调整UILabel大小正确在UIImageView顶部

Question

My problem is as follows: I have on top of a UIImageView some labels. The image is a formular and the UILabel s represents the entries. If I rotate the device the image inside UIImageView gets resized with option "aspect fit". How can I achieve that the UILabel is also resized and aligned correct? The normal options for resizing aren't working as needed. The UIImageView is zoomable with minimumZoomScale and maximumZoomScale set.

Thanks.

Answer 1

You can resize a UILabel proportionally using:

label.transform = CGAffineTransformMakeScale(0.5, 0.5);

You can reposition a UILabel relatively using:

label.frame = CGRectOffset(label.frame, deltaX, deltaY);

The rest is maths =)

---

So I managed to solve your problem. Full source code here .

Basically I removed your UIImageView and replaced it with a UIView . Then I added your UILabel s within the UIView and removed any autosizing from the UIView and UILabel s in interface builder. That way when the UIView gets resized any content in it will get resized/repositioned as well.

The next step was to change the class of the UIView to UIImageView in interface builder. Now from the source code I could set an image to it using imgView.image = [UIImage imageNamed:@"imagename.png"]; as well as I could set the mode using imgView.contentMode = UIViewContentModeScaleAspectFit; .

The transformation at rotation now happens with:

if (UIDeviceOrientationIsLandscape(deviceOrientation)){

    // Play with the scale if you have any other images with different ratio.
    float scale = 2.3f/3.0f;

    // Transforming the UIImageView containing the UILabels which actually is a simple UIView
    imgView.transform = CGAffineTransformMakeScale(scale, scale);

} else {

    // Original size again
    imgView.transform = CGAffineTransformMakeScale(1, 1);

}