。进入这个属性列表Item 0 , 1, 2它被称为JSON响应A, B, C值为Into Array，Item应该作为一个Dictionary。

NOTE : A, B, C值将根据JSON响应增加，我的意思是它不是静态它可能会达到Z.

在这个Array值中，每个值都应该存储为dictionary。在该字典中需要添加如下所示的字符串值，如果主题计数高于0，则基于该计数它应该创建字典数组，如下图所示。

例如：

-Root 
|
|-----Objects [Array Value]
       |
       |------Item 0(A) [Dictionary Value]   
       |
       |------name (String)
       |------age (String)
       |------city (String)
       |------subject (Number)     // If number 2 then need to create "Objects_Subjectcount" [Array Values]
       |------Objects_Subjectcount (Array)
             |
             |------Item 0 [Dictionary Value]
             |------Item 1 [Dictionary Value]

Answer 1

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"];

// set the variables to the values in the text fields
NSDictionary *plistDict = [NSDictionary dictionaryWithObjects: [NSArray arrayWithObjects: @"pradip", @"25",@"Ahmedabad",@"Computer-Science", nil] forKeys:[NSArray arrayWithObjects: @"Name", @"AGE",@"CITY",@"Subject", nil]];

// create NSData from dictionary
NSString *error = nil;
NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:plistDict format:NSPropertyListXMLFormat_v1_0 errorDescription:&error];

// check is plistData exists

if(plistData) {

    // write plistData to our Data.plist file
    [plistData writeToFile:plistPath atomically:YES];

} else {

    NSLog(@"Error in saveData: %@", error);

}

Answer 2

试试此代码

NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];
NSDictionary *response = JSON[@"response"];
NSArray *objects = [response allValues];
NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = paths.firstObject;
NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"File.plist"];
NSError *writeError = nil;
NSData *plistData = [NSPropertyListSerialization dataWithPropertyList:objects format:NSPropertyListXMLFormat_v1_0 options:NSPropertyListImmutable error:&writeError];
if(plistData){
    [plistData writeToFile:plistPath atomically:YES];
}
else {
    NSLog(@"Error in saveData: %@", error);
}

如果我对你的问题的第二部分的理解是正确的，那么代码将是这样的

NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves | NSJSONReadingMutableContainers error:&error];
 NSDictionary *response = JSON[@"response"];
 NSArray *keys = [response allKeys];

 NSMutableArray *objects = [NSMutableArray new];
 for (NSString *key in keys) {
     NSMutableDictionary *object = response[key];
     NSPredicate *predicate = [NSPredicate predicateWithFormat:@"subject = %@",object[@"subject"]];
     NSArray *objectsWithSameSubject = [objects filteredArrayUsingPredicate:predicate];
     NSInteger subjects = [object[@"subject"] integerValue];
     if (subjects > 0) {

         NSMutableArray *Objects_Subjectcount = [NSMutableArray new];
         [object setObject:Objects_Subjectcount forKey:@"Objects_Subjectcount"];
         for (NSInteger i = 0; i < subjects; i++) {
             [Objects_Subjectcount addObject:object];// object or anything you need

         }
     }
     [objects addObject:object];
 }

 NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
 NSString *documentsPath = paths.firstObject;
 NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"File.plist"];
 NSError *writeError = nil;
 NSDictionary *finalDict = @{@"Objects": objects};
 NSData *plistData = [NSPropertyListSerialization dataWithPropertyList:finalDict format:NSPropertyListXMLFormat_v1_0 options:NSPropertyListImmutable error:&writeError];
 if(plistData){
     [plistData writeToFile:plistPath atomically:YES];
 }
 else {
     NSLog(@"Error in saveData: %@", error);
 }

步骤是，

1. Create JSON with mutable containers and leaves.
2. Iterate through all keys and values.
3. Check whether the subject value of object is greater than 0 in the existing subjects array? if yes add the object to
Objects_Subjectcount. Add the object to objects array.(Don't forget
to set an NSMutable array with key Objects_Subjectcount) to the
object. 4 . Make final dictionary to be written as plist - wrap the
objets array in a dictionary with key "objects"
5. Convert the dictionary to plist data and write it

如何使用Objective C将JSON解析数据存储到Plist中？

2 个答案: