字符串替换 连接

 NSString *str=[[NSString alloc]initWithFormat:@"123-456-789-000"];
2         
3         //(1)把”－“去掉，并放在数组内  并输出
4         NSArray *arr=[str componentsSeparatedByString:@"-"];
5         NSLog(@"%@%@%@%@",[arr objectAtIndex:0],[arr objectAtIndex:1],[arr objectAtIndex:2],[arr objectAtIndex:3]);
6         //(2)用空字符代替“－“
7         NSString *newStr=[str stringByReplacingOccurrencesOfString:@"-" withString:@""];
8         NSLog(@"%@",newStr);

//
//  main.m
//  作业2
//
//  Created by syrcfwzx on 16/1/6.
//  Copyright (c) 2016年 syrcfwzx. All rights reserved.
//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        //方法1
        NSString* str = @"123-456-789-000";
        NSString* newstr =[str stringByReplacingOccurrencesOfString:@"-" withString:@""];
        NSLog(@"%@",newstr);
        //方法2
        NSArray* array = [str componentsSeparatedByString:@"-"];
        str = [array componentsJoinedByString:@""];
        NSLog(@"%@",str);
        
    }
    return 0;
}

 例子2

//
//  main.m
//  数组
//
//  Created by syrcfwzx on 16/1/7.
//  Copyright (c) 2016年 syrcfwzx. All rights reserved.
//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        //字符串对象分割
        NSString* str = @"how are you";
        NSArray* words = [str componentsSeparatedByString:@" "];
        NSLog(@"%@",words);
        //字符串对象的拼接
        NSArray* words2 = @[@"one",@"two",@"three"];
        NSString* str2 = [words2 componentsJoinedByString:@"-"];
         NSLog(@"%@",str2);
        
    }
    return 0;
}