把一个字符串反输出abc123.xyz789输出987zyx.321cba

#import <Foundation/Foundation.h>

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

@autoreleasepool {

NSString* str = @"abc123.xyz789";

NSInteger len = [str length];

NSMutableString* reverse = [NSMutableString string];

for(NSInteger i=len-1;i>=0;i--)

{

unichar c = [str characterAtIndex:i];

NSString* temp = [NSString stringWithCharacters:&c length:1];

[reverse appendString:temp];

}

NSLog(@"%@",reverse);

}

return 0;

}