How to be sure the app is accepted by Apple?

To be sure your app will be validated by Apple you have some tips to know (on Google Play there is no validation, so it's more easy):

• All your pages have to be filled out with content. Please be sure you have no empty pages. If you have a news wall feature for example, create a news, and with a picture it would even better.
• Content: no explicit contents in your apps! But it was obvious ;)
• Design: please choose cool colors with complementarity. If you don't really know how to find colors with complementarity you can use http://colorschemedesigner.com/. But no rainbow apps, please don't.
• Features: Apple want useful apps. So don't create apps with only one or two features. And enter relevant content with multimedia (videos, images, etc)
• Write a good description of your app. You have to explain what the users would be able to find in your application, and why they have to download it. (250 characters minimum).
• Never talk about other platforms in your app! Apple doesn't want you to talk about Android or Google Play, or Samsung in apps that are on the Apple App Store. Even if there is a logo, or an image about an Apple competitor, your app will be rejected.
• If there is an account registration tab in your app, or part of your app that is blocked with the Padlock feature, be sure to provide test credentials to Apple in the "Demo" fields on itunesconnect.apple.com when publishing your app. Fill out the “support policy” url too.
• Never user test content in your app, like "Lorem Ipsum" content or "test", "demo", etc. Apple refuses apps that are not finished, and/or apps for tests.
• Choose the right rating for your app. If your app is a Club app you have to set the rating to 17+ even if there is no photos, or products related to alcohol.
• Before compiling your app in Xcode be sure to deactivate the Audio Background modes if it’s not an app about music.