Your iPhone apps are stuck on download or install and it is holding on keep waiting. These might be frozen with a blank icon.
Method 1: I solved it by performing this solution:
1. Log-Out from App Store: Navigate to Settings -> Store -> Apple ID -> Sign Out.
2. Turn-Off your iPhone.
3. Turn-On after 1 minute
4. Open the App Store and Navigate. You will be asked to Sign-in again. Log in and the stuck apps should reset.
Method 2: There is one more way to perform installation / updates by using computer.
Connect your iPhone to computer and open iTunes. Go to the app store. Install the apps you are having a problem and sync your iPhone.