//常量字符串 NSString char *cstr = "你好啊!yyds"; NSString *str1 = @"123"; NSString *str2 = [NSString stringWithFormat:@"%d",7758258]; NSString *str3 = [NSString stringWithUTF8String:cstr]; NSString *str4 = [[NSString alloc] initWithString:str1]; NSLog(@"%@ %@ %@ %@", str1, str2, str3, str4);