Get the extension of a file contained in an NSString(获取包含在 NSString 中的文件的扩展名)

Pop the current view using Segues/Storyboard on iOS 5(在 iOS 5 上使用 Segues/Storyboard 弹出当前视图)

Trouble creating xmpp muc room: Code 503 (service unavailable)(创建 xmpp muc 房间时遇到问题:代码 503(服务不可用))

How do I create a bold UIFont from a regular UIFont?(如何从常规 UIFont 创建粗体 UIFont?)

Automatic Reference Counting: Pointer to non-const type #39;NSError *#39; with no explicit ownership(自动引用计数:指向非 const 类型“NSError *的指针，没有明确的所有权)

Xcode 4.2 Warnings when dropping Nav Controller on Tab Bar in IB(Xcode 4.2 在 IB 的选项卡栏上放置导航控制器时的警告)

ios 5 UISearchDisplayController crash(ios 5 UISearchDisplayController 崩溃)

How to hide amp; unhide Master View Controller in SplitView Controller(如何隐藏amp;在 SplitView 控制器中取消隐藏主视图控制器)

iOS use the volume buttons as input(iOS 使用音量按钮作为输入)

How to make a uitableview in interface builder compatible with a 4 inch iPhone(如何在界面生成器中制作与 4 英寸 iPhone 兼容的 uitableview)

Accessing a view controller created through Storyboard using the App Delegate(使用 App Delegate 访问通过 Storyboard 创建的视图控制器)

How to disable UITextview selection text, copy/paste UIMenuController but still have hyperlinks working [Not duplicate](如何禁用 UITextview 选择文本，复制/粘贴 UIMenuController 但仍然有超链接工作 [不重复])

Automatic Reference Counting Issue: Passing address of non-local object to __autoreleasing parameter for write-back(自动引用计数问题:将非本地对象的地址传递给 __autoreleasing 参数以进行回写)

iOS 5: Data encryption AES-256 EncryptWithKey: not found(iOS 5:数据加密 AES-256 EncryptWithKey:未找到)

ARC, Blocks and Retain Cycles(ARC、块和保留周期)

CoreBluetooth: What is the lifetime of unique UUIDs(CoreBluetooth:唯一 UUID 的生命周期是多少)

Is there a way to downgrade from iOS 5.1 to iOS 5.0?(有没有办法从 iOS 5.1 降级到 iOS 5.0?)

kill items in a dispatch_async queue in iOS(在 iOS 中杀死 dispatch_async 队列中的项目)

How can I cancel an asynchronous call through NSURLConnection sendAsynchronousRequest?(如何通过 NSURLConnection sendAsynchronousRequest 取消异步调用?)

-[Not A Type retain]: message sent to deallocated instance(-[Not A Type retain]:消息发送到已释放的实例)