OC语法之NSString

////  main.m//  NSString////  Created by New-World on 13-10-30.//  Copyright (c) 2013年 Gary. All rights reserved.//#import <Foundation/Foundation.h>#import "string.h"#pragma mark NSString的创建int main(int argc, const char * argv[]){    @autoreleasepool {//       //--------------------------NSNumber--------------------////    //创建一个NSNumber对象1.类方法 2.实例方法//        NSNumber *monthNumber=[NSNumber numberWithInt:10];//        NSNumber *lengthNumber=[[NSNumber alloc] initWithFloat:10.8];//        NSLog(@"monthNumber:%@",lengthNumber);//    //还原成基本类型//        int month=[monthNumber intValue];//        float length=[lengthNumber floatValue];//        NSLog(@"%i",month);//        NSLog(@"%f",length);                //创建了一个字符串常量        NSString *str0=@"这是一个字符串";        //创建了一个空字符串        NSString *str1=[[NSString alloc] init];        //NSString *str2=[NSString string];        //快速创建一个字符串 常量区        NSString *str3=[[NSString alloc] initWithString:@"apple"];        //NSString *str40=[NSString stringWithString:@"xyz"];        //NSString *str41=[NSString stringWithString:@"xyz"];        //创建一个格式化字符串 堆区        NSString *str5=[[NSString alloc] initWithFormat:@"a"];        NSString *str6=[[NSString alloc] initWithFormat:@"b"];        NSString *str7=[NSString stringWithFormat:@"%f",3.2];        NSString *str8=[NSString stringWithFormat:@"%f",3.2];        NSLog(@"%@ %@ %@",str0,str1,str8);                if([str7 isEqualToString:str8])//比较内容        {            NSLog(@"same content");        }        else{            NSLog(@"different content");        }                if (str7 == str8)//比较地址        {            NSLog(@"same pointer");        }        else{            NSLog(@"different pointer");        }        NSComparisonResult s=[str5 caseInsensitiveCompare:str6];//比较字符串的大小        NSLog(@"result: %ld",s);        //转换成基本数据类型        NSLog(@"%f",[str8 floatValue]);        //字符串的转换        NSLog(@"%@",[str3 uppercaseString]);//大写        NSLog(@"%@",[str3 lowercaseString]);//小写        NSLog(@"%@",[str3 capitalizedString]);//首字母大写                //字符串转换成数组        NSString *str=@"abc bdc dds";        NSArray *array=[str componentsSeparatedByString:@" "];        NSLog(@"%@",array);        //字符串的截取                NSString *str10=@"bacbcbcbc";        NSString *subString1=[str10 substringFromIndex:3];//从下标为3开始截取，不包含下标为3的字符        NSString *subString2=[str10 substringToIndex:3];//截取到下标为3的字符        NSLog(@"%@ %@",subString1,subString2);                NSRange rang;        rang.location=2;//截取的位置        rang.length=2;//截取的长度        NSString *string3=[str3 substringWithRange:rang];        NSLog(@"%@",string3);                //字符串的拼接        NSString *Pstr1=@"ni",*Pstr2=@"hao";        NSString *PWstr=[[NSString alloc] initWithFormat:@"这是拼接的字符串：%@%@",Pstr1,Pstr2 ];                   NSString *PWstr1=[Pstr1 stringByAppendingFormat:@"%@",Pstr2];        NSString *PWstr2=[Pstr1 stringByAppendingString:Pstr2];        NSLog(@"%@ %@ %@",PWstr1,PWstr2,PWstr);                                //字符串的查询        NSRange range=[str10 rangeOfString:@"ac"];        NSLog(@"%@",NSStringFromRange(range));        if(range.location!=NSNotFound)        {            NSLog(@"string 找到了");        }        //----------------------华丽的分割线----------------------        //可变字符串的操作        //1.插入字符串        NSMutableString *mu=[[NSMutableString alloc]initWithFormat:@"abcdefg"];        [mu insertString:@"oooo" atIndex:3];        NSLog(@"mu :%@",mu);        //替换字符串        [mu replaceCharactersInRange:NSMakeRange(0, 3) withString:@"asssss"];        NSLog(@"mu :%@",mu);        //删除字符串        [mu deleteCharactersInRange:NSMakeRange(1, 2)];        NSLog(@"mu :%@",mu);    }        return 0;}