如何从Objective C，iOS中的NSUserDefaults获取确切数据？

Question

我有NSMutableArray，我试图将该数组保存在NSUserDefaults中。这是我的代码：

保存：

NSUserDefaults *currentDefaults = [NSUserDefaults standardUserDefaults];
[currentDefaults setObject:[NSKeyedArchiver archivedDataWithRootObject:userSession.transactionArray] forKey:@"TransId"];
[currentDefaults synchronize];

检索：

NSUserDefaults *currentDefault = [NSUserDefaults standardUserDefaults];
NSData *dataRepresentingSavedArray = [currentDefault objectForKey:@"TransId"];
NSMutableArray *oldSavedArray = [NSKeyedUnarchiver unarchiveObjectWithData:dataRepresentingSavedArray];
userSession.transactionArray = [NSArray arrayWithArray:oldSavedArray];

但是，我正在日志中获取阵列，

"<NSIndexPath: 0x160f8640> {length = 2, path = 0 - 0}",
"<NSIndexPath: 0x1602bd70> {length = 2, path = 0 - 1}",
"<NSIndexPath: 0x16026900> {length = 2, path = 0 - 2}",
"<NSIndexPath: 0x14f01dd0> {length = 2, path = 0 - 3}"

如何从中获取实际数据。有人可以帮助我正确获取此值吗？ 提前致谢。

Answer 1

 NSArray *aviArray=[[NSArray alloc] initWithObjects:@"A",@"B",@"C", nil];
[[NSUserDefaults standardUserDefaults] setObject:aviArray forKey:@"Arraykey"];
[[NSUserDefaults standardUserDefaults] synchronize];

 NSLog(@"%@",[[[NSUserDefaults standardUserDefaults] objectForKey:@"Arraykey"] objectAtIndex:0]); 

 NSLog(@"%@",[[NSUserDefaults standardUserDefaults] objectForKey:@"Arraykey"]);

Answer 2

这类似于： NSKeyedArchiver archivedDataWithRootObject：

您缺少initWithCoder：和encodeWithCoder：的实现。 答案之一描述了如何编写这些内容。