未捕獲異常'NSInvalidArgumentException'

我不知道爲什麼我的程序崩潰。我大致知道它在哪裏崩潰，這就是它。代碼如下，並且應該添加一個清晰的精靈（1 × 480 px）並移除它擊中的敵人（如果有的話）。該代碼是：未捕獲異常'NSInvalidArgumentException'

-(void)gunManAttack:(ccTime)dt { 
    int avalibleSpace = 210; 
    int minY = gunShot.contentSize.height/2; 
    int maxY = avalibleSpace - gunShot.contentSize.height/2; 
    int rangeY = maxY - minY; 
    int actualY = (arc4random() % rangeY) + minY; 

    int aOa; 
    BOOL allowAttackGun = YES; 

    NSMutableArray *enemiesToKill = [[NSMutableArray alloc] init]; 
    gunShot.position = ccp((gunShot.contentSize.width/2), actualY); 
    [self addChild:gunShot]; 

    CGRect gunShotRect = CGRectMake(
           gunShot.position.x - (gunShot.contentSize.width/2), 
           gunShot.position.y - (gunShot.contentSize.height/2), 
           gunShot.contentSize.width, 
           gunShot.contentSize.height 
           ); 

    for (CCSprite *enemy in allEnemies) 
    { 
     CGRect enemyARect = CGRectMake(
      enemy.position.x - (enemy.contentSize.width/2), 
      enemy.position.y - (enemy.contentSize.height/2), 
      enemy.contentSize.width, 
      enemy.contentSize.height 
     ); 

     if (CGRectIntersectsRect(gunShotRect, enemyARect) && allowAttackGun == YES) 
     { 
      [enemiesToKill addObject:enemy]; //Add to enemiesToKill array (clean up array [enemies]) 
      money = money + 100; //Add money for the kill 
      [moneyL setString:[NSString stringWithFormat:@"$ %i", money]]; //Update the money on the screen 
      aOa = 1; //Tell the aOa, the enemy was in the walking array 
      allowAttackGun = NO; //Prevent mutliple enemies from being killed (telling the program the attack has been completed) 
     } 
    } 

    for (CCSprite *enemy in attackingEnemies) 
    { 
     CGRect enemyARect = CGRectMake(
      enemy.position.x - (enemy.contentSize.width/2), 
      enemy.position.y - (enemy.contentSize.height/2), 
      enemy.contentSize.width, 
      enemy.contentSize.height 
     ); 

     if (CGRectIntersectsRect(gunShotRect, enemyARect) && allowAttackGun == YES) 
     { 
      [enemiesToKill addObject:enemy]; //Add to enemiesToKill array (clean up array [enemies]) 
      money = money + 100; //Add money for the kill 
      [moneyL setString:[NSString stringWithFormat:@"$ %i", money]]; //Update the money on the screen 
      aOa = 2; //Tell the aOa, the enemy was in the walking array 
      allowAttackGun = NO; //Prevent mutliple enemies from being killed (telling the program the attack has been completed) 
     } 
    } 

    //Removing enemies from arrays 
    for (CCSprite *enemyType1 in enemiesToKill) { 
     if (aOa==1) { //If the aOa is 1 (aka the enemy is in the walking array) 
      [allEnemies removeObject:enemyType1]; //Remove the enemy from the allEnemies (walking) array 
     } 
     if (aOa==2) { //If the aOa is 2 (aka the enemy is in the attacking array) 
      [attackingEnemies removeObject:enemyType1]; //Remove the enemy from the attackingEnemies (attacking) array 
     } 
     [self removeChild:enemyType1 cleanup:YES]; //Then remove the element from this array (due to the fact it has alredy been removed from the other arrays) 
    } 
    [enemiesToKill release]; 
    [self removeChild:gunShot cleanup:YES]; 
}

調試器輸出這樣的：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString contentSize]: unrecognized selector sent to instance 0x80b7450' ***

我怎樣才能找出它的崩潰？

來源

2011-12-11 user1091516

您是否嘗試使用XCode調試器逐步進行調試？它可能會幫助您找到導致應用程序崩潰的行代碼 – Niko

添加一個異常斷點以指向引發異常的行：http://developer.apple.com/library/mac/#recipes/xcode_help-breakpoint_navigator/articles /adding_an_exception_breakpoint.html –

該例外說明[__NSCFString contentSize]無法識別。所以你在不應該的東西上調用contentSize。在上面的代碼中，您可以在兩個不同的對象上調用它。一個是敵人，另一個是槍射。敵人看起來很好定義爲CCSprite，但我看不到一個槍射擊的定義。它在哪裏被定義？如果它不是這兩個，那麼你可能在這個方法之外有一個bug。 –

這看起來像你缺少一個retain的地方，所以你想使用一個對象被釋放，它的內存重用，並嘗試發送郵件（contentSize）的東西，現在是一個NSString。

這裏最有可能的候選人：gunShot。

你應該嘗試啓用NSZombies，它應該有助於調試。

來源

2011-12-11 10:58:54 jv42

什麼是NSZombies？ – user1091516

http://www.cocoadev.com/index.pl?NSZombieEnabled – jv42

未捕獲異常'NSInvalidArgumentException'

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