iOS 6 - 如何在方向改变时运行自定义代码

问题描述

我正在创建一个游戏，它允许设备处于横向左或横向右方向，并且玩家可以在暂停时更改方向.当他们这样做时，我需要更改游戏根据方向解释加速度计的方式.

I'm creating a game that allows the device to be in either landscape-left or landscape-right orientation, and the player can change the orientation while it's paused. When they do I need to change the way the game interprets the accelerometer based on the orientation.

在 iOS 5 中，我使用 willRotateToInterfaceOrientation 来捕获更改并更改我的变量，但在 iOS6 中已弃用.我现有的代码如下所示:

In iOS 5 I used the willRotateToInterfaceOrientation to catch changes and change my variables, but that's deprecated in iOS6. My existing code looks like this:

    if(toInterfaceOrientation == UIInterfaceOrientationPortrait || toInterfaceOrientation == UIInterfaceOrientationPortraitUpsideDown)      
        rect = screenRect;

    else if(toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft || toInterfaceOrientation == UIInterfaceOrientationLandscapeRight){
        rect.size = CGSizeMake( screenRect.size.height, screenRect.size.width );
    GameEngine *engine = [GameEngine sharedEngine];
    if(toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft){
        engine.orientation = -1;
    } else {
        engine.orientation = 1;
    }
}

我知道替换的是 UIViewController 类中的 viewWillLayoutSubviews 方法.我正在 cocos2d 2.1 中构建这个游戏，并且在演示项目中似乎没有 UIViewController 类，所以我不清楚如何合并它以及代码应该如何看起来才能使其工作.

I understand that the replacement is the viewWillLayoutSubviews method in the UIViewController class. I'm building this game in cocos2d 2.1 and there doesn't appear to be a UIViewController class in the demo project, so I'm not clear on how to incorporate it and how the code should look in order to make this work.

推荐答案

监听设备方向变化:

[[NSNotificationCenter defaultCenter] 
       addObserver:self
          selector:@selector(deviceOrientationDidChangeNotification:) 
              name:UIDeviceOrientationDidChangeNotification 
            object:nil];

收到通知后，从 UIDevice 获取设备方向:

When notified, get the device orientation from UIDevice:

- (void)deviceOrientationDidChangeNotification:(NSNotification*)note
{
    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
    switch (orientation)
    {
        // etc... 
    }
}

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