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这里我创建一个应用程序,我使用Pickerview。我通过此编码成功创建了采集器视图:fetchrequest数组从核心数据中使用选择器视图
(void)viewDidLoad {
[super viewDidLoad];
pickerview =[[UIPickerView alloc]init];
pickerview.frame =CGRectMake(180,250, 145, 10);
pickerview.showsSelectionIndicator=YES;
[self.view addSubview:pickerview];
pickerview.delegate=self;
pickerview.dataSource=self;
iTeacherAppDelegate* delegate = (iTeacherAppDelegate*)[[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [delegate managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription
entityForName:@"Subject" inManagedObjectContext:context];
[fetchRequest setEntity:entity];
***NSArray *temp = [[context executeFetchRequest:fetchRequest error:nil]retain];***
[fetchRequest release];
}
在上面的代码中,我找到了来自executefetchrequest的临时数组。我不能在选择器视图中使用这个数组来显示。当我们尝试然后显示可变数据不是一个cfstring