字典转json

1.字典转json

-(NSString*)dictionaryToJson:(NSDictionary *)dic
{
    NSError *parseError = nil;

    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:&parseError];

    return [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
}

2. 将NSArray 转换为JSON字符串传给后台

NSArray *trayCodes = @[@"",@""];
NSError *error = nil;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:trayCodes
                                                       options:kNilOptions
                                                         error:&error];

NSString *jsonString = [[NSString alloc] initWithData:jsonData
                                                 encoding:NSUTF8StringEncoding];

3. 将NSArray 用分割符分割为字符串

NSArray *trayCodes = @[@"",@""];
NSString *jsonStr = [trayCodes componentsJoinedByString:@","];