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Belongs to the Foundation framework A formatter providing methods for converting from Date to String and from String to Date. This is a Date or Time object represented in units such as year, month, day, minute or hour in a particular calendar.It also allows you to customize the representation of the date string using predefines styles or building your own format. It provides direct access to different parts of date or time.

When numeric fields abut one another directly, with no intervening delimiter characters, they constitute a run of abutting numeric fields. For example, the format "HHmmss" parses the input text "123456" to , parses the input text "12345" to , and fails to parse "1234".

i OS 教程 i OS 简介 i OS环境搭建 Objective C 基础知识 创建第一款i Phone应用程序 i OS操作(action)和输出口(Outlet) i OS - 委托(Delegates) i OS UI元素 i OS加速度传感器(accelerometer) i OS通用应用程序 i OS相机管理 i OS定位操作 i OS SQLite数据库 i OS发送电子邮件 i OS音频和视频(Audio & Video) i OS文件处理 i OS地图开发 i OS应用内购买 i OS整合i AD i OS Game Kit i OS 故事板(Storyboards) i OS自动布局 i OS Twitter和Facebook i OS内存管理 i OS应用程序调试 - (BOOL)application:(UIApplication *)application did Finish Launching With Options:(NSDictionary *)launch Options self.window = Master View Controller alloc] init With Nib Name:@"Master View Controller" bundle:nil]; UINavigation Controller *master Navigation Controller = Master View Controller alloc] init With Nib Name:@"Master View Controller" bundle:nil]; UINavigation Controller *master Navigation Controller = [[UINavigation Controller alloc] init With Root View Controller: master View Controller]; Detail View Controller *detail View Controller = [[Detail View Controller alloc] init With Nib Name:@"Detail View Controller" bundle:nil]; UINavigation Controller *detail Navigation Controller = [[UINavigation Controller alloc] init With Root View Controller: detail View Controller]; master View Controller.detail View Controller = detail View Controller; self.split View Controller = [[UISplit View Controller alloc] init]; self.split View Controller.delegate = detail View Controller; self.split View Controllers = @[master Navigation Controller, detail Navigation Controller]; self.View Controller = self.split View Controller; [self.window make Key And Visible]; return YES; } #import "Master View Controller.h" #import "Detail View Controller.h" @interface Master View Controller () @end @implementation Master View Controller - (id)init With Nib Name:(NSString *)nib Name Or Nil bundle:(NSBundle *) nib Bundle Or Nil - (void)view Did Load - (void)did Receive Memory Warning - (void)insert New Object:(id)sender #pragma mark - Table View - (NSInteger)number Of Sections In Table View:(UITable View *)table View - (NSInteger)table View:(UITable View *)table View number Of Rows In Section: (NSInteger)section // Customize the appearance of table view cells.This is repeated until either the parse succeeds or the leftmost field is one character in length.If the parse still fails at that point, the parse of the run fails.

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目前在 i OS 和 OS X 中有两套先进的同步 API 可供我们使用:NSOperation 和 GCD 。其中 GCD 是基于 C 的底层的 API ,而 NSOperation 则是 GCD 实现的 Objective-C API。 虽然 NSOperation 是基于 GCD 实现的, 但是并不意味着它是一个 GCD 的 “dumbed-down” 版本, 相反,我们可以用NSOperation 轻易的实现一些 GCD 要写大量代码的事情。 因此, NSOperation Queue 是被推荐使用的, 除非你遇到了 NSOperation Queue 不能实现的问题。 曾经我有一段时间我非常喜欢使用GCD来进行并发编程,因为虽然它是C的api,但是使用起来却非常简单和方便, 不过这样也就容易使开发者忘记并发编程中的许多注意事项和陷阱。 比如你可能写过类似这样的代码(这样来请求网络数据): 是同步的拉取数据,它会一直阻塞线程直到完成请求,如果是遇到了超时的情况,它在这个时间内会一直占有这个线程;在这个期间并发队列就需要为其他任务新建线程,这样可能导致性能下降等问题。 因此我们不推荐这种写法来从网络拉取数据。 操作队列(operation queue)是由 GCD 提供的一个队列模型的 Cocoa 抽象。GCD 提供了更加底层的控制,而操作队列则在 GCD 之上实现了一些方便的功能,这些功能对于 app 的开发者来说通常是最好最安全的选择。NSOperation Queue相对于GCD来说有以下优点: 或许你感觉到他们有些神奇,希望我的解释能让你明白一些.

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