字符串-mutableString

//
//  main.m
//  foundation-mutableString
//
//  Created by apple on 15/6/28.
//  Copyright (c) 2015年 itcast. All rights reserved.
//

#import <Foundation/Foundation.h>

#pragma mark 可变字符串的创建
void stringCreate(){
    NSMutableString *str =[[NSMutableString alloc]initWithCapacity:15];
    [str setString:@"12345"];
    NSLog(@"%@",str);
    
    [str appendString:@"1234214"];
    NSLog(@"%@",str);
    [str appendFormat:@"age is %i and height is %.2f",27,1.88f];
    NSLog(@"%@",str);
    //替换字符串
    NSRange range = [str rangeOfString:@"age"];
    [str replaceCharactersInRange:range withString:@"我爱你"];
    NSLog(@"%@",str);
    //插入字符串
    [str insertString:@"&&&" atIndex:2];
    NSLog(@"%@",str);
    //删除字符串
    NSRange range1 = [str rangeOfString:@"height"];
    [str deleteCharactersInRange:range1];
    NSLog(@"%@",str);
}

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        stringCreate();
    }
    return 0;
}