iphone一些知识，去掉StatusBar,横屏，重力感应,自动切换横竖，开机画面横屏，开机画面横屏。

1，去掉StatusBar

在info.plist添加UIStatusBarHidden设置Boolean，设置为YES.

2，横屏

继续在info.list中添加UIInterfaceOrientation 设置UIInterfaceOrientationLandscapeRight

3，重力感应

AppDelegate继承UIAccelerometerDelegate协议，并实现

// Implement this method to get the lastest data from the accelerometer 

- (void)accelerometer:(UIAccelerometer*)accelerometer didAccelerate:(UIAcceleration*)acceleration {

//Use a basic low-pass filter to only keep the gravity in the accelerometer values{}

在

- (void)applicationDidFinishLaunching:(UIApplication *)application {

}

添加

//Configure and start accelerometer

 [[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1.0 / kAccelerometerFrequency)];

 [[UIAccelerometer sharedAccelerometer] setDelegate:self];

就可以实现重力感应

4,自动切换横竖。

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation  //支持横 竖转动
{
    
    return YES;
}
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration //当发生旋转 时
{
          f(self.interfaceOrientation==UIInterfaceOrientationPortrait||self.interfaceOrientation==UIDeviceOrientationPortraitUpsideDown)
        {
                            //横 转向 竖
         }
}
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation   //旋转 完成
{       　　　　　　　　                 if(self.interfaceOrientation==UIInterfaceOrientationPortrait||self.interfaceOrientation==UIDeviceOrientationPortraitUpsideDown)
        {
                         //当前是在竖屏模式
         }
}

横屏之间切换

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation  //支持横 竖转动

{

    if (interfaceOrientation == UIInterfaceOrientationLandscapeRight ) 

{

return YES;

} 

else if (interfaceOrientation ==  UIInterfaceOrientationLandscapeLeft) 

{

return YES;

}

return NO;

}

/////////////////////////////////////////////////////////////

以下未经过测试

使用重力感应，判断手机的方向，然后设定[UIApplication sharedApplication].statusBarOrientation = UIInterfaceOrientationLandscapeRight,以及UIInterfaceOrientationPortrait,就可以做到根据不同的手机方向弹出横屏还是竖屏的对话框了，包括对话框上包含输入框的键盘也可以自动旋转了

/////////////////////////////////////////////////////////////

5，开机画面横屏

Default-LandscapeLeft.png
Default-LandscapeRight.png
Default-Portrait.png
Default-PortraitUpsideDown.png