NSDictionary是零

Question

我想解析一個本地JSON，我試圖這樣做，但是testDict是零。任何人都可以幫助我嗎？

- (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是這個樣子：

"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." 
    ], 

和我檢查是一個驗證JSON

Answer 1

我用下面的代碼：

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); 

當我使用您上面提供的Json數據：

"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." 
], 

我得到這個錯誤：

The data couldn’t be read because it isn’t in the correct format." (JSON text did not start with array or object and option to allow fragments not set

原來你JSON是壞的格式。要修復你的Json，請在你的json文件開頭添加{，最後加上}。 您可以通過檢查this site來查看您的JSON格式是否正確。如果您的數據無效，您的NSDIctionary將爲空。

把你的Json以正確的格式後，正確顯示以下數據：

{ 
    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." 
    ); 
}