8.5. Practical uses of runtime type introspection

The iOS development platform has matured with multiple versions of the iPhone operating system and variants for the iPad all exhibiting slightly different capabilities and restrictions.

It’s now common to want to develop an application that can use features specific to a newer version of the iOS operating system yet still be able to run the application on a device with an older version of the operating system that doesn’t provide the feature. Using a number of techniques discussed in this chapter, this goal can often be achieved.