在Xcode中从核心数据填充数组 [英] Populating an Array from Core Data in Xcode

问题描述

我试图使用从CoreData获取的数据集合填充 NSArray 。但我的数组似乎没有填充数据。我有以下代码检索数据：

I am trying to populate an NSArray with a collection of data I get from CoreData. But my array doesnt seem to be populating with the data. I have the following code to retrieve the data:

NSManagedObjectContext *managedObjectContext = [self managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc]
                                initWithEntityName:@"WeightLog"];
self.contactarray = [[managedObjectContext executeFetchRequest:fetchRequest
                                                         error:nil] mutableCopy];

并且我使用下面的for循环来填充NSArray与我从WeightLog收集的数据a特定字段。

And I am using the following for loop to populate the NSArray with the data I collect from WeightLog for a particular field.

for (int i =0; i<=self.contactarray.count; i++) {
    NSManagedObject *device = [self.contactarray objectAtIndex:i];
    [titleNames addObject:device];
}

只是因为您知道 contactarray 我的.h文件格式如下：

Just so you know contactarray is a property in my .h file of the following format:

@property (strong) NSMutableArray *contactarray;

你能告诉我哪里出错了，我是iOS开发的新手

Can you tell me where I am going wrong please, I am fairly new to iOS Development, if it doesn't show.

提前感谢您

推荐答案

titleNames 数组。试试这个，

titleNames = [[NSMutableArray alloc] init];
for (int i =0; i<=self.contactarray.count; i++) {
    NSManagedObject *device = [self.contactarray objectAtIndex:i];
    [titleNames addObject:device];
}

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