重力感应 横竖屏切换

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

 

xcode 4.3.2中为Inital interface orientation  设置为Landscape (right home button)

当然你输入上面的，xcode也会为你纠正，所以两种都可以！

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