Ios 具有Objective-C开关语句的奇数行为

我有一个使用全局整数

位置

在选项菜单中导航的游戏。当按下每个屏幕上的后退按钮时，它会调用一个函数，

[self options]

，以重新加载原始的“options”屏幕。我有一种感觉，这是我搞砸的一件非常愚蠢的事情

现在，调用确定是否返回按钮的函数的代码如下：

if ([self touchIsInNode:[self childNodeWithName:@"back"] touchPoint:touchPoint]) {
                    // stuff should happen here
                }

使用

touchinnode:

是我自己的自定义方法，用于处理返回

BOOL

值的点击（

YES

，如果是）

为每个屏幕的后退按钮命名

backa

、

backb

、

backc

等是一个可行的解决办法，但无论

位置的值如何，它仍然在每个开关情况下调用代码

以下是我在
开关
语句中的内容：

switch (position) {
            // case 0 thru 3 are unrelated to the question... 0 is for the main menu, 1 is for the original logic for the "options" screen, 2 is for the end of the game, and 3 is to skip to the end of the intro screen.
            case 4:
            {
                NSLog(@"position: %i", position);
                if ([self touchIsInNode:[self childNodeWithName:@"backa"] touchPoint:touchPoint]) {
                    NSLog(@"store back button was pressed and [self options] is being called...");
                    [self options];
                }
                // store UI
            }
            case 5:
            {
                NSLog(@"position: %i", position);
                if ([self touchIsInNode:[self childNodeWithName:@"backb"] touchPoint:touchPoint]) {
                    NSLog(@"stats back button was pressed and [self options] is being called...");
                    [self options];
                }
                // stats UI
            }
            case 6:
            {
                NSLog(@"position: %i", position);
                if ([self touchIsInNode:[self childNodeWithName:@"backc"] touchPoint:touchPoint]) {
                    NSLog(@"about back button was pressed and [self options] is being called...");
                    [self options];
                }
                // about UI
            }
            case 7:
            {
                NSLog(@"position: %i", position);
                if ([self touchIsInNode:[self childNodeWithName:@"backe"] touchPoint:touchPoint]) {
                    NSLog(@"dev options back button was pressed and [self options] is being called...");
                    [self options];
                }
                // dev options UI
            }
            case 8:
            {
                NSLog(@"position: %i", position);
                if ([self touchIsInNode:[self childNodeWithName:@"backd"] touchPoint:touchPoint]) {
                    NSLog(@"purchased options back button was pressed and [self options] is being pressed...");
                    [self options];
                }
                // purchased options UI
            }
            default:
            {
                NSLog(@"INVALID POSITION: %i", position);
                break;
            }
        }
}

我的
options
方法如下所示：

for (SKNode* node in [self children]) {
    // fade out and remove each node if it is not "optionsButton"
    if (![node.name isEqual:@"optionsButton"]) {
        [node runAction:[SKAction fadeAlphaTo:0 duration:1] completion:^{
            [node removeFromParent];
        }];
    } else {
        // if it is "optionsButton", perform an animation.
        [node runAction:[SKAction scaleTo:1.5 duration:1]];
        [node runAction:[SKAction moveTo:CGPointMake(self.size.width / 2, self.size.height - ((node.frame.size.height * (4.0 / 3.0)) / node.yScale)) duration:1] completion:^{
            // afterwards, call a method that logs each node's name.
            [self logEveryNode];
        }];
    }
}
position = 1;
NSLog(@"position: %i", position);

// processing labels

// add in each child

NSLog(@"options called, with %i nodes in [self children]", [self children].count);

// fade in all of the labels

然后，对于选项菜单中的每个子菜单，它们看起来如下所示（使用“存储”菜单作为模型）：

此代码的结果是，即使在
位置
的值更改为
1
表示返回到
选项
菜单后，也会执行每种情况。另外，
didBeginTouches
被奇怪地调用了5次，尽管我在模拟器中只“点击”了一次屏幕。以下是我的日志中更相关的部分：

2015-05-23 01:10:40.581 game[25258:1981445] position: 4
2015-05-23 01:10:40.581 game[25258:1981445] store back button was pressed and [self options] is being called...
2015-05-23 01:10:40.582 game[25258:1981445] position: 1
2015-05-23 01:10:40.588 game[25258:1981445] options called, with 10 nodes in [self children]
2015-05-23 01:10:40.588 game[25258:1981445] position: 1
2015-05-23 01:10:40.588 game[25258:1981445] position: 1
2015-05-23 01:10:40.588 game[25258:1981445] position: 1
2015-05-23 01:10:40.589 game[25258:1981445] position: 1
2015-05-23 01:10:40.589 game[25258:1981445] INVALID POSITION: 1

为什么每个
案例
都会运行，甚至是
默认案例？似乎只有
position==4
应该运行
case4
，而类似
position==500
的东西将运行
默认的
案例。如果有帮助，选项菜单中有5个子菜单。
您需要在每个case块的末尾添加一个break语句。
case语句需要以
break结尾否则，它们将在下一种情况下继续。标准的C行为。我觉得自己像个白痴，因为我没有
break那里。非常感谢。当堆栈溢出允许时，我会接受这个答案。感谢您和Gerd K在评论中发现这一点！
2015-05-23 01:10:40.581 game[25258:1981445] position: 4
2015-05-23 01:10:40.581 game[25258:1981445] store back button was pressed and [self options] is being called...
2015-05-23 01:10:40.582 game[25258:1981445] position: 1
2015-05-23 01:10:40.588 game[25258:1981445] options called, with 10 nodes in [self children]
2015-05-23 01:10:40.588 game[25258:1981445] position: 1
2015-05-23 01:10:40.588 game[25258:1981445] position: 1
2015-05-23 01:10:40.588 game[25258:1981445] position: 1
2015-05-23 01:10:40.589 game[25258:1981445] position: 1
2015-05-23 01:10:40.589 game[25258:1981445] INVALID POSITION: 1