Objectiv-C实现字符串反序的两种方法

第一种方法：(注意中文字符串的处理)

#import <Foundation/Foundation.h>

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

{

NSString *[email protected]"我是一个字符串";

NSMutableString *str1=[NSMutableString string];

NSMutableString *str2=[NSMutableString stringWithUTF8String:[str UTF8String]];

int i=0;

while (i!=[str2 length])

{

NSString *str3=[str2 substringWithRange:NSMakeRange([str2 length]-i-1, 1)];

[str1 appendFormat:@"%@",str3];

i++;

}

NSLog(@"str1:%@",str1);

return 0;

}

第二种方法：（注意中文字符串的处理）

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

{

NSString *str = @"我是一个字符串";

NSMutableString *str1=[NSMutableString string];

int i=0;

NSMutableString *str2=[NSMutableString stringWithUTF8String:[str UTF8String]];

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

while (i!=[str2 length])

{

unichar ch=[str2 characterAtIndex:[str2 length]-i-1];

NSString *str4=[NSString stringWithCharacters:&ch length:1];

[str1 appendString:str4];

i++;

}

NSLog(@"str1:%@",str1);

return 0;

}