New Apple vulnerability allows Malicious keylogger App to Record User Inputs
In iOS devices, the application running in the background keeps on refreshing itself; but the researchers also noted that disabling iOS 7's "Background App Refresh" setting would not restrict a malicious app from keylogging.
For example, an app can play music in the background without turning on its "background app refresh" switch. Thus a malicious app can disguise itself as a music app to conduct background monitoring." FireEye explained, So the only present solution to the problem is to manually remove apps from the task switcher.