First released on June 29, 2007, iOS is the name of Apple’s platform for mobile applications. Unlike Android, Apple does not license iOS for installation on non-Apple hardware. iOS and iOS applications are only installed on Apple devices. Your app must be compatible with 4 types of devices and iOS versions.
It doesn't matter how much time you invest in design and implementation, mistakes are inevitable, and bugs will appear. There are some common bugs on iOS application.
One of the most frustrating problems, when using Apple's devices, is that an application may crash frequently during execution. Many times the app crashes because there's some bugs or memory leak in apps.
Your iOS application may run perfectly on current iOS version, but if iOS is upgraded it may not work due to incompatibility issues.
Security vulnerability in iOS allow the hacker to attack your iOS devices, steal your private information. Until now, severe iPhone security vulnerabilities are discovered in different iOS versions.
Memory leaks are blocks of allocated memory that the program no longer uses. Memory leaks cause your iOS application to crash. They are bugs and should always be fixed.