Question

我创建了一个容器视图控制器，其中包含3个控制器，这是第二个视图控制器（VC）。当我在第一个VC中移动第一个VC代替第二个和第二个VC时出现此错误：

＆＃39; NSInvalidArgumentException＆＃39;，原因：＆＃39; + entityForName：nil不是合法的NSManagedObjectContext参数，用于搜索实体名称＆＃39;程序＆＃39;＆＃39;

NSEntityDescription *entitydesc = [NSEntityDescription entityForName:@"Programs" inManagedObjectContext:context];
    NSFetchRequest *request = [[NSFetchRequest alloc]init];
    request.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"programId" ascending:YES]];


request.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"startTime" ascending:NO], [NSSortDescriptor sortDescriptorWithKey:@"day" ascending:YES]];

我的视图控制器代码

if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
controller1 = [[Home alloc]initWithNibName:@"Home" bundle:nil];
}
else
{
    controller1 = [[Home alloc]initWithNibName:@"Home_iPad" bundle:nil];
}
controller1.title = @"Home";
controller1.delegate2 = self;

controller2 = [storyboard instantiateViewControllerWithIdentifier:@"Activity"];
controller2.title = @"Activity";
controller2.delegate = self;


if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
controller3 = [[League alloc] initWithNibName:@"League" bundle:nil];
}
else
{
    controller3 = [[League alloc] initWithNibName:@"League_iPad" bundle:nil];
}
controller3.title = @"League";



//    controller4 = [[Messages alloc] initWithNibName:@"Messages" bundle:nil];
//    controller4.title = @"Message";



NSArray *controllerArray = @[ controller2,controller1, controller3];

Answer 1

你能告诉我（.m）文件代码吗？所以我可以帮助你。因为你的“背景”是零。

如何解决＆＃39; NSInvalidArgumentException＆＃39;，原因：＆＃39; + entityForName：nil不是合法的NSManagedObjectContext

1 个答案: