我有一本字典array
:
{
"encoding": "320",
"format": "MP3",
"media": "CD",
"name": "foo",
"remaster_title": ""
},
{
"encoding": "V0 (VBR)",
"format": "MP3",
"media": "CD",
"name": "bar",
"remaster_title": ""
},
{
"encoding": "Lossless",
"format": "FLAC",
"media": "CD",
"name": "bar",
"remaster_title": "hoho"
}
我想将它们分开,以便它们唯一。例如,应该只有一个,name
所以会有两个部分:foo
和bar
。
然后在每个name
(foo
或bar
)中应该有remaster_title
(for foo
:以及
bar
both:和
hoho
)...。
顺序应为:name > remaster_title > media > format > encoding
。
我认为如果我可以使用类似以下格式的文件,则可以使用:
music[name][remaster_title][media][format] = encoding
这样所有的键都可以合并吗?
我努力了:
+(NSMutableDictionary*)handleReturnedArtistJson:(NSDictionary*)json{
NSMutableDictionary *music = [[NSMutableDictionary alloc] init];
for(NSDictionary *result in json[@"response"][@"group"]) {
NSString* release_type = result[@"releaseType"];
NSString* name = result[@"groupName"];
if (![release_type isEqual: @"Compilation"]){
for (NSDictionary *subgroup in result[@"subgroup"]){
NSString* media = subgroup[@"media"];
NSString* remaster_title = subgroup[@"remasterTitle"];
NSString* format = subgroup[@"format"];
NSString* encoding = subgroup[@"encoding"];
music[name][remaster_title][media][format] = encoding;
}
}
}
return music;
}
但NSLog(@"%@",music);
什么也没返回。
评论区域太小,无法提出一些问题,但让我们假设一些事情。您想将JSON解析为对象树。让我们看看这段代码是否可以帮助您。
#import <Foundation/Foundation.h>
typedef NSMutableDictionary<NSString*, NSString*> formatDictionary;
typedef NSMutableDictionary<NSString*, formatDictionary*> mediaDictionary;
typedef NSMutableDictionary<NSString*, mediaDictionary*> titleDictionary;
typedef NSMutableDictionary<NSString*, titleDictionary*> nameDictionary;
@interface DataSource : NSObject
- (nameDictionary*)parseJSONFile:(NSString *)jsonFile error:(NSError *__autoreleasing *)outError;
@end
实作
@implementation DataSource
- (NSString *)valueOrDefaultFromDictionary:(NSDictionary *) dictionary forKey: (NSString *) key
{
NSString * value = dictionary[key];
if (![value length]) {
return @"";
}
return value;
}
- (NSArray *)jsonToArray:(NSString *)jsonFile error:(NSError *__autoreleasing *)outError
{
NSString *path = [[NSBundle mainBundle] pathForResource:jsonFile ofType:@"json"];
NSString *jsonString = [[NSString alloc] initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
NSError *jsonError;
NSArray *jsonDataArray = [NSArray new];
jsonDataArray = [NSJSONSerialization JSONObjectWithData:[jsonString dataUsingEncoding:NSUTF8StringEncoding] options:kNilOptions error:&jsonError];
if (jsonDataArray == nil) {
if (outError) {
*outError = [NSError errorWithDomain:@"yourdomain" code:-42 userInfo:@{NSUnderlyingErrorKey: jsonError}];
}
return nil;
}
return jsonDataArray;
}
- (nameDictionary*)parseJSONFile:(NSString *)jsonFile error:(NSError *__autoreleasing *)outError
{
NSArray * jsonDataArray = [self jsonToArray:jsonFile error:outError];
if (!jsonDataArray) {
return nil;
}
nameDictionary* music = [nameDictionary new];
[jsonDataArray enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
NSString * name = [self valueOrDefaultFromDictionary:obj forKey:@"name"];
NSString * title = [self valueOrDefaultFromDictionary:obj forKey:@"remaster_title"];
NSString * media = [self valueOrDefaultFromDictionary:obj forKey:@"media"];
NSString * format = [self valueOrDefaultFromDictionary:obj forKey:@"format"];
NSString * encoding = [self valueOrDefaultFromDictionary:obj forKey:@"encoding"];
music[name] = [@{title: [@{media: [@{format:encoding} mutableCopy] } mutableCopy] } mutableCopy];
}];
return music;
}
@end
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