Question

所以我在几个视图控制器中使用了以下代码来实现一些自定义对象，这些对象是以不同的方式绘制的，具体取决于方向的变化。

出于某种原因，以下两种方法的这种特定实现不起作用：

- (void)awakeFromNib
{
    isShowingLandscapeView = NO;
    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(orientationChanged:)
                                                 name:UIDeviceOrientationDidChangeNotification
                                               object:[UIDevice currentDevice]];
}



- (void)orientationChanged:(NSNotification *)notification
{
    NSLog(@"Are we changing orientations?");
    UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
    if (UIDeviceOrientationIsLandscape(deviceOrientation) &&
        !isShowingLandscapeView)
    {
        isShowingLandscapeView = YES;
        NSLog(@"Landscape!");

        /*

         // Landscape orientation
         [txtLoginID setFrame:CGRectMake(489, 200, 145, 30)];
         [txtPassword setFrame:CGRectMake(489, 235, 145, 30)];
         [loginLabel setFrame:CGRectMake(378, 203, 69, 21)];
         [pwdLabel setFrame:CGRectMake(378, 238, 80, 21)];
         loginButton.frame = CGRectMake(561, 273, 73, 30);

         // Set iPad landscape background
         background.frame = CGRectMake(0, 0, 1024, 748);
         [background setContentMode:UIViewContentModeScaleToFill];
         [background setImage:[UIImage imageNamed:@"ipadLandscape.jpg"]];
         [self.view addSubview:background];
         */
    }
    else if (UIDeviceOrientationIsPortrait(deviceOrientation) &&
             isShowingLandscapeView)
    {
        isShowingLandscapeView = NO;
        NSLog(@"Portrait!");

        /*
         // Portrait orientation
         txtLoginID.frame = CGRectMake(367, 254, 145, 30);
         txtPassword.frame = CGRectMake(367, 289, 145, 30);
         loginLabel.frame = CGRectMake(256, 257, 69, 21);
         pwdLabel.frame = CGRectMake(256, 292, 80, 21);
         loginButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
         loginButton.frame = CGRectMake(439, 327, 73, 30);

         // Set iPad portrait background
         background.frame = CGRectMake(0, 0, 768, 1004);
         [background setContentMode:UIViewContentModeScaleToFill];
         [background setImage:[UIImage imageNamed:@"ipadPortrait.jpg"]];
         [self.view addSubview:background];
         */
    }
}

有关为什么这不起作用的任何想法？我的日志声明似乎没有产生任何结果。

Answer 1

对于延迟，可以尝试使用此方法：

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

Answer 2

我认为您可以通过覆盖didRotateFromInterfaceOrientation:方法直接从视图控制器订阅通知来执行此操作。请参阅Apple文档here。

基于方向改变iOS改变视图

2 个答案: