они не нужны в принципе. Тут другой принцип работы с аппликациями и распределением памятиНормальные альтернативные таск-менеджеры есть
вот тут чуть более подробно
http://speirs.org/blog/2012/1/2/misconc ... sking.html
When you press the home button, the app moves from Active to Background. Most apps usually then go from Background to Suspended in a matter of seconds.
The first technical caveat is that Suspended apps remain in the device's memory. This is so they can resume more quickly when you go back to them. They're not using processor time and they're not sucking battery power.
You may think that, if an app is resident in memory, you have to somehow remove it to conserve memory. You don't because iOS does it for you. If there are Suspended apps lying around and you launch a memory-intensive app such as a big game, iOS will start to purge Suspended apps and move them to the Not Running state. That is, they will be completely removed from memory and will launch afresh the next time you tap their icon.
Where some people get confused is this: all of the above has no impact on what you see in the multitasking bar. The multitasking bar always shows a list of recently used apps, regardless of whether they're in the Background, Suspended or Not Running states. You may also have noticed that the app that is currently Active does not appear in the multitasking bar.
