在NSUserDefaults中存储自定义对象 [英] Store Custom Objects in NSUserDefaults

问题描述

我正在尝试按如下方式存储自定义对象，但是我收到错误。

I am trying to store a custom objects as follows, but I am getting an error.

// store data
NSMutableArray *archiveArray = [NSMutableArray arrayWithCapacity:pOrderElements.count];
for (id orderObject in pOrderElements) {
    NSData *personEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:orderObject];
    [archiveArray addObject:personEncodedObject];
}

NSUserDefaults *userData = [NSUserDefaults standardUserDefaults];
[userData setObject:archiveArray forKey:@"personDataArray"];


// retrive data
NSData *data = [userData objectForKey:@"personDataArray"];
// the following line throws an error
id retrieveData = [NSKeyedUnarchiver unarchiveObjectWithData:data];

这是我的pOrderElements

here is my pOrderElements

(lldb) po pOrderElements
<__NSArrayM 0x174256b90>(
{
    category = 1;
    imagePath = "products/chicken-kabob.png";
    name = "Baked Chicken";
    price = "5.49";
}
)

因未捕获的异常而终止应用
'NSInvalidArgumentException'，原因：' - [__ NSCFArray bytes]：
无法识别的选择器发送到实例0x174264f40'

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFArray bytes]: unrecognized selector sent to instance 0x174264f40'

推荐答案

您取消归档不正确的对象。您将NSArray存储到NSUserDefaults

You unarchive incorrect object. You store NSArray to NSUserDefaults

NSArray * archiveArray = [userData objectForKey:@"personDataArray"];
for (NSData *personEncodedObject in archiveArray) {
    id personObject = [NSKeyedUnarchiver unarchiveObjectWithData:personEncodedObject];
}

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