编程问答
How to check programmatically if an App is installed?(如果安装了应用程序，如何以编程方式检查?)
How to crop UIImage on oval shape or circle shape?(如何在椭圆形或圆形上裁剪 UIImage?)
iOS 4 app crashes at startup on iOS 3.1.3: Symbol not found: __NSConcreteStackBlock(iOS 4 应用程序在 iOS 3.1.3 上启动时崩溃:找不到符号:__NSConcreteStackBlock)
Adjusting the volume of a playing AVPlayer(调整播放 AVPlayer 的音量)
How to keep an iPhone app running on background fully operational(如何保持在后台运行的 iPhone 应用程序完全可操作)
Get list of installed apps on iPhone(获取 iPhone 上已安装应用程序的列表)
Exit application in iOS 4.0(在 iOS 4.0 中退出应用程序)
Detecting the iPhone#39;s Ring / Silent / Mute switch using AVAudioPlayer not working?(使用 AVAudioPlayer 检测 iPhone 的响铃/静音/静音开关不起作用?)
Get a list of all contacts on iOS(获取 iOS 上所有联系人的列表)
Handling applicationDidBecomeActive - quot;How can a view controller respond to the app becoming Active?quot;(处理 applicationDidBecomeActive -“视图控制器如何响应应用程序变为活动状态?)
Design for Facebook authentication in an iOS app that also accesses a secured web service(为 iOS 应用程序中的 Facebook 身份验证设计，该应用程序还访问安全的 Web 服务)
Install Xcode 3.2.3 w/ iPhone SDK 4, get quot;Base SDK missingquot;, can#39;t see other SDKs(安装带有 iPhone SDK 4 的 Xcode 3.2.3，得到“缺少基本 SDK，看不到其他 SDK)
