Question

目前我正在尝试通过查看CCSprite是否越过屏幕的顶部或底部来检查屏幕边界。问题是，我真的想将下面的2个if语句合并到 1 语句中。无论如何，我将要做的唯一困难是以下。我在下面做的是向内移动CCSprite 1点以强制实际的屏幕边界。但我只是不知道如何使用if语句来做到这一点。

无论如何这里是方法：

- (void)checkScreenBoundaries {
    CGSize size = [[CCDirector sharedDirector] winSize];
    if (sprite.position.y <= 0) {
        sprite.position = ccp(sprite.position.x, 1);
        died = YES;
    } else if (sprite.position.y >= size.height) {
        sprite.position = ccp(sprite.position.x, size.height - 1);
        died = YES;
    }
}

任何人都可以告诉我如何将这两者合并为1吗？

谢谢！

Answer 1

if ((sprite.position.y <= 0) || (sprite.position.y >= size.height)) {
    sprite.position = ccp(sprite.position.x, (sprite.position.y <= 0) ? 1 : (size.height - 1));
    died = YES;
}

Answer 2

CGFloat yNew = MAX(1, MIN(sprite.position.y, size.height - 1));
if (yNew != sprite.position.y) {
    sprite.position = ccp(sprite.position.x, yNew);
    died = YES;
}

减少重复的Cocos2D代码？

2 个答案: