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#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

void func(__strong NSString ** str1, __strong NSString ** str2){
    NSString * strNew = @"新的内容1";
    NSString * strNew2 = @"新的内容2";

    *str1 = strNew;
    *str2 = strNew2;
};

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    NSString * str1 = @"str1";
    NSString * str2 =  @"str2";

    // 核心:传入对象引用的指针.
    func(&str1, &str2);
    
    NSLog(@"str1 = %@ \n str2 = %@", str1, str2);
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end