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POCasting in Objective-C does not work as expected
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  1. POCasting in Objective-C does not work as expected
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    copied!<p>I am new to programming with Objective-C and Stackoverflow, and I need some help.</p> <p>I'm trying to get an object from a NSMutableArray and check one of its internal properties. I figured the best way to do this is by doing the following cast:</p> <pre><code>GenericRoom *room = (GenericRoom*)[myRooms objectAtIndex: currentIndex + side]; if (room.myType == EMPTY) { return YES; } </code></pre> <p>The problem is that when I create a class of type GenericRoom, your constructor already defines myType as EMPTY. When I insert the instances in NSMutrableArray, I changed to myType TAVERN this way:</p> <pre><code>NSMutableArray *myRooms = [[NSMutableArray alloc] initWithCapacity:15]; for (int i = 0: i &lt;15: i + +) {     GenericRoom tmpRoom * = [[GenericRoom alloc] initWithType: TAVERN];     myRooms insertObject: tmpRoom atIndex i]; } </code></pre> <p>But when I do the cast that quote up there, it simply creates a new instance of the object GenericRoom, instead of copying the object inside NSMutableArray, making its result is always YES, my failing vereficação.</p> <p>Is there any better way to solve this problem? Thank you all.</p> <p>EDIT: The complete code</p> <p>GenericRoom.h</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #import "cocos2d.h" enum Rooms { EMPTY, TAVERN, WARRIORGUILD, MAGEGUILD }roomsType; @interface GenericRoom : CCLayer { CCSprite *mySprite; enum Rooms myType; } @property (nonatomic, retain) CCSprite *mySprite; @property enum Rooms myType; @property int test; - (id)initWithSprite: (NSString *)file; - (id)initWithType: (enum Rooms)roomType; @end </code></pre> <p>GenericRoom.m</p> <pre><code>#import "GenericRoom.h" @implementation GenericRoom @synthesize mySprite, myType, test; -(id)init { if (self = [super init]) { } return self; } -(id)initWithType: (enum Rooms) roomType { if (self = [super init]) { myType = roomType; } return self; } -(id)initWithSprite: (NSString *)file { if (self = [super init]) { mySprite = [CCSprite spriteWithFile:file]; [self addChild: mySprite]; } return self; } @end </code></pre> <p>RoomManager.h</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #import "cocos2d.h" #import "GenericRoom.h" #import "RoomTavern.h" #import "RoomEmpty.h" enum Sides { LEFT, RIGHT, UP, DOWN }theSides; @interface RoomManager : CCLayer { CGSize size; NSMutableArray *myRooms; } - (void) CreateRoom: (enum Rooms)roomType; @end </code></pre> <p>RoomManager.m</p> <pre><code>@implementation RoomManager -(id)init { if (self = [super init]) { size = [[CCDirector sharedDirector] winSize]; myRooms = [[NSMutableArray alloc] initWithCapacity:15]; for (int i = 0; i &lt; 15; i++) { GenericRoom *tmpRoom = [[GenericRoom alloc] initWithType:TAVERN]; tmpRoom.test = 10; [myRooms insertObject:tmpRoom atIndex:i]; } [self CreateRoom:TAVERN]; } return self; } - (void) CreateRoom: (enum Rooms)roomType { switch (roomType) { case TAVERN: { //Create the Tavern Main Room RoomTavern *tmpRoom = [[RoomTavern alloc] initWithSprite:@"room-hd.png"]; tmpRoom.mySprite.position = ccp(size.width/2,size.height/2); [self addChild:tmpRoom]; [myRooms removeObjectAtIndex:8]; [myRooms insertObject:tmpRoom atIndex:8]; if ([self CheckAdjacentRooms:8 andSide:LEFT]) { RoomEmpty *tmpEmptyRoom = [[RoomEmpty alloc] initWithSprite:@"roomToBuild-hd.png"]; tmpEmptyRoom.mySprite.position = ccp(tmpRoom.mySprite.position.x - tmpRoom.mySprite.contentSize.width, tmpRoom.mySprite.position.y); [self addChild:tmpEmptyRoom]; [myRooms insertObject:tmpEmptyRoom atIndex:7]; } break; } default: break; } } - (BOOL) CheckAdjacentRooms: (int)currentIndex andSide:(enum Sides)side { int leftRightSide = 0; if(side == LEFT) leftRightSide = -1; else if (side == RIGHT) leftRightSide = 1; GenericRoom *roomTmp = (GenericRoom *)[myRooms objectAtIndex:currentIndex + side]; if (roomTmp.myType == EMPTY) { return YES; } else return NO; } @end </code></pre>
 

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