Adjusting the volume of a playing AVPlayer(调整播放 AVPlayer 的音量)

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)

How to crop UIImage on oval shape or circle shape?(如何在椭圆形或圆形上裁剪 UIImage?)

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 add a UIView above the current UITableViewController(如何在当前 UITableViewController 上方添加一个 UIView)

How to check if a font is available in version of iOS?(如何检查字体是否在 iOS 版本中可用?)

Scroll UITextField above Keyboard in a UITableViewCell on a regular UIViewController(在常规 UIViewController 上的 UITableViewCell 中的键盘上方滚动 UITextField)

Display datepicker on tapping on textfield(在点击文本字段时显示日期选择器)

NSDateFormatter returning nil in OS 4.0(NSDateFormatter 在 OS 4.0 中返回 nil)

Deleting all the files in the iPhone sandbox (documents folder)?(删除 iPhone 沙箱(文档文件夹)中的所有文件?)

Is ARC really supported in iOS 4? The iOS 4.2 SDK is missing ARC-related symbols at linking time(iOS 4 真的支持 ARC 吗?iOS 4.2 SDK 在链接时缺少与 ARC 相关的符号)

Detecting call state in iOS4(在 iOS4 中检测通话状态)

Obtaining Specific ABSource from ABAddressBook in iOS 4+(在 iOS 4+ 中从 ABAddressBook 获取特定的 ABSource)

Make Swap Vertical and Horizontal Work With Two Adapters(使用两个适配器进行垂直和水平交换)

Send Data from Activity to TabLayout fragments(将数据从 Activity 发送到 TabLayout 片段)

Grid layout within tabs(选项卡内的网格布局)

Is Nested Fragment Possible?(嵌套片段可能吗?)

How to get soon-to-be-selected page while settling snapping feature on RecyclerView and ViewPager(如何在解决 RecyclerView 和 ViewPager 上的捕捉功能时获得即将被选中的页面)

Passing a Fragment in the constructor of an Adapter(在适配器的构造函数中传递片段)

Android ViewPager orientation change(Android ViewPager 方向改变)