iphone - 从 willAnimateRotationToInterfaceOrientation 如何获取旋转后 View 的大小？

Question

我试图在设备旋转时调整 UIView 中对象的大小，而不对宽度和高度进行硬编码。在此代码中，我如何获得 newWidth 和 newHeight？

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
    child.frame = CGRectMake(10, 10, newWidth - 20, newHeight - 20);
}

Answer 1

这大概是正确的。

- (void)willAnimateRotationToInterfaceOrientation:
    (UIInterfaceOrientation)toInterfaceOrientation
    duration:(NSTimeInterval)duration
{
    // we grab the screen frame first off; these are always
    // in portrait mode
    CGRect bounds = [[UIScreen mainScreen] applicationFrame];
    CGSize size = bounds.size;

    // let's figure out if width/height must be swapped
    if (UIInterfaceOrientationIsLandscape(toInterfaceOrientation)) {
        // we're going to landscape, which means we gotta swap them
        size.width = bounds.size.height;
        size.height = bounds.size.width;
    }
    // size is now the width and height that we will have after the rotation
    NSLog(@"size: w:%f h:%f", size.width, size.height);
}