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IOS開發（74）之把 Array 和 Dictionaries 序列化成 JSON 對象

編輯：IOS開發綜合

1 前言
通過 NSJSONSerialization 這個類的 dataWithJSONObject:options:error:方法來實現,Array 和 dictionary 序列化成 JSON 對象。方便在網絡中傳輸。

2 代碼實例
TestDemo.m

[plain]
(void)converseToJson{
    NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
    [dictionary setValue:@"Archy" forKey:@"First Name"];
    [dictionary setValue:@"Robbins" forKey:@"Last Name"];
    [dictionary setValue:[NSNumber numberWithUnsignedInteger:51] forKey:@"Age"];
    NSArray *arrayOfArchysChildren = [[NSArray alloc] initWithObjects:
                                        @"Anthony's Son 1",
                                        @"Anthony's Daughter 1",
                                        @"Anthony's Son 2",
                                        @"Anthony's Son 3",
                                        @"Anthony's Daughter 2", nil];
    [dictionary setValue:arrayOfArchysChildren forKey:@"children"];
    NSError *error = nil;
    //NSJSONWritingPrettyPrinted:指定生成的JSON數據應使用空格旨在使輸出更加可讀。如果這個選項是沒有設置,最緊湊的可能生成JSON表示。
    NSData *jsonData = [NSJSONSerialization
                        dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:&error];
    if ([jsonData length] > 0 && error == nil){
        NSLog(@"Successfully serialized the dictionary into data.");
        //NSData轉換為String
        NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
        NSLog(@"JSON String = %@", jsonString);
    }
    else if ([jsonData length] == 0 &&
             error == nil){
        NSLog(@"No data was returned after serialization.");
    }
    else if (error != nil){
        NSLog(@"An error happened = %@", error);
    }

}

-(void)converseToJson{
    NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
    [dictionary setValue:@"Archy" forKey:@"First Name"];
    [dictionary setValue:@"Robbins" forKey:@"Last Name"];
    [dictionary setValue:[NSNumber numberWithUnsignedInteger:51] forKey:@"Age"];
    NSArray *arrayOfArchysChildren = [[NSArray alloc] initWithObjects:
                                        @"Anthony's Son 1",
                                        @"Anthony's Daughter 1",
                                        @"Anthony's Son 2",
                                        @"Anthony's Son 3",
                                        @"Anthony's Daughter 2", nil];
    [dictionary setValue:arrayOfArchysChildren forKey:@"children"];
    NSError *error = nil;
    //NSJSONWritingPrettyPrinted:指定生成的JSON數據應使用空格旨在使輸出更加可讀。如果這個選項是沒有設置,最緊湊的可能生成JSON表示。
    NSData *jsonData = [NSJSONSerialization
                        dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:&error];
    if ([jsonData length] > 0 && error == nil){
        NSLog(@"Successfully serialized the dictionary into data.");
        //NSData轉換為String
        NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
        NSLog(@"JSON String = %@", jsonString);
    }
    else if ([jsonData length] == 0 &&
             error == nil){
        NSLog(@"No data was returned after serialization.");
    }
    else if (error != nil){
        NSLog(@"An error happened = %@", error);
    }

}
控制台結果