Question

我认为这可能是一个愚蠢的错误，但我无法弄明白。任何人都可以告诉我，我错过了什么？

-(void) receiveRecommendData {
 //receive data//
 NSURL *getResultUrl = [NSURL URLWithString:@"http://phdprototype.tk/getResultData.php"];

 NSData *data = [NSData dataWithContentsOfURL:getResultUrl];

 [self getData:data];

 NSDictionary *jsonToDict = json[0]; //[json objectAtIndex:0];

 int pageNumber = [[jsonToDict objectForKey:@"recommendData"]intValue];

 switch (pageNumber) {
     case 0:
         UIViewController *controller = [self.storyboard instantiateViewControllerWithIdentifier:@"Collection_01ViewController"];
         break;
     case 1:
         UIViewController *controller = [self.storyboard instantiateViewControllerWithIdentifier:@"Collection_01ViewController"];
         break;
     case 2:
          UIViewController *controller = [self.storyboard instantiateViewControllerWithIdentifier:@"Collection_02ViewController"];
          break;
     case 3:
          UIViewController *controller = [self.storyboard instantiateViewControllerWithIdentifier:@"Collection_03ViewController"];
         break;
     default:
         break;
 }
}

错误发生在

的代码上

UIViewController *controller = [self.storyboard instantiateViewControllerWithIdentifier:@"Collection_01ViewController"];

Answer 1

您不能将变量声明为案例部分的第一行。只需添加大括号......

switch (pageNumber) {
  case 0: {
     UIViewController *controller = [self.storyboard instantiateViewControllerWithIdentifier:@"Collection_01ViewController"];
     break;
  }
  case 1: {
     UIViewController *controller = [self.storyboard instantiateViewControllerWithIdentifier:@"Collection_01ViewController"];
     break;
  }
  case 2:  //etc

错误maddage：预期的表达？

1 个答案: