NSUserDefaults EXC_BAD_ACCESS

Question

由于“onlineLastUpdatedAt”，我收到错误消息“EXC_BAD_ACCESS”，我不明白为什么。这是我的代码：

#define IMONGGO_PRODUCTS_ONLINE_LAST_UPDATED_AT_KEY @"iMonggoFetcher.ImonggoOnlineProductsLastUpdatedAt"

- (void) saveLastUpdatedAtDate{
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NSMutableArray *onlineLastUpdatedAt = [[defaults objectForKey:IMONGGO_PRODUCTS_ONLINE_LAST_UPDATED_AT_KEY] mutableCopy];
    NSString *onlineLastUpdatedAtValue = [iMonggoFetcher lastUpdatedAtDate];

    if (!onlineLastUpdatedAt) onlineLastUpdatedAt = [[NSMutableArray alloc]init];

    if([onlineLastUpdatedAt containsObject:onlineLastUpdatedAtValue]){
        NSLog(@"onlineLastUpdated at contains a value for onlineLastUpdatedatValue");
        //[defaults setObject:onlineLastUpdatedAt forKey:IMONGGO_PRODUCTS_ONLINE_LAST_UPDATED_AT_KEY];

    }else{
        NSLog(@"!onlineLastUpdated at contains a value for onlineLastUpdatedatValue");

        [onlineLastUpdatedAt addObject:onlineLastUpdatedAt];
        NSLog(@"mutablearray: %@", onlineLastUpdatedAt);
        [defaults setValue:onlineLastUpdatedAt forKey:IMONGGO_PRODUCTS_ONLINE_LAST_UPDATED_AT_KEY];
        [defaults synchronize];
    }
    NSLog(@"added to defaults: %@ ",onlineLastUpdatedAtValue);
}

Answer 1

当您应该致电setValue:ForKey:时，您正在致电setObject:ForKey：

[defaults setValue:onlineLastUpdatedAt forKey:IMONGGO_PRODUCTS_ONLINE_LAST_UPDATED_AT_KEY];

替换为：

[defaults setObject:onlineLastUpdatedAt forKey:IMONGGO_PRODUCTS_ONLINE_LAST_UPDATED_AT_KEY];

Answer 2

您无法直接将任何对象输入NSUserDefaults 首先，您必须将该对象转换为NSData或NSMutableData 试试这个

NSData *dataVal = [NSKeyedArchiver archivedDataWithRootObject:onlineLastUpdatedAt];
[defaults setObject:dataVal forKey:IMONGGO_PRODUCTS_ONLINE_LAST_UPDATED_AT_KEY];
[defaults synchronize];