Objective c NSInvalidArgumentException[NSDictionary initWithObjects:forKeys:]:对象计数(0)与键计数(1)不同
获取错误Objective c NSInvalidArgumentException[NSDictionary initWithObjects:forKeys:]:对象计数(0)与键计数(1)不同,objective-c,nsdictionary,Objective C,Nsdictionary,获取错误NSInvalidArgumentException[NSDictionary initWithObjects:forKeys:]:对象计数(0)不同于键计数(1)。我使用以下代码 NSString *errorDesc = nil; SBJsonParser *parser = [[SBJsonParser alloc] init]; NSDictionary *jsonDictionary = [parser objectWithString:responseData]; pat
NSInvalidArgumentException[NSDictionary initWithObjects:forKeys:]:对象计数(0)不同于键计数(1)
。我使用以下代码
NSString *errorDesc = nil;
SBJsonParser *parser = [[SBJsonParser alloc] init];
NSDictionary *jsonDictionary = [parser objectWithString:responseData];
paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
documentsPath = [paths objectAtIndex:0];
plistPath = [documentsPath stringByAppendingPathComponent:@"json_keys.plist"];
NSDictionary *plistDict = [NSDictionary dictionaryWithObjects: [NSArray arrayWithObjects:jsonDictionary, nil] forKeys:[NSArray arrayWithObjects: @"json_keys", nil]];
NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:plistDict format:NSPropertyListXMLFormat_v1_0 errorDescription:&errorDesc];
if (plistData)
{
[plistData writeToFile:plistPath atomically:YES];
}
else
{
NSLog(@"Error in saveData: %@", errorDesc);
[errorDesc release];
}
从错误消息判断,在本例中,
[parser objectWithString:responseData]
返回nil
。因此,[NSArray array with objects:jsonDictionary,nil]
创建空数组。之后,您将尝试创建NSDictionary
,将空数组作为值传递,将带有@“json_键”的数组作为键传递。所以,在这种情况下,错误消息非常准确
这种情况的解决取决于您试图实现的目标
当jsonDictionary
为nil
时,您可以简单地从方法返回,不做任何事情:
// ...
NSDictionary *jsonDictionary = [parser objectWithString:responseData];
if (nil == jsonDictionary) {
return;
}
paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
// ...
另一种可能是在这种情况下存储空的plistDict
:
NSMutableDictionary *plistDict = [NSMutableDictionary dictionaryWithCapacity:1];
if (nil != jsonDictionary) {
[plistDict setObject:jsonDictionary forKey:@"json_keys"];
}
当然,您还可以找出[parser objectWithString:responseData]
返回nil
的原因,并解决这个问题。是否[parser objectWithString:responseData]
返回NSDictionary?如果没有,那么就投吧。