iOS伪亮度调节/控制

iOS并没有开放控制系统亮度的接口，所以app能做到的只是比系统设置的亮度更暗，具体做法就是在整个app的keywindow之上再放一个window，设置黑色背景，通过控制alpha值来达到明暗变化。

[cpp]
- (void)installBrightnessWindow 
{ 
    m_brightnessWindow = [[UIWindow alloc] initWithFrame:self.view.window.frame]; 
    m_brightnessWindow.windowLevel = UIWindowLevelStatusBar + 1; 
    m_brightnessWindow.userInteractionEnabled = NO; 
    m_brightnessWindow.backgroundColor = [UIColor blackColor]; 
    m_brightnessWindow.alpha = 0; 
    m_brightnessWindow.hidden = NO; 
} 

- (void)installBrightnessWindow
{
    m_brightnessWindow = [[UIWindow alloc] initWithFrame:self.view.window.frame];
    m_brightnessWindow.windowLevel = UIWindowLevelStatusBar + 1;
    m_brightnessWindow.userInteractionEnabled = NO;
    m_brightnessWindow.backgroundColor = [UIColor blackColor];
    m_brightnessWindow.alpha = 0;
    m_brightnessWindow.hidden = NO;
}

补充：移动开发 , IOS ,

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