NSUserDefaults存储数据
NSString *string = [NSString stringWithString @"data"];
NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
[ud setObject:string forKey:@"myKey"];
NSString *value;
value = [ud objectForKey:"myKey"];
NSUserDefaults只支持: NSString, NSNumber, NSDate, NSArray, NSDictionary.

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