摘要： 简单的介绍1.1定义协议:创建一个.h文件 1: _MyProtocolName.h 2: @protocol MyProtocolName 3: @end 注:协议中没有变量;是代表在此声明的协议是NSObject协议的衍生协议（不是NSObject类);1.2使用协议: 1: @interface CustomView:UIView 代表CustomView遵循我们制定的这个协议，需要实现协议的方法1.3用协议修饰变量:如果这样定义一个变量: 1: idmyNewVariable;那么myNewVaiable是遵循我们制定的这个MyProtocolName协议的如果定义函数... 阅读全文

摘要： So as I work my way through understanding string methods, I came across this useful class NSCharacterSet which is defined in this post quite well as being similar to a string excpet it is used for holding the char in an unordered set What is differnce between NSString and NSCharacterset?So then I ca 阅读全文