我想用一个按钮将所有内容保存在 UITableView 控制器中，我不知道该怎么做。我知道它有一种保存方法，但是当您按回应用程序的主屏幕并返回视图控制器时，文本消失了，或者当我删除某些内容时它仍然存在。
我的 .m 文件中的代码
#import "HomeWorkViewController.h"
@interface HomeWorkViewController ()
@end
@implementation HomeWorkViewController
@synthesize adView;
@synthesize myTableView, numbers;
-(void) viewDidLoad
{
adView.delegate=self;
[super viewDidLoad];
self.navigationItem.leftBarButtonItem = self.editButtonItem;
// check here if key exists in the defaults or not, if yes the retrieve results in array
if([[NSUserDefaults standardUserDefaults] objectForKey:@"numberArray"] != nil) {
self.numbers = [NSMutableArray arrayWithArray:[[NSUserDefaults standardUserDefaults] objectForKey:@"numberArray"]];
}
//Register for the notification when user go to background or minimize the app, just save the array objects in the defaults
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(appWillGoToBackground:)
name:UIApplicationWillResignActiveNotification object:[UIApplication sharedApplication]];
//Add the Add button
UIBarButtonItem * addButton = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemAdd
target: self action: @selector(insertNewObject)];
self.navigationItem.rightBarButtonItem = addButton;
}
-(void)setEditing:(BOOL)editing animated:(BOOL)animated {
[super setEditing:editing animated:animated];
[self.myTableView setEditing:editing animated:animated];
}
-(void)appWillGoToBackground:(NSNotification *)note {
NSLog(@"terminate");
NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
[defaults setObject:self.numbers forKey:@"numberArray"];
[defaults synchronize];
}
-(void)insertNewObject{
//Display a UIAlertView
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Enter HomeWork" message: @"" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ok", nil];
alert.alertViewStyle = UIAlertViewStylePlainTextInput;
[alert show];
}
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
//Only perform the following actions if the user hits the ok button
if (buttonIndex == 1)
{
NSString * tmpTextField = [alertView textFieldAtIndex:0].text;
if(!self. numbers){
self.numbers = [[NSMutableArray alloc]init];
}
[self.numbers insertObject:tmpTextField atIndex:0];
NSIndexPath * indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self.myTableView insertRowsAtIndexPaths:@[indexPath]withRowAnimation:UITableViewRowAnimationAutomatic];
}
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return self.numbers.count;
}
-(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];
}
cell.textLabel.text = [self.numbers objectAtIndex:indexPath.row];
return cell;
}
-(BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
return YES;
}
-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete)
{
//remove our NSMutableArray
[self.numbers removeObjectAtIndex:indexPath.row];
//remove from our tableView
[tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
}
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath
toIndexPath:(NSIndexPath *)toIndexPath
{
}
-(void)bannerViewDidLoadAd:(ADBannerView *)banner
{
adView.hidden=FALSE;
NSLog(@"Has ad, showing");
}
-(void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error
{
adView.hidden=TRUE;
NSLog(@"Has no ads, hiding");
}
-(void)dealloc
{
[adView release];
[super dealloc];
}
- (void)viewDidUnload {
[super viewDidUnload];
}
@end