In the swift language, there are three types of access modifiers, private,internal and public, respectively. At the same time, Swift's control of access rights is not class-based, but file-based. The difference is as follows:
The properties or methods modified by the 1,privateprivate access level can only be accessed in the current swift source file. 2,internal (the default access level, internal modifier can be written and writable) the properties or methods that the internal access level modifies are accessible throughout the module where the source code resides. If it is a frame or library code, it is accessible throughout the framework and is not accessible when the framework is referenced by external code. If it is an app code, it is also available throughout the app code and within the entire app. 3,public can be used by anyone
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http://www.cnblogs.com/kenshincui/p/4824810.html Swift Development Learning Link
Swift-access Control (private,internal,public)
