Orientation - 2

来源：互联网发布：java生成验证码工具类编辑：程序博客网时间：2024/06/10 02:24

先来看看很多的一个总结：http://www.cnblogs.com/tekkaman/p/3679848.html

在项目中遇到一个非常诡异的问题（诡异都是相对的，相对于我没有这块知识的前提下决定诡异哈哈）

就是我的悬浮框再手机“即将转换方向”的时候出现了错位的问题，而这个“即将转换方法”的动作也只是讲手机前倾或者后仰（了解了这块知识之后发现iPhone 的sensor度也太高了吧！）

这段代码的大概：

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleOrientationDidChange:) name:UIDeviceOrientationDidChangeNotification object:nil];#pragma mark - UIDeviceOrientationDidChangeNotification- (void)handleOrientationDidChange:(NSNotification *)notification{    if (self.isYinLian)    {        return;    }        UIWindow *keyWindow = GetKeyWindow;    if (_flowButton.isSelected)    {        if (_flowButton.center.x >= VIEW_W(keyWindow) * 0.5f)        {            LOG(@"a");            CGPoint v = CGPointMake( -(VIEW_W(_flowButton) * 0.5f + VIEW_W(_flowMenu)*0.5f - 13), 0);            LOG(@"%f, %f", _flowButton.center.x, _flowButton.center.y);            LOG(@"%f", keyWindow.bounds.size.width);            _flowMenu.center = cgpAdd(_flowButton.center, v);                        _flowMenu.hidden = NO;        }        else        {            LOG(@"a a");            CGPoint v = CGPointMake( VIEW_W(_flowButton)*0.5f + VIEW_W(_flowMenu)*0.5f - 13, 0);            _flowMenu.center = cgpAdd(_flowButton.center, v);            _flowMenu.hidden = NO;        }    }        if (_isFlowButtonDismiss)    {        if (_flowButton.center.x >= VIEW_W(keyWindow) * 0.5f) {            _flowButton.frame = CGRectMake(_flowButton.superview.bounds.size.width - 10, _flowButton.frame.origin.y, _flowButton.bounds.size.width, _flowButton.bounds.size.height);            LOG(@"b");        }        else        {            _flowButton.frame = CGRectMake(-_flowButton.bounds.size.width + 10, _flowButton.frame.origin.y, _flowButton.bounds.size.width, _flowButton.bounds.size.height);            LOG(@"b b");        }    }}

原来错误就是这里设置的坐标有误！！

我们来看看这方面的API。

@property(nonatomic,readonly,getter=isGeneratingDeviceOrientationNotifications) BOOL generatesDeviceOrientationNotifications __TVOS_PROHIBITED;- (void)beginGeneratingDeviceOrientationNotifications __TVOS_PROHIBITED;      // nestable- (void)endGeneratingDeviceOrientationNotifications __TVOS_PROHIBITED;

UIKIT_EXTERN NSString *const UIDeviceOrientationDidChangeNotification __TVOS_PROHIBITED;

原来是系统的一个关于屏幕方向的通知。

对于iPad这种屏幕方向经常变动的设备，这真是神器啊！

-(void)viewDidLoad{        [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];    [[NSNotificationCenter defaultCenter] addObserver:self                                              selector:@selector(rotateViewInterfaceOrientation)                                                  name:UIDeviceOrientationDidChangeNotification                                               object:nil];}- (void)rotateViewInterfaceOrientation {        UIInterfaceOrientation tmpOri =self.interfaceOrientation;       if (UIDeviceOrientationIsPortrait(tmpOri))    {        //self.view.frame=CGRectMake(0, 0, 1004, 768);    }    else             {        //self.view.frame=CGRectMake(0, 0, 768, 1004);    }}- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation｛      if (UIDeviceOrientationIsPortrait(interfaceOrientation))    {        //self.view.frame=CGRectMake(0, 0, 1004, 768);    }    else             {        //self.view.frame=CGRectMake(0, 0, 768, 1004);    }  return YES;｝

还可以在触发动作里面设置：

UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];if (orientation == UIDeviceOrientationPortrait)     [self doSomething];else     [self doSomethingElse];

至于如果需要关闭通知（某些情况，例如视图控制器消失viewWillDisappear等）系统提供了一个相应的关闭通知的方法：

[[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];

也可以用手动关闭通知的方法：

[[NSNotificationCenter defaultCenter] removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];

参考：

http://blog.csdn.net/daneildemon/article/details/6102296

http://stackoverflow.com/questions/15996646/begingeneratingdeviceorientationnotifications-how-to-work

http://stackoverflow.com/questions/3361166/uideviceorientationdidchangenotification-wont-stop

0 0