iphone一些常识,去掉StatusBar,横屏,重力感应,主动切换反正,开机画面横屏,开机画面横屏。

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http://www.cnblogs.com/APTX4869/archive/2011/02/24/1963527.html 
1,去掉StatusBar 

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

2,横屏 

持续在info.list中添加UIInterfaceOrientation 设置UIInterfaceOrientationLandscapeRight 

3,重力感应 

AppDelegate持续UIAccelerometerDelegate和谈,并实现 

// Implement this method to get the lastest data 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,主动切换反正。 

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation //支撑横 竖迁移转变 


return YES; 

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration //当产生扭转 时 

f(self.interfaceOrientation==UIInterfaceOrientationPortrait||self.interfaceOrientation==UIDeviceOrientationPortraitUpsideDown)

//横 转向 竖 


- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)InterfaceOrientation //扭转 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 //支撑横 竖迁移转变 



if (interfaceOrientation == UIInterfaceOrientationLandscapeRight ) 



return YES; 



else if (interfaceOrientation == UIInterfaceOrientationLandscapeLeft) 



return YES; 



return NO; 



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以下未经过测试 

应用重力感应,断定手机的标的目标,然后设定[UIApplication sharedApplication].statusBarOrientation = UIInterfaceOrientationLandscapeRight,以及UIInterfaceOrientationPortrait,就可以做到按照不合的手机标的目标弹出横屏还是竖屏的对话框了,包含对话框上包含输入框的键盘也可以主动扭转了 

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5,开机画面横屏 

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