在NSUserDefaults中存储自定义对象 [英] Store Custom Objects in NSUserDefaults
本文介绍了在NSUserDefaults中存储自定义对象的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
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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