//

//  main.m

//  NSString

//

//  Created by WildCat on 13-7-25.

//  Copyright (c) 2013年 wildcat. All rights reserved.

//

#import <Foundation/Foundation.h>

#pragma mark 创建字符串

void testCreat(){

    NSString *str=@"你好。";

    NSLog(@"str :%@",str);

    NSString *str2=[NSString stringWithUTF8String:"哈哈哈"];

    NSLog(@"str2 :%@",str2);

    NSString *str3=[[NSString alloc] initWithString:@"测试3"] ;

    NSLog(@"str3 :%@",str3);

}

#pragma mark 字符串的搜索

void search(){

    NSString *str=@"123456456.txt";

    NSLog(@"是否以 123 开头:%i",[str hasPrefix:@"123"]);

    NSLog(@"是否以 txt 结尾:%i",[str hasSuffix:@"txt"]);

    //从前向后搜索

    NSRange range=[str rangeOfString:@"456"];

    if (range.location==NSNotFound) {

         NSLog(@"未找到");

    }else{

        NSLog(@"找到的范围是：%@",NSStringFromRange(range));

    }

    //从后向前搜索

    range=[str rangeOfString:@"456" options:NSBackwardsSearch ];

     NSLog(@"找到的范围是：%@",NSStringFromRange(range));

}

#pragma mark 字符串截取

void mysubString(){

    NSString *str=@"123456789";

    //从第6个位置开始截取

    NSLog(@"%@",[str substringFromIndex:6]);

    //截取到第6个位置

    NSLog(@"%@",[str substringToIndex:6]);

    //随便截取一段字符串

    NSLog(@"%@",[str substringWithRange:NSMakeRange(1, 3)]);

    NSString *str2=@"1-2-a-b-c";

    //字符串分割

    NSArray *array=[str2 componentsSeparatedByString:@"-"];

    NSLog(@"%@",array);

}

#pragma mark 与路径相关

void stringWithPath(){

    //快速创建一个自动释放的数组

    NSMutableArray *array=[NSMutableArray array];

    [array addObject:@"User"];

    [array addObject:@"Wildcat"];

    [array addObject:@"APP"];

    //通过一个数组创建一个路径字符串

    NSString *path=[NSString pathWithComponents:array];

    NSLog(@"Path is:%@",path);

    //把一个路径截取为数组

    NSArray *apath=[path pathComponents];

    NSLog(@"Array is；%@",apath);

    //删除最后一个目录

    NSLog(@"Array is；%@",[path stringByDeletingLastPathComponent]);

    //拼接一个路径

     NSLog(@"Array is；%@",[path stringByAppendingPathComponent:@"123.txt"]);

}

#pragma mark 其他用法

void other(){

    NSString *str=@"123";

    int a=[str intValue];//转化为整数

    NSLog(@"%i",a);

    //计算字数而不是字符数

    NSLog(@"length=%zi",[@"我是字符串12345" length]);

    //返回对应的字符

    unichar c=[@"abc123" characterAtIndex:1];

    NSLog(@"第2个字符是：%c",c);

    //返回C语言字符串

    const char *s=[@"abc" UTF8String];

    NSLog(@"C语言字符串是：%s",s);

}

#pragma mark 主函数

int main(int argc, const char * argv[])

{

    @autoreleasepool {

       // testCreat();

       // creatWithContent();

        //writeToFile();

        //search();

        //调用截取字符串函数

        //mysubString();

        //stringWithPath();

        other();

    }

    return 0;

}