Question

我收到了以下服务人员的答复:

{"_license":false}

当我试图从<条码>中删除时,即。显示<代码>null。我试图这样做:

NSString *items = [[parser objectWithString:[request responseString] error:nil] valueForKey:@"_license"];
NSLog(@"response server%@", items);

Any idea why?And how to solve?

Answer 1

Try en spilt up their Code, no t do all matters in one行。然后,如果含有正确价值,就会变数。

NSLog(@"Server response: %@",[request responseString]);
NSError * error = nil;

NSDictionary *response = [parser objectWithString:[request responseString] error:&error]

if (!response)( {
  NSLog( @"Error parsing JSON: %@", error);
  return;
}

NSLog(@"Dictionary: %@", response);

NSNumber *hasValidLicense = [response objectForKey:@"_license"];
NSLog(@"Has valid license: %@", hasValidLicense);

if ([hasValidLicense boolValue]){
   //Yes we have a valid license.
} else {
   // No valid license.
}

Answer 2

改为:

BOOL items = [[[parser objectWithString:[request responseString] error:nil] valueForKey:@"_license"] boolValue];

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