OC5_NSMutableString操作

//
//  main.m
//  OC5_NSMutableString操作
//
//  Created by zhangxueming on 15/6/10.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import <Foundation/Foundation.h>
//NSMutableString 继承与NSString
//所有NSString类的方法NSMutableString 都可以使用

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        //创建指定容量大小的可变字符串对象
        //+ (NSMutableString *)stringWithCapacity:(NSUInteger)capacity;
        NSMutableString *mulStr1 = [[NSMutableString alloc] initWithCapacity:20];
        NSLog(@"mulStr1 = %@", mulStr1);
        
        //替换指定范围内的字符
        //- (void)replaceCharactersInRange:(NSRange)range withString:(NSString *)aString;
        NSMutableString *mulStr2 = [[NSMutableString alloc] initWithString:@"hello world qianfeng"];
        [mulStr2 replaceCharactersInRange:NSMakeRange(6, 5) withString:@"welcome"];
        NSLog(@"mulStr2 = %@", mulStr2);
        
        //在指定位置增加字符串
        NSMutableString *mulStr3 = [[NSMutableString alloc] initWithFormat:@"千锋中国"];
        [mulStr3 insertString:@"hello world" atIndex:2];
        NSLog(@"mulStr3 = %@", mulStr3);
        
        //删除指定范围内的字符
        NSMutableString *mulStr4 = [NSMutableString stringWithUTF8String:"千锋hello world中国"];
        [mulStr4 deleteCharactersInRange:NSMakeRange(2, 11)];
        NSLog(@"mulStr4 = %@", mulStr4);
        
        //追加字符串
        NSMutableString *mulStr5 = [NSMutableString stringWithString:@"helloworld"];
        [mulStr5 appendString:@"qianfeng"];
        NSLog(@"mulStr5 = %@", mulStr5);
        
        //格式化追加字符串
        NSMutableString *mulStr6 = [NSMutableString stringWithFormat:@"%s%d", "hello", 12345];
        [mulStr6 appendFormat:@"%.2f%@", 3.14, @"world"];
        NSLog(@"mulStr6 = %@", mulStr6);
        
        //修改字符串
        NSMutableString *mulStr7 = [[NSMutableString alloc] initWithString:@"hello world"];
        [mulStr7 setString:@"qianfeng"];
        NSLog(@"mulStr7 = %@", mulStr7);
        
    }
    return 0;
}