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https://www.bsetec.com/blog/wp-content/uploads/2017/08/multitasking.png1200620Because of the constraints imposed on mobile devices, early versions of iOS did not provide user-application multitasking; only one application runs in the foreground and all other user applications are suspended. Operating system tasks were multitasked because they were written by Apple and well behaved. However, beginning with iOS 4, Apple now provides a limited […]