无法在 iPhone 上检测纵向方向

Question

当我旋转横向时，我正在显示一个模态视图控制器。我想在纵向时删除模态视图控制器。出于某种原因，当我进入纵向模式时，我的日志语句没有出现。

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations.
    return (interfaceOrientation == UIInterfaceOrientationPortrait ||
                   interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown ||
                   interfaceOrientation == UIInterfaceOrientationLandscapeLeft ||
                   interfaceOrientation == UIInterfaceOrientationLandscapeRight);
}


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

    if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft ||
        toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) {

        NSLog(@"showing chart");
        [self presentModalViewController:landscapeChartViewController animated:NO];
    }

    if (toInterfaceOrientation == UIInterfaceOrientationPortrait ||
        toInterfaceOrientation == UIInterfaceOrientationPortraitUpsideDown) {
        NSLog(@"dismissing chart");
        [self.parentViewController dismissModalViewControllerAnimated:NO];
    }
}

Answer 1

您可以稍微简化此代码，可能有助于缩小范围。

 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations.
return YES; // Return YES is the same as entering all interfaces.
}


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

if (UIInterfaceOrientationIsLandscape(toInterfaceOrientation)) {

    NSLog(@"showing chart");
    [self presentModalViewController:landscapeChartViewController animated:NO];
}

if (UIInterfaceOrientationIsPortrait(toInterfaceOrientation)) {
    NSLog(@"dismissing chart");
    [self.parentViewController dismissModalViewControllerAnimated:NO];
    // self.parentViewController seems like a call FROM the modalViewController. 
    // This should be moved to the modalViewControllers implementation
}
}

仅从外观来看，我认为您需要在模态视图内关闭模态视图控制器，而不是在父视图内。因此，您将在主控制器中使用横向版本，然后将“willAnimateRotation...”添加到模态控制器以处理纵向旋转状态。