不推荐
NSString *str1 = @"str1";
NSString *str2 = @"str2";
NSString *nString = [NSString stringWithFormat:@"%@/%@", str1, str2]);
推荐
NSString *str1 = @"str1";
NSString *str2 = @"str2";
char *c;
asprintf(&c, "%s/%s", str1.UTF8String, str2.UTF8String);
NSString *nString = [NSString stringWithUTF8String:c];
free(c);