得到“ ***由于未捕获的异常'NSInvalidArgumentException'而终止应用程序，原因：'-[__ NSCFNumber compare：]：nil参数'”

Question

Though we have lot of people asked same question , none of the answers are helping to fix my issue. So here is my code ,

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc]initWithRequest:request];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

    NSString *text = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
    NSLog(@"Response: %@", text);



    //The NSJSONSerialization method to transform the NSData responseObject into a dictionnary does work
    NSJSONSerialization *jsonResponse = [NSJSONSerialization JSONObjectWithData:responseObject options:0 error:nil];

    //This NSLog makes the app crash with an unrecognized selector sent error
    NSLog(@"JSON: %@",jsonResponse);

    NSArray *result1=(NSArray *)[jsonResponse valueForKeyPath:@"result"];

    NSLog(@"result1: %@",result1);

    NSMutableString  *shipPrice =[[NSMutableString alloc]init];
    NSMutableString  *freeLimitString =[[NSMutableString alloc]init];

    if(result1!=Nil && ![result1 count]==0)
    {
               for (int i=0; i<result1.count; i++)
               {
                    NSNumber *totalShippingPrice = [[result1  objectAtIndex:i] valueForKeyPath:@"totalShippingPrice"];
                    if( totalShippingPrice != nil && totalShippingPrice && [totalShippingPrice isEqualToNumber:0]&& [totalShippingPrice intValue]==0) // ISSUE LINE
                                {
                                    shipPrice = (NSMutableString*)@"FREE";
                                } } } } 

I kept breakpoint and exactly its happening in this above line. Im new to AFNetworking . Im not sure how to fix it. Help me with working code sample :) Thanks

Answer 1

You need to use this:

[totalShippingPrice isEqualToNumber: [NSNumber numberWithInt:0]]

In the line that crashes. You need to compare the object with another one of the same type, if you use 0 is the same as if you were sending nil to it, so you need to create a NSNumber as I wrote.

Or just do:

[totalShippingPrice intValue] == 0