有没有更好的方法来编写这个Objective-c代码？

Question

当我改变场景时,此代码会创建一个随机转换.有十一个过渡.因为它们是静态的,我想我不能使用NSClassFromString.我还需要传递场景对象.现在,转换似乎是多余的.有没有办法重写这个以提高效率？

-(void) newScene
{
CCScene *s = [CCScene node];
id child = [sceneCharacter node];
[s addChild:child];
int random = arc4random() % 10;


switch (random)
{
    case 1:
        [[CCDirector sharedDirector] replaceScene:[CCFadeTransition transitionWithDuration:0.5f scene:s]];
        break;

    case 2:
        [[CCDirector sharedDirector] replaceScene:[CCFadeTRTransition transitionWithDuration:0.5f scene:s]];
        break;

    case 3:
        [[CCDirector sharedDirector] replaceScene:[CCJumpZoomTransition transitionWithDuration:0.5f scene:s]];
        break;

    case 4:
        [[CCDirector sharedDirector] replaceScene:[CCMoveInLTransition transitionWithDuration:0.5f scene:s]];
        break;

    case 5:
        [[CCDirector sharedDirector] replaceScene:[CCOrientedTransitionScene transitionWithDuration:0.5f scene:s]];
        break;

    case 6:
        [[CCDirector sharedDirector] replaceScene:[CCPageTurnTransition transitionWithDuration:0.5f scene:s]];
        break;

    case 7:
        [[CCDirector sharedDirector] replaceScene:[CCRotoZoomTransition transitionWithDuration:0.5f scene:s]];
        break;

    case 8:
        [[CCDirector sharedDirector] replaceScene:[CCShrinkGrowTransition transitionWithDuration:0.5f scene:s]];
        break;

    case 9:
        [[CCDirector sharedDirector] replaceScene:[CCSlideInLTransition transitionWithDuration:0.5f scene:s]];
        break;

    case 10:
        [[CCDirector sharedDirector] replaceScene:[CCSplitColsTransition transitionWithDuration:0.5f scene:s]];
        break;

    case 0:
        [[CCDirector sharedDirector] replaceScene:[CCTurnOffTilesTransition transitionWithDuration:0.5f scene:s]];
        break;

    default:
        [[CCDirector sharedDirector] replaceScene:s];
}

}

Answer 1

您可以将所有CC*Transition对象放入一个数组中,并使用随机数来索引该数组:

transition tt = transitions[random];
[[CCDirector sharedDirector] replaceScheme:[tt transitionWithDuration: 0.5f scene:s]];

另外警告,你的随机数只会取0到9之间的值.如上所述,情况10,默认情况下永远不会发生.