ios - NSDictionary 为零

Question

我想解析一个本地 json，我正试图这样做，但是 testDict 是 nil。谁能帮帮我吗？

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
    [self.searchResult removeAllObjects];
        NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"SELF contains[c] %@", searchText];
    NSString * firstLetter = [searchText substringWithRange:[searchText rangeOfComposedCharacterSequenceAtIndex:0]];

    NSError *err = nil;
    NSString *aux=@"english_";
    NSString *updated = [aux stringByAppendingString:firstLetter];

    NSString *dataPath = [[NSBundle mainBundle] pathForResource:updated ofType:@"json"];

    testDict = [NSJSONSerialization JSONObjectWithData:[NSData dataWithContentsOfFile:dataPath] options:kNilOptions error:&err];

Json 看起来像这样:

"Caaba": "(n.) The small and nearly cubical stone building, toward which all Mohammedans must pray.",
   "Caas": "(n. sing. & pl.) Case.",
   "Cab": [
      "(n.) A kind of close carriage with two or four wheels, usually a public vehicle.",
      "(n.) The covered part of a locomotive, in which the engineer has his station.",
      "(n.) A Hebrew dry measure, containing a little over two (2.37) pints."
   ],

我正在检查是否是一个验证 json

Answer 1

我使用了以下代码:

NSString *path = @"/Users/JohnApple/Desktop/myJsonFileForThisTest.json";
NSError *err;
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:[NSData dataWithContentsOfFile:path] options:kNilOptions error:&err];
NSLog(@"Here is the NSDicitonary if this worked --> %@",dict);
NSLog(@"Here is the NSError if it failed --> %@", err);

当我使用你上面提供的Json数据时:

"Caaba": "(n.) The small and nearly cubical stone building, toward which all Mohammedans must pray.",
"Caas": "(n. sing. & pl.) Case.",
"Cab": [
  "(n.) A kind of close carriage with two or four wheels, usually a public vehicle.",
  "(n.) The covered part of a locomotive, in which the engineer has his station.",
  "(n.) A Hebrew dry measure, containing a little over two (2.37) pints."
],

我遇到了这个错误:

无法读取数据，因为它的格式不正确。”(JSON 文本未以数组或对象开头，并且未设置允许片段的选项

事实证明您的 JSON 格式不正确。要修复您的 Json，请在文件中的 json 开头添加一个 {，并在最后添加一个 }。您可以通过检查 this site 来检查您的 JSON 格式是否正确。 .如果您的数据无效，您的 NSDIctionary 将为空。

将您的 Json 设置为正确的格式后，将正确显示以下数据:

{
    Caaba = "(n.) The small and nearly cubical stone building, toward which all Mohammedans must pray.";
    Caas = "(n. sing. & pl.) Case.";
    Cab =     (
        "(n.) A kind of close carriage with two or four wheels, usually a public vehicle.",
        "(n.) The covered part of a locomotive, in which the engineer has his station.",
        "(n.) A Hebrew dry measure, containing a little over two (2.37) pints."
    );
}