Question

// AClass.m
// init
enemyBullets = [[NSMutableArray alloc] initWithCapacity:0];
enemy1 = [[Enemy alloc] initWithBullets:enemyBullets];

// At some point
NSMutableArray *bulletsToDelete = [NSMutableArray array];
for(BulletEnemy *thisBullet in enemyBullets)
{
    // If I have to delete
    [bulletsToDelete addObject: thisBullet];
}
[enemyBullets removeObjectsInArray:bulletsToDelete];

//dealloc method
[enemyBullets release];
[enemy1 release];

现在在敌人的某个时间点，我会做以下事情：

// Enemy.m
- (id)initWithBullets:(NSMutableArray*) _bullets{
     // Enemybullets is a var of Enemy
     enemyBullets = _bullets;
}

// At some point...
myBullet = [[BulletEnemy alloc] init];
[enemyBullets addObject:myBullet];
[myBullet release];

问题是当我在Aclass执行以下操作时：

[enemyBullets removeObjectsInArray:bulletsToDelete];

BulletEnemy中的dealloc方法没有被调用，因为保留计数不是0.为什么？但是，如果我释放ACLass（释放enemyBullets），那么我的子弹将被解除分配。

Answer 1

让敌人拥有敌人的阵营。并使用reverseObjectEnumerator

// AClass.m
// init
enemy1 = [[Enemy alloc] init];

// At some point
for(BulletEnemy *thisBullet in enemy1.enemyBullets.reverseObjectEnumerator)
{
    // If I have to delete
    [enemy1.enemyBullets removeObject:thisBullet];
}

//dealloc method
[enemy1 release];

//Enemy.h
@property (retain) NSMutableArray* enemyBullets;


// Enemy.m
@synthesize enemyBullets = _enemyBullets;

- (id)init{
     // Enemybullets is a var of Enemy
     _enemyBullets = [[NSMutableArray alloc] init];
}

// At some point...
myBullet = [[BulletEnemy alloc] init];
[enemyBullets addObject:myBullet];
[myBullet release];

-(void) dealloc{
    [_enemyBullets release];
}

Answer 2

显然，我正在使用retain属性签名，这使得对象+1因此不会解除分配。刚改变了分配并且它有效。

Objective-c数组在删除时不释放对象

2 个答案: