IOS:8 Things you should be known about

Interactive notifications and widget
Widgets have finally come to IOS,In IOS 8,you can now perform actions or notifications directly without exiting the app you"re currently in.For example ,if you re using the facebook app and you get a notification about a message,you will be able to reply to the message from the notification pop up itself.Currently,
actionable notifications will be available for messages,calenders reminders and certain third party apps such as facebook.

Sharing and App Store
For parents and families, sharing just got a lot easier. Apple will let families more easily share albums, multimedia and information about their purchases, a direct response to the criticism that Apple makes it too easy for kids to make purchases behind their parents' backs.
The new sharing feature includes an option that lets parents set a requirement that kids ask for permission before they make a purchase on the App Store,
"Parents can now share appropriate content among family members," said Jonathan Godfrey, president of the Association for Competitive Technology, an app developers trade group. "Using the Ask to Buy feature, parents can ensure children get their permission first before downloading free or paid content," he said.


Health
As expected, the company released a health hub that pulls information from  several different apps that measure various bits of health data, such as Nike+, and that promises to aggregate the data that users currently store in several silos of information.
Apple also announced that it is partnering with the Mayo Clinic to let users check metrics such as their heartbeat or blood pressure against what is "healthy" for their bodies.

"We are proud to be at the forefront of this innovative technology with the Mayo Clinic app," Mayo's chief executive, John Noseworthy, said in a statement displayed during the announcement.

 Photos

 iCloud Photo Library is the big new feature in Photos. In theory, every photo and video you take with your iPhone or iPad gets store in iCloud so you can access it from any iPhone, iPad, Mac, or Windows PC, anywhere and any time you want. Apple even promises RAW files will be stored, if that's the original format. In practice, however, the amount stored will depend on how much space you have in your iCloud account, which still starts at a paltry 5GB.
What's more, iCloud Photo Library also stores non-destructive edits, so if you make a change to a photo or video on one device, those changes are synced to any and all other devices logged into the same Apple ID.
Smart search and smart suggestion tries to make it easier for you to find your photos later, with time, location, and album sorting.
There's a new time-lapse mode for the Camera app, and smart composition tools so you can quickly crop and straighten photos. There are also smart adjustments so you can either automagically fix a photo, or manually tweak brightness, contrast, exposure, highlights, shadows, and colors.
Thanks to Extensibility, you can now access third-part filters as well. Thanks to manual camera controls for third-party apps, you will also be able to set everything just the way you like it as well.

iCloud Drive

iOS doesn't expose, and doesn't need to expose a file system. They're horrible relics of inhuman computing days past. However, iOS has always needed a file repository so that documents weren't jailed inside apps. iCloud Drive provides just that. Create a document in any app, on any Apple device, and access it from any compatible app on any other Apple device.
It works for text files. It works of iWork documents. It just works.