在我的申请中
它有tableview ...有两行。
当选择日期...我加载了运行良好且良好的EventViewController视图...
当回到我的tableview并选择City时，我的应用程序崩溃了
我在控制台中看不到任何东西。它没有显示任何信息。
怎么做......
这是代码......
The For implementation ......
但是我的应用程序崩溃了......
#import "SearchViewController.h"
#import "SearchDetailViewController.h"
#import "EventViewController.h"
@implementation SearchViewController
@synthesize searchListArray;
/*
// The designated initializer. Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {
// Custom initialization
}
return self;
}
*/
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
UIBarButtonItem *barButton=[[UIBarButtonItem alloc]initWithTitle:@"Back" style:UIBarButtonItemStylePlain target:nil action:nil];
self.navigationItem.backBarButtonItem=barButton;
[barButton release];
searchListArray =[[NSMutableArray alloc]init];
[searchListArray addObject:@"City"];
[searchListArray addObject:@"Populair"];
[searchListArray addObject:@"Date"];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
return [searchListArray count];
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
cell.selectionStyle= UITableViewCellSelectionStyleBlue;
// cell.accessoryType=UITableViewCellAccessoryDisclosureIndicator;
cell.backgroundColor=[UIColor blueColor];
cell.textLabel.text=[searchListArray objectAtIndex:indexPath.row];
switch (indexPath.row) {
case 0:
cell.accessoryType=UITableViewCellAccessoryDisclosureIndicator;
break;
case 2:
cell.accessoryType=UITableViewCellAccessoryDisclosureIndicator;
break;
default:
break;
}
}
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
switch (indexPath.row) {
case 0:
NSLog(@"searchdetailedview");
SearchDetailViewController *searchDetailViewController = [[SearchDetailViewController alloc] initWithNibName:@"SearchDetailViewController" bundle:nil];
[self.navigationController pushViewController:searchDetailViewController animated:YES];
// self.navigationItem.title = @"Back";
[searchDetailViewController release];
searchDetailViewController=nil;
break;
case 2:
NSLog(@"eventviewController");
EventViewController *eventViewController=[[EventViewController alloc]initWithNibName:@"EventViewController" bundle:nil];
[self.navigationController pushViewController:eventViewController animated:YES];
[eventViewController release];
eventViewController=nil;
break;
default:
break;
}
}
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (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.
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[searchListArray release];
[super dealloc];
}
EventViewController
#import "EventViewController.h"
@implementation EventViewController
@synthesize eventsList;
@synthesize eventStore;
@synthesize defaultCalendar;
@synthesize detailViewController;
#pragma mark -
#pragma mark View lifecycle
- (void)viewDidLoad {
[super viewDidLoad];
self.title=@"Event List";
self.eventStore=[[EKEventStore alloc]init];
self.eventsList=[[NSMutableArray alloc]initWithArray:0];
self.defaultCalendar=[self.eventStore defaultCalendarForNewEvents];
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
UIBarButtonItem *addButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:
UIBarButtonSystemItemAdd target:self action:@selector(addEvent:)];
self.navigationItem.rightBarButtonItem = addButtonItem;
[addButtonItem release];
self.navigationController.delegate = self;
[self.eventsList addObjectsFromArray:[self fetchEventsForToday]];
[self.tableView reloadData];
}
- (IBAction) addEvent:(id)sender{
EKEventEditViewController *addController = [[EKEventEditViewController alloc] initWithNibName:nil bundle:nil];
// set the addController's event store to the current event store.
addController.eventStore = self.eventStore;
// present EventsAddViewController as a modal view controller
[self presentModalViewController:addController animated:YES];
addController.editViewDelegate = self;
[addController release];
}
- (NSArray *) fetchEventsForToday{
NSDate *startDate = [NSDate date];
// endDate is 1 day = 60*60*24 seconds = 86400 seconds from startDate
NSDate *endDate = [NSDate dateWithTimeIntervalSinceNow:86400];
// Create the predicate. Pass it the default calendar.
NSArray *calendarArray = [NSArray arrayWithObject:defaultCalendar];
NSPredicate *predicate = [self.eventStore predicateForEventsWithStartDate:startDate endDate:endDate
calendars:calendarArray];
// Fetch all events that match the predicate.
NSArray *events = [self.eventStore eventsMatchingPredicate:predicate];
return events;
}
- (void)viewWillAppear:(BOOL)animated {
// [super viewWillAppear:animated];
[self.tableView deselectRowAtIndexPath:self.tableView.indexPathForSelectedRow animated:NO];
}
/*
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
}
*/
/*
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
}
*/
/*
- (void)viewDidDisappear:(BOOL)animated {
[super viewDidDisappear:animated];
}
*/
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#pragma mark -
#pragma mark Table view data source
//- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// // Return the number of sections.
// // return <#number of sections#>;
//}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
return [eventsList count];
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCellAccessoryType editableCellAccessoryType =UITableViewCellAccessoryDisclosureIndicator;
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
cell.accessoryType=editableCellAccessoryType;
cell.textLabel.text=[[self.eventsList objectAtIndex:indexPath.row]title];
// Configure the cell...
return cell;
}
/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the specified item to be editable.
return YES;
}
*/
/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
*/
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
#pragma mark -
#pragma mark Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// Navigation logic may go here. Create and push another view controller.
// Upon selecting an event, create an EKEventViewController to display the event.
self.detailViewController = [[EKEventViewController alloc] initWithNibName:nil bundle:nil];
detailViewController.event = [self.eventsList objectAtIndex:indexPath.row];
// Allow event editing.
detailViewController.allowsEditing = YES;
// Push detailViewController onto the navigation controller stack
// If the underlying event gets deleted, detailViewController will remove itself from
// the stack and clear its event property.
[self.navigationController pushViewController:detailViewController animated:YES];
}
#pragma mark -
#pragma mark Navigation Controller delegate
- (void)navigationController:(UINavigationController *)navigationController
willShowViewController:(UIViewController *)viewController animated:(BOOL)animated{
if (viewController == self && self.detailViewController.event.title == NULL) {
[self.eventsList removeObject:self.detailViewController.event];
[self.tableView reloadData];
}
}
- (void)eventEditViewController:(EKEventEditViewController *)controller
didCompleteWithAction:(EKEventEditViewAction)action{
NSError *error=nil;
EKEvent *thisEvent=controller.event;
switch (action) {
case EKEventEditViewActionCanceled:
break;
case EKEventEditViewActionSaved:
if (self.defaultCalendar ==thisEvent.calendar) {
[self.eventsList addObject:thisEvent];
}
[controller.eventStore saveEvent:controller.event span:EKSpanThisEvent error:&error];
[self.tableView reloadData];
break;
case EKEventEditViewActionDeleted:
if (self.defaultCalendar == thisEvent.calendar) {
[self.eventsList removeObject:thisEvent];
}
[controller.eventStore removeEvent:thisEvent span:EKSpanThisEvent error:&error];
[self.tableView reloadData];
break;
default:
break;
}
[controller dismissModalViewControllerAnimated:YES];
}
- (EKCalendar *)eventEditViewControllerDefaultCalendarForNewEvents:(EKEventEditViewController *)controller{
EKCalendar *calendarForEdit=self.defaultCalendar;
return calendarForEdit;
}
#pragma mark -
#pragma mark Memory management
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Relinquish ownership any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
// For example: self.myOutlet = nil;
self.eventsList = nil;
[self.detailViewController release];
}
- (void)dealloc {
[super dealloc];
}
这就是我所做的......帮助我。
@thanks提前。
答案 0 :(得分：1)
请执行以下步骤：
1）按Build和Debug（Build - ＆gt; Build and Debug - Breakpoints on） 2）打开调试器 3）创建崩溃 4）现在，转到调试器并在左侧搜索黑色项目 5）按此项，您将找到应用程序崩溃的位置
如果您已经这样做了，请写下您的应用程序崩溃的位置 - 这将更容易。也许，你会发现错误。
答案 1 :(得分：1)
我认为你的问题可能是self.navigationController.delegate = self; - [EventViewController viewDidLoad]。当你点击后退按钮时，EventViewController被释放，但是navigationController仍然认为它是它的委托。因此，当它询问是否可以打开下一个视图控制器时，它会调用已释放对象上的方法并导致崩溃。