write_to,会覆盖原来的对象

[biancheng347]

write_to,会覆盖原来的对象

[CoderMJLee]

？？你是说覆盖原来的文件内容？？

[biancheng347]

是的 | | sir wang | | 邮箱：biancheng347@163.com | Signature is customized by Netease Mail Master 在2019年08月23日 12:19，M了个J 写道： ？？你是说覆盖原来的文件内容？？ — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.

[biancheng347]

let file: string = "......./test.data"
let p1 = person()
p1.name = "person1"
wirte(p1,to: file)

let p2 = person()
p2.name = "person2"
wirte(p2,to: file)

应该是[p1,p2]，但是只有p2

[coderflower]

这是合理的

[CoderMJLee]

• 是的哦，我们设计的就是完全覆盖，并非提供追加内容的接口
• 你的需求可以这样实现

let p1 = Person()
var ps = [p1]
write(ps, to: file)

let p2 = Person()
ps.append(p2)
write(ps, to: file)

• 或者

let p1 = Person()
write([p1], to: file)

let p2 = Person()
var ps = read([Person].self, from: file)
ps.append(p2)
write(ps, to: file)

[biancheng347]

我建议可以提供一个接口 write(addOrUpdate: p2,to: file) ,内部代码是

var ps = read([Person].self, from: file)
ps.append(p2)
write(ps, to: file)

上层代码不管这些细节

[CoderMJLee]

谢谢建议，下个版本考虑下