Question

我有TileMap类。它初始化我加载内存中的级别并读取宽度和高度。但是当我用autorelease称这个类时 - ＆gt;程序崩溃

in .h

#import "cocos2d.h"

@interface TileMap : NSObject
{
    CCTMXTiledMap *_tileMap;
    float _width, _height;
}

@property (nonatomic, retain) CCTMXTiledMap *tileMap;
@property (readwrite) float width;
@property (readwrite) float height;

-(void) loadMapWithLVL : (NSString *)lvl;
@end

in .m

#import "TileMap.h"

@implementation TileMap

@synthesize tileMap = _tileMap;
@synthesize width = _width;
@synthesize height = _height;

- (void) dealloc
{
    //[_tileMap release];
    self.tileMap = nil;
    [super dealloc];
}

-(void) loadMapWithLVL: (NSString *)lvl
{
    [self.tileMap release];
    NSString *lvl_new = [NSString stringWithFormat:@"%@.tmx",lvl];

    CCLOG(@"Reload TileMap to %@", lvl_new);
    self.tileMap = [[CCTMXTiledMap tiledMapWithTMXFile:lvl_new] retain];
    self.width = _tileMap.mapSize.width;
    self.height = _tileMap.mapSize.height;    
}

- (id)init
{
    self = [super init];
    if (self) {
        CCLOG(@"Init TileMap");
        self.tileMap = [CCTMXTiledMap tiledMapWithTMXFile:@"1lvl.tmx"];
        self.width = _tileMap.mapSize.width;
        self.height = _tileMap.mapSize.height;
        CCLOG(@"size map in init %0.2f %0.2f", _width, _height);

    }        
    return self;
}    
@end

我写的时候在另一堂课

：

    TileMap *testmap = [[[TileMap alloc] init] autorelease];
    float testg = testmap.width;
    CCLOG(@"size map %0.2f", testg);

我崩溃了。但是当我写道：

TileMap *testmap = [[TileMap alloc] init];
float testg = testmap.width;
CCLOG(@"size map %0.2f", testg);
[testmap release]

我没有崩溃。为什么会这样？

Answer 1

您的代码中存在多个错误。首先，您将属性声明为“保留” - @property (nonatomic, retain) CCTMXTiledMap *tileMap;并将其“合成”。这意味着现在您可以使用此属性进行操作，而无需任何release / retain关键字。所以重写方法loadMapWithLVL是这样的：

-(void) loadMapWithLVL: (NSString *)lvl{
    NSString *lvl_new = [NSString stringWithFormat:@"%@.tmx",lvl];

    CCLOG(@"Reload TileMap to %@", lvl_new);
    self.tileMap = [CCTMXTiledMap tiledMapWithTMXFile:lvl_new];
    self.width = _tileMap.mapSize.width;
    self.height = _tileMap.mapSize.height;    
}

还有一件事 - 清理属性时，不要在self.方法中调用dealloc。 [_tileMap release];, _titleMap = nil;是清理记忆的正确方法。

在自动释放中崩溃（cocos2d）

1 个答案: