iOS 9 is the ninth major release of the iOS mobile operating system developed by Apple Inc., being the successor to iOS 8. It was announced at the company's Worldwide Developers Conference on June 8, 2015, and was released on September 16, 2015.

iOS 9.3.4 为您的 iPhone 或 iPad 提供了重要的安全性更新，推荐所有用户安装。 有关 Apple 软件更新的安全性内容，请访问此网站： https://support.apple.com/zh-cn/HT201222

iOS 9是苹果公司研发的移动端操作系统，于北京时间2015年9月16日发布。iOS 9推出了强大的搜索功能和更完善的Siri功能，新增的iPad多任务功能让两个应用能并行排列或通过全新的画中画功能同步运行。

2024年2月26日 · About iOS 9 Updates With this update your iPhone, iPad and iPod touch become more intelligent and proactive with powerful search and improved Siri features. New multitasking features for iPad allow you to work with two apps simultaneously, side-by-side or with the new Picture-in-Picture feature.

2015年6月9日 · iOS 9是美国 苹果公司旗下行动作业系统 iOS的第九个主要版本，取代前代作业系统iOS 8。iOS 9于2015年6月的WWDC大会中首次公布，并于同年9月16日正式推出。继任者为2016年9月13日推出的iOS 10 [3] 。

SAN FRANCISCO — September 9, 2015 — Apple® today announced iOS 9, the world’s most advanced mobile operating system, will be available on Wednesday, September 16 as a free update for iPhone®, iPad® and iPod touch® users. iOS 9 makes iOS devices more intelligent and proactive with powerful search and improved Siri® features, all while ...

iOS 9是 美国 苹果公司 旗下 行动操作系统 iOS 的第九个主要版本，取代前代操作系统iOS 8。 iOS 9于2015年6月的 WWDC 大会中首次公布，并于同年9月16日正式推出。

Apple 软件和硬件的手册、技术规格、下载项目等资源.

2025年1月22日 · iOS 9 (codenamed Monarch) is the ninth version of iOS that was released on 16 September 2015. It was first announced at the WWDC keynote on 8 June 2015.

Download current and previous versions of Apple's iOS, iPadOS, watchOS, tvOS, audioOS and macOS firmware and receive notifications when new firmwares are released.