嗨，我几乎是编程新手。我面临一个我无论如何都无法解决的错误。即使在与花药溶液进行比较之后。我已经为此工作了大约 3 天。
所以让我完全描述我的问题：
1.这是我的实现代码：
#import "DocumentTableViewController.h"
#import "AddDocumentTableView.h"
#import "DB_document.h"
@implementation DocumentTableViewController
@synthesize managedObjectContext;
@synthesize btnAddDocument;
@synthesize fetchedObjects;
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
NSManagedObjectContext *context = managedObjectContext;
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"DB_document" inManagedObjectContext:context];
[fetchRequest setEntity:entity];
NSError *error;
fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
NSLog(@"%d",[fetchedObjects count]);
}
- (void)viewDidUnload
{
[self setBtnAddDocument:nil];
[super viewDidUnload];
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 2;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
int result = 0;
if (section == 0)
{
result = [fetchedObjects count] + 1;
}
else if (section == 1)
{
result = 1;
}
return result;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 40;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
DB_document *db_document = [fetchedObjects objectAtIndex:indexPath.row];
if (indexPath.section == 0 && indexPath.row == 0)
{
UILabel *lblMoney = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, 70, 40)];
lblMoney.text = @"amount";
lblMoney.textAlignment = UITextAlignmentCenter;
lblMoney.textColor = [UIColor blackColor];
lblMoney.backgroundColor = [UIColor clearColor];
lblMoney.font = [UIFont systemFontOfSize:12];
[cell addSubview:lblMoney];
UILabel *lblDescription = [[UILabel alloc] initWithFrame:CGRectMake(85, 0, 150, 40)];
lblDescription.text = @"description";
lblDescription.textAlignment = UITextAlignmentCenter;
lblDescription.textColor = [UIColor blackColor];
lblDescription.backgroundColor = [UIColor clearColor];
lblDescription.font = [UIFont systemFontOfSize:12];
[cell addSubview:lblDescription];
UILabel *lblDate = [[UILabel alloc] initWithFrame:CGRectMake(240, 0, 70, 40)];
lblDate.text = @"date";
lblDate.textAlignment = UITextAlignmentCenter;
lblDate.textColor = [UIColor blackColor];
lblDate.backgroundColor = [UIColor clearColor];
lblDate.font = [UIFont systemFontOfSize:12];
[cell addSubview:lblDate];
UIButton *btnLine1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btnLine1.frame = CGRectMake(80, 0, 1, 40);
[cell addSubview:btnLine1];
UIButton *btnLine2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btnLine2.frame = CGRectMake(240, 0, 1, 40);
[cell addSubview:btnLine2];
return cell;
}
if (indexPath.section == 0 && indexPath.row != 0)
{
UILabel *lblMoney = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, 70, 40)];
lblMoney.text = [NSString stringWithFormat:@"%d",db_document.docAmount];
lblMoney.textAlignment = UITextAlignmentCenter;
lblMoney.textColor = [UIColor blackColor];
lblMoney.backgroundColor = [UIColor clearColor];
lblMoney.font = [UIFont systemFontOfSize:12];
[cell addSubview:lblMoney];
UILabel *lblDescription = [[UILabel alloc] initWithFrame:CGRectMake(85, 0, 150, 40)];
lblDescription.text = db_document.docDescription;
lblDescription.numberOfLines = 2;
lblDescription.textAlignment = UITextAlignmentCenter;
lblDescription.textColor = [UIColor blackColor];
lblDescription.backgroundColor = [UIColor clearColor];
lblDescription.font = [UIFont systemFontOfSize:12];
[cell addSubview:lblDescription];
UILabel *lblDate = [[UILabel alloc] initWithFrame:CGRectMake(240, 0, 70, 40)];
NSDateFormatter *dateFormater = [[NSDateFormatter alloc] init];
[dateFormater setDateFormat:@"yyyy/mm/dd"];
lblDate.text = [NSString stringWithFormat:@"%@",[dateFormater stringFromDate:(NSDate *)db_document.docDate]];
lblDate.textAlignment = UITextAlignmentCenter;
lblDate.textColor = [UIColor blackColor];
lblDate.backgroundColor = [UIColor clearColor];
lblDate.font = [UIFont systemFontOfSize:12];
[cell addSubview:lblDate];
UIButton *btnLine1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btnLine1.frame = CGRectMake(80, 0, 1, 40);
[cell addSubview:btnLine1];
UIButton *btnLine2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btnLine2.frame = CGRectMake(240, 0, 1, 40);
[cell addSubview:btnLine2];
return cell;
}
if (indexPath.section == 1)
{
UILabel *lblMoney = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, 70, 40)];
lblMoney.text = @"";
lblMoney.textAlignment = UITextAlignmentCenter;
lblMoney.textColor = [UIColor blackColor];
lblMoney.backgroundColor = [UIColor clearColor];
lblMoney.font = [UIFont systemFontOfSize:12];
[cell addSubview:lblMoney];
UILabel *lblTotalAmount = [[UILabel alloc] initWithFrame:CGRectMake(165, 0, 140, 40)];
lblTotalAmount.text = @"amounts";
lblTotalAmount.textAlignment = UITextAlignmentCenter;
lblTotalAmount.textColor = [UIColor blackColor];
lblTotalAmount.backgroundColor = [UIColor clearColor];
lblTotalAmount.font = [UIFont systemFontOfSize:12];
[cell addSubview:lblTotalAmount];
UIButton *btnLine = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btnLine.frame = CGRectMake(160, 0, 1, 40);
[cell addSubview:btnLine];
return cell;
}
return cell;
}
- (IBAction)btnAddDocument_click:(id)sender
{
AddDocumentTableView *addDocumentTableView = [[AddDocumentTableView alloc] init];
addDocumentTableView.managedObjectContext = managedObjectContext;
[self.navigationController pushViewController:addDocumentTableView animated:YES];
}
2.这是错误：
2012-06-16 15:25:31.696 Account5[5534:fb03] 2 2012-06-16 15:25:31.704 Account5[5534:fb03] * 由于未捕获的异常“NSRangeException”而终止应用程序，原因：“* -[ _PFArray objectAtIndex:]: index (2) beyond bounds (2)' *** 首先抛出调用栈：
3.让我描述一下程序。我可以使用核心数据将数据保存到数据库，但是当我想获取数据时程序会跳出。我必须考虑到我认为 NSManagedObjectContext 获取了数据，因为 fetchedObjects Array 有 2 个数据，因为我插入了。我不得不说我的RootViewController 是 DocumentTableViewController 这意味着当我运行程序时它会崩溃。如果我想运行该应用程序，我必须发表评论DB_document *db_document = [fetchedObjects objectAtIndex:indexPath.row];
在该应用程序运行后，我可以在另一个页面中插入数据。我必须考虑到当应用程序崩溃时它会完全停止
DB_document *db_document = [fetchedObjects objectAtIndex:indexPath.row];
用绿色突出显示的线。谢谢你