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标题: ios - 将数据从 NSArray 加载到 NSManagedObject [打印本页]

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作者: 菜鸟教程小白    时间: 2022-12-12 14:29
标题: ios - 将数据从 NSArray 加载到 NSManagedObject

是否可以将数据从 .plist 加载到核心数据对象？ 我有这个代码:

NSURL *url = [[NSBundle mainBundle] URLForResource"List" withExtension"plist"];
NSDictionary *plistContent = [NSDictionary dictionaryWithContentsOfURL:url];

NSArray *name    = [plistContent objectForKey"Name"];
NSArray *surname = [plistContent objectForKey"Surname"];


NSManagedObjectContext *context = [self.fetchedResultsController managedObjectContext];
NSEntityDescription *entity = [[self.fetchedResultsController fetchRequest] entity];
NSManagedObject *newManagedObject = [NSEntityDescription insertNewObjectForEntityForName:[entity name] inManagedObjectContext:context];

for (NSString *aName in name) {
for (int i = 0; i < name.count; i++) {
    [newManagedObject setValue:nameSt forKey"name"];

    }
}
for (NSString *aSurname in content) {
for (int i = 0; i < content.count; i++) {
    [newManagedObject setValue:contentSt forKey"surname"];
    }
}

[self saveContext];

我有 3 个带名字的字符串和 3 个带姓氏的字符串，但是在 newManagedObject 仅从每个数组中加载 1 个字符串。请帮我解决这个问题

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Best Answer-推荐答案

您只创建一个对象，但您应该创建 3 个(在循环内)。你也应该只有 1 个循环(不是你目前拥有的 4 个......):

NSURL *url = [[NSBundle mainBundle] URLForResource"List" withExtension"plist"];
NSDictionary *plistContent = [NSDictionary dictionaryWithContentsOfURL:url];

NSArray *names    = [plistContent objectForKey"Name"];
NSArray *surnames = [plistContent objectForKey"Surname"];

if (names.count == surnames.count) {

    NSManagedObjectContext *context = [self.fetchedResultsController managedObjectContext];
    NSEntityDescription *entity = [[self.fetchedResultsController fetchRequest] entity];

    for (int i = 0; i < names.count; i++) {
        NSString *name = names[i];
        NSString *surname = surnames[i];

        NSManagedObject *newManagedObject = [NSEntityDescription insertNewObjectForEntityForName:[entity name] inManagedObjectContext:context];
        [newManagedObject setValue:name forKey:@"name"];
        [newManagedObject setValue:surname forKey:@"surname"];
    }

    [self saveContext];
} else {
    // error...
}

关于ios - 将数据从 NSArray 加载到 NSManagedObject，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28914323/

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