iOS在TableView内部的内容视图中存在图像对齐问题

Question

I have a custom cell inside an UITableView . Within that custom cell I am trying to put an image and to vertically align it horizontally. As soon as I do that I get that red line.
I have clicked the update frames button, there were no pop up of a menu to select any options.

Heres an image to get a better understanding.
What do I need to do to fix it?

Answer 1

The constraints for your image view are not sufficient for Auto Layout to know where & how big the image view should be:
Constraints for views need to specify the position (x, y) plus the size of the view (width, height).

To fix your issue, add constraints for:

1. leading
2. trailing, or width
3. top
4. bottom, or height

You could also press Add missing constraints in the menu that pops up when you press that |△| button, but I discourage you from doing so, because then it might add constraints you were not actually looking for.