在 obj c 中声明为未使用的标识符，即使它已声明

Question

我遇到了 NSDictionary for 循环的问题。字典被称为“海滩”，但在循环海滩内未声明。这是代码

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{

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


NSArray *results = [jsonString JSONValue];


for (NSDictionary *beach in results);             //beach is flagged as unused
{
  NSString *Name = [beach objectForKey:@"Name"];  //beach is flagged as undeclared
  NSLog(Name);
}

}

任何建议都会很棒。

Answer 1

您的 for 语句中有一个虚假的分号：

for (NSDictionary *beach in results); 
//                                  ^

这使您的代码等效于：

for (NSDictionary *beach in results)
    ;

{
    NSString *Name = [beach objectForKey:@"Name"];
    NSLog(Name);
}