当设备旋转后按比例填充和水平轴时，带有表情符号字符的UIStackView的标签无法正确呈现

Question

I have UIStackView with two UIlabels with vertical axis and fill proportionally distribution and alignment center . One of them contains emoji characters.

This is how it looks in portrait mode:

When device rotates, then I change axis to horizontal , and alignment to first baseline . This is how it looks after rotating:

When label doesn't contain emoji characters everything is fine:

Where is the source of the problem?

Answer 1

Make sure that one of the constraints on the label with the emoji is "height". If one of the constraints is already "height", try making the height of the larger.

Answer 2

The answer is in the following method, which should be added to controller:

override func traitCollectionDidChange(previousTraitCollection: UITraitCollection?) {
    view.layoutSubviews()
    view.layoutIfNeeded()
}