Will my app be rejected on warnings in the console like: Unable to simultaneously satisfy constraints
Or does this not matter?
Your app will only get rejected if it doesn't comply to Apple's standards (which you can look up), i.e. it crashes, has some weird behaviour, inappropriate content, plagiarism and so on. However warnings usually show you that there is something unusual in your code (or StoryBoard/XIB file). Even if it doesn't directly jeopardize your chances of getting your app into the app store I suggest you try to reorganize your constraints. Apple might change the way Xcode resolves these conflicts in the future and could possibly break your User Interface.