如果没有互联网，防止应用崩溃

Question

My app is crashing when there is no internet. This is because

NSDictionary *result = [NSJSONSerialization JSONObjectWithData:jsonData
                                                               options:NSJSONReadingMutableContainers error:&error];

returns the error 'data parameter is nil' .

How can I prevent this from crashing as I am caching the jsonData using SDWebImage . So it should still be there even if there is no internet!

Answer 1

You can make sure that the code is executed just if the data is not nil:

if (jsonData) {
    NSDictionary *result = [NSJSONSerialization JSONObjectWithData:jsonData
                                                               options:NSJSONReadingMutableContainers error:&error];
}

Answer 2

not handle only nil , and not proper format of json too and you can get the error msg for further

  @try {

        responseDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
    }
    @catch (NSException *exception) {
        NSLog(@"exception %@",exception);
    }