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iOS 9 is the ninth release of the iOS mobile operating system designed by Apple Inc which is the successor to iOS 8. It was announced at the company's Worldwide Developers Conference 2015 on June 8, 2015, and was released on September 16, 2015. iOS 9 focuses less on new features and more on under-the-hood optimizations, as well as battery improvements. On September 21, 2015, Apple announced that iOS 9 had been installed on more than 50% of active iOS devices, making it the fastest adoption rate for a new operating system and significantly faster than that of its predecessor. , iOS 9 has been installed on 70% of compatible Apple devices.〔(【引用サイトリンク】url=https://developer.apple.com/support/app-store/ )〕 ==History== (詳細はApple Worldwide Developers Conference on June 8, 2015, with iOS 9.0 beta 1 being made available to registered developers straight after the keynote, and a public beta made available to members of Apple's Beta Software Program in July. iOS 9 was released publicly on September 16, 2015. iOS 9.0.1 was released on September 23, 2015, as the first update to iOS 9. It fixed a major bug that caused the "Slide to Upgrade" screen to freeze when updating from earlier versions of iOS. iOS 9.0.2 was released on September 30, 2015, to fix a major lock screen bypass issue. iOS 9.1 was released on October 21, 2015.〔(【引用サイトリンク】 url = http://www.macrumors.com/2015/10/21/apple-releases-ios-9-1/ )〕 It includes support for the iPad Pro and Apple Pencil and the 4th generation Apple TV.〔(【引用サイトリンク】 url = http://www.thereportertimes.com/apple-ios-9-0-2-released-with-fixes-for-imessage-icloud-drive-podcasts/7371/ )〕〔(【引用サイトリンク】url=http://www.cnet.com/news/ios-9-release-sept-16/ )〕〔(【引用サイトリンク】url=http://www.theverge.com/2015/9/9/9245073/apple-ios-9-download-release-date-iPhone-upgrade )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「IOS 9」の詳細全文を読む スポンサード リンク
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