Xcode 4.3.1语法错误

Question

I'm pretty new to coding on Xcode (or objective-c in general) and I can't seem to get rid of these errors:

  //
    //  HelloWorldLayer.m
    //  FirstGame
    //
    //  Created by Kostas on 1/14/12.
    //  Copyright __MyCompanyName__ 2012. All rights reserved.
    //


    // Import the interfaces
    #import "HelloWorldLayer.h"
    #import "GamePlay.h"

    // HelloWorldLayer implementation
    @implementation HelloWorldLayer
    +(id) scene {

        CCScene *scene = [CCScene node];

        HelloWorldLayer *layer = [HelloWorldLayer node];
        // add layer as a child to scene
        [scene addChild: layer];
        // return the scene
        return scene;
    }

    // on "init" you need to initialize your instance

    -(id) init {

        if( (self=[super init] )) {

            [CCMenuItemFont setFontName:@"Marker Felt"];
            [CCMenuItemFont setFontSize:35];
            CCMenuItem *Play = [CCMenuItemFont itemFromString:@"PLAY"
                                target:self
                                selector:@selector(gotoGameplay:)];

            CCMenu *menu = [CCMenu menuWithItems: Play, nil];
            menu.position = ccp(240, 160);
            [menu alignItemsVerticallyWithPadding:10];
            [self addChild:menu];
        }

        return self;
    }

    -(void) goToGameplay: (id) sender {

        [[CCDirector sharedDirector] 
               replaceScene:[[CCTransitionFade 
                    transitionWithDuration:1 
                    scene:[GamePlay node]
                              ]];   **<-----Here is my error it says "Expected identifier"**
    }


    - (void) dealloc {


        [super dealloc];
    }
    @end

The expected identifier is just what X-Code came up with.

Answer 1

If you count your brackets, you'll see that you have two more opening brackets than closing brackets. I've indented them here so you can see the problem clearly.

-(void) goToGameplay: (id) sender {
    [
      [CCDirector sharedDirector] 
      replaceScene:
      [ // <-- either this is extra
        [CCTransitionFade transitionWithDuration:1
                                           scene:[GamePlay node]
        ]
      ];
  //];   <-- or this is missing
}

The compiler is trying to tell you that it wasn't expecting to find a semicolon in the middle of a message send expression. I'm not familiar enough with the Cocos2D framework to know what exactly you're trying to do, but at least you can see what problem is.

Answer 2

This line:

[[CCDirector sharedDirector] 
           replaceScene:[[CCTransitionFade 
                transitionWithDuration:1 
                scene:[GamePlay node]
                          ]];

has 5 open brackets and only 4 close brackets. There needs to be the same number (and in the right places). Most likely you need to get rid of one of the two open brackets after replaceScene: .

BTW - why are you using such and old Xcode? You should use the latest - 4.5.1.

Answer 3

Change

[[CCDirector sharedDirector] 
               replaceScene:[[CCTransitionFade 
                    transitionWithDuration:1 
                    scene:[GamePlay node]
                              ]];

to,

[[CCDirector sharedDirector] replaceScene:
        [CCTransitionFade transitionWithDuration:1
                                           scene:[GamePlay node]]];

That should fix the issue. You had an extra [ before [CCTransitionFade transitionWithDuration:1 scene:[GamePlay node]]