iOS NSCharacterSet

1: 父类

继承于: NSObject

2: 属性

//所有空格字符的字符集
@property (readonly, class, copy) NSCharacterSet *whitespaceCharacterSet;

//所有空格和换行符的字符集
@property (readonly, class, copy) NSCharacterSet *whitespaceAndNewlineCharacterSet;

3: 方法

4:NSCharacterSet (NSURLUtilities)

//六个允许百分比编码的URL组件和子组件的预定义字符集, 这些字符集被传递给-stringByAddingPercentEncodingWithAllowedCharacters:


//返回url查询组件中允许的字符的字符集
@property (class, readonly, copy) NSCharacterSet *URLQueryAllowedCharacterSet;