Iphone 的定位？

Question

我正在编写以下代码

- (void)viewDidLoad 
{ 
    [super viewDidLoad];
    [self checkOrientation];
}

-(void)viewWillAppear:(BOOL)animated
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receivedRotate:) name:UIDeviceOrientationDidChangeNotification object:nil];
    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

    [super viewWillAppear:animated];
}

-(void)viewWillDisappear:(BOOL)animated
{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];
    [super viewWillDisappear:animated];
}

- (void)receivedRotate:(NSNotification *)notification
{    
    [self checkOrientation];
}  

-(void)checkOrientation
{
    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
    if (orientation == UIDeviceOrientationLandscapeLeft||orientation==UIDeviceOrientationLandscapeRight)
    {
        NSLog(@"Right and Left");
        self.view.frame = CGRectMake(0, 0, 480, 320);
        // Set x coorinate of views you want to change
    }
    else
    {
        NSLog(@"Up or Down");
        // Set x coordinates of views to initial x xoordinates.
    }
}        

这条线

self.view.frame = CGRectMake(0, 0, 480, 320);

不起作用，如果我像

self.view.superview.frame = CGRectMake(-50, -70, 800, 900);

这样写它正在改变轴，但我不知道它的行为方式，

我想改变视图矩形，它的改变会改变方向，我该怎么做？

Answer 1

为什么要使用通知进行轮换。您可以使用其中任何一个

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation; 

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration;

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation;

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration;

- (void)willAnimateFirstHalfOfRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration;

- (void)didAnimateFirstHalfOfRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation; 

- (void)willAnimateSecondHalfOfRotationFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation duration:(NSTimeInterval)duration; 

您可以在 UIVIewController上的参考文档

Answer 2

为什么你要自己做一个函数来检查方向。相反，请使用 UIViewController 本身的函数。

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{    
    if(interfaceOrientation == UIInterfaceOrientationLandscapeLeft || interfaceOrientation == UIInterfaceOrientationLandscapeRight)
    {
        yourLabel.frame = CGRECTMAKE(10,10,50,50); // for landscape
    }
    else 
    {
        yourLabel.frame = CGRECTMAKE(20,20,50,50); // for portrait
    }

    return YES;
}