Programming with Objective-C笔记
2016-12-24 22:23
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一、前言
对象,app是许多种对象构成的。An App Is Built from a Network of Objects类别,用于扩展一个现有类,也可用于隐藏私有方法。Categories Extend Existing Classes
协议,定义了类之间的消息机制,delegate。Protocols Define Messaging Contracts
值和数组常用Objective-C对象表示,如:NSString用于表示字符串,NSNumber表示各种数字,NSValue用来表示C语言中的结构。而常用数组有:NSArray、 NSSet、 和 NSDictionary。Values and Collections Are Often Represented as Objective-C Objects
代码块用于简化日常操作,比如:数组的枚举,查找,校验(collection enumeration, sorting and testing)。它类似于其他语言的“闭包”,也可用于一些同步和异步操作(如:Grand Central Dispatch (GCD)技术)。Blocks Simplify Common Tasks
NSError可以捕获运行时错误,如:存储空间不足、无法连接网络等。Error Objects Are Used for Runtime Problems
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