Objective - C学习 （Foundation框架）-- 02类

NSString NSMutableString
NSArray NSMutableArray
NSSet　NSMutableSet
NSDictionary NSMutableDictionary
NSDate
NSObject

C -> OC字符串
NSString *s = [[NSString alloc] initWithUTF8String:"jake"];

OC -> C
const char *cs = [s UTF8String];
NSUTF8StringEncoding 中文转码

initWithContentsOfFile

[NSURL fileURLWithPath:@"/User/apple/Desktope"];

Objective - C学习 （Foundation框架）-- 02类

原文：http://www.cnblogs.com/fangchun/p/4658398.html