Ios 如何从同一单元格中删除UITableViewCell?

Ios 如何从同一单元格中删除UITableViewCell?,ios,objective-c,uitableview,uibutton,Ios,Objective C,Uitableview,Uibutton,我有一个带有自定义表视图单元格的UITableView 该单元格有一个自定义的删除按钮。按钮操作在cell类中 从db中删除行后,无法从cell类重新加载表。如果我试图从cell.superview或cell.superview.superview获取表视图,应用程序将崩溃 这是单元实现 @implementation pixSavedTableViewCell - (IBAction)deleteBusiness:(id)sender { NSLog(@"DELETING BUSIN

我有一个带有自定义表视图单元格的
UITableView

该单元格有一个自定义的删除按钮。按钮操作在cell类中

从db中删除行后,无法从cell类重新加载表。如果我试图从
cell.superview
cell.superview.superview
获取表视图,应用程序将崩溃

这是单元实现

@implementation pixSavedTableViewCell

- (IBAction)deleteBusiness:(id)sender {
    NSLog(@"DELETING BUSINESS cell");
    self.hidden=YES;
    pixDBManager *dbConnection = [[pixDBManager alloc]init];
    dbConnection.businessName = self.nameLable.text;
    [dbConnection deleteBusiness];
    //[(UITableView *)self.superview.superview reloadData];
}
@end
@implementation pixSavedViewController
{
    NSMutableArray *businessArray;
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    pixDBManager *dbConnection = [[pixDBManager alloc]init];
    businessArray = [[NSMutableArray alloc]init];
    [dbConnection createOrOpenDB];
    businessArray = [dbConnection getSavedBusiness];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return businessArray.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath      *)indexPath
{
    static NSString *customcellidentifier = @"CustomCell3";

    pixSavedTableViewCell *cell = (pixSavedTableViewCell *)[tableView   dequeueReusableCellWithIdentifier:customcellidentifier];

    if (cell == nil) {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"Savedcell" owner:self options:nil];
        cell = [nib objectAtIndex:0];

    }
    pixBusinessDetails *details = [[pixBusinessDetails alloc]init];
    details = [businessArray objectAtIndex:indexPath.row];
    cell.nameLable.text = details.name;
    cell.addressLable.text = details.address;
    cell.descriptionLable.text = details.description;
    cell.scoreLable.text = details.score;
    cell.votesLable.text = details.votes;
    NSLog(@"Business Detail %@\n %@\n %@\n %@\n %@\n %@\n",details.name, details.address,details.description,details.score,details.votes,details.imageId);

    return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{     
    return 130;
}
这将从中删除数据

-(void)deleteBusiness
{
    NSLog(@"DELETING BUSINESS");
    char *error;
    if(sqlite3_open([dbPathString UTF8String], &businessDB)==SQLITE_OK){
        NSString *deleteStatement = [NSString stringWithFormat:@"DELETE FROM SAVEDBUSINESS      WHERE 'NAME'='%@'",_businessName];
        const char *delete_stmt = [deleteStatement UTF8String];
        NSLog(@"%s",delete_stmt);
        if (sqlite3_exec(businessDB, delete_stmt, NULL, NULL, &error)==SQLITE_OK) {
            NSLog(@"Business Deleted");

        }
        else{
            NSLog(@"Cant Delete Data");
        }
        sqlite3_close(businessDB);
    }
    else{
        NSLog(@"Cant Open Data Base");
    }
}
这是我的视图控制器实现

@implementation pixSavedTableViewCell

- (IBAction)deleteBusiness:(id)sender {
    NSLog(@"DELETING BUSINESS cell");
    self.hidden=YES;
    pixDBManager *dbConnection = [[pixDBManager alloc]init];
    dbConnection.businessName = self.nameLable.text;
    [dbConnection deleteBusiness];
    //[(UITableView *)self.superview.superview reloadData];
}
@end
@implementation pixSavedViewController
{
    NSMutableArray *businessArray;
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    pixDBManager *dbConnection = [[pixDBManager alloc]init];
    businessArray = [[NSMutableArray alloc]init];
    [dbConnection createOrOpenDB];
    businessArray = [dbConnection getSavedBusiness];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return businessArray.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath      *)indexPath
{
    static NSString *customcellidentifier = @"CustomCell3";

    pixSavedTableViewCell *cell = (pixSavedTableViewCell *)[tableView   dequeueReusableCellWithIdentifier:customcellidentifier];

    if (cell == nil) {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"Savedcell" owner:self options:nil];
        cell = [nib objectAtIndex:0];

    }
    pixBusinessDetails *details = [[pixBusinessDetails alloc]init];
    details = [businessArray objectAtIndex:indexPath.row];
    cell.nameLable.text = details.name;
    cell.addressLable.text = details.address;
    cell.descriptionLable.text = details.description;
    cell.scoreLable.text = details.score;
    cell.votesLable.text = details.votes;
    NSLog(@"Business Detail %@\n %@\n %@\n %@\n %@\n %@\n",details.name, details.address,details.description,details.score,details.votes,details.imageId);

    return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{     
    return 130;
}

与其从
UITableViewCell
中删除数据,不如调用
UIViewController
中的方法,该方法将删除数据,然后重新加载表

这样做的一个方法是为UIViewController创建一个协议,以符合:

@protocol pixSavedTableViewCellDelegate
- (void)deleteBuisness:(NSString *) businessName
@end

@interface pixSavedTableViewCell : UITableViewCell
@property (nonatomic, weak) id<pixSavedTableViewCellDelegate> delegate;
@end
然后在
UIViewController
中实现协议:

@interface pixSavedViewController <pixSavedTableViewCellDelegate>
@end

@implementation pixSavedViewController
#pragma mark - pixSavedTableViewCellDelegate
- (void)deleteBuisness:(NSString *) businessName
{
    pixDBManager *dbConnection = [[pixDBManager alloc]init];
    dbConnection.businessName = businessName;
    [dbConnection deleteBusiness];

    [self.tableView reloadData];
}

与其从
UITableViewCell
中删除数据,不如调用
UIViewController
中的方法,该方法将删除数据,然后重新加载表

这样做的一个方法是为UIViewController创建一个协议,以符合:

@protocol pixSavedTableViewCellDelegate
- (void)deleteBuisness:(NSString *) businessName
@end

@interface pixSavedTableViewCell : UITableViewCell
@property (nonatomic, weak) id<pixSavedTableViewCellDelegate> delegate;
@end
然后在
UIViewController
中实现协议:

@interface pixSavedViewController <pixSavedTableViewCellDelegate>
@end

@implementation pixSavedViewController
#pragma mark - pixSavedTableViewCellDelegate
- (void)deleteBuisness:(NSString *) businessName
{
    pixDBManager *dbConnection = [[pixDBManager alloc]init];
    dbConnection.businessName = businessName;
    [dbConnection deleteBusiness];

    [self.tableView reloadData];
}

在我看来,这就是委托模式的作用:

使您的
UITableViewController
成为自定义单元格的代理

MyCustomCell *cell = ....
cell.deleteDelegate = self

//in your UITableViewController
- (void)willDeleteCustomCell:(MyCustomCell*)cell
{

}

//on your cell
- (IBAction)deleteBusiness:(id)sender
{
     [self.deleteDelegate willDeleteCustomCell:self];

     //rest of your delete code
}

在我看来,这就是委托模式的作用:

使您的
UITableViewController
成为自定义单元格的代理

MyCustomCell *cell = ....
cell.deleteDelegate = self

//in your UITableViewController
- (void)willDeleteCustomCell:(MyCustomCell*)cell
{

}

//on your cell
- (IBAction)deleteBusiness:(id)sender
{
     [self.deleteDelegate willDeleteCustomCell:self];

     //rest of your delete code
}


我认为你的问题在于你试图获得superview的方式。不能假设单元格超级视图是tableview。相反,您需要遍历层次结构,直到找到它为止。请参阅此答案以获取帮助。如果你有问题,我会问你,而不是仅仅发布代码并告诉我们它有什么问题。你试图做的是自杀,假装在你死后收拾残局。我认为你的问题是你试图获得superview的方式。不能假设单元格超级视图是tableview。相反,您需要遍历层次结构,直到找到它为止。请参阅此答案以获取帮助。如果你有问题,我会问你,而不是仅仅发布代码并告诉我们它有什么问题。你试图做的是自杀,并假装在你死后收拾残局。好的一个-(iAction)deleteBusiness:(id)发送方{NSLog(@“Deleting”);[self.deleteBusness:self.nameLable.text];}@end此函数未执行……是否设置了委托?在方法中设置断点,并确保self.delegate不为零。我猜您也对UIViewController进行了所有更改?很抱歉,我弄错了,它执行到[dbConnection deleteBusiness];但是没有工作[self.tableView重新加载数据];好办法。好的一个-(iAction)deleteBusiness:(id)发送方{NSLog(@“Deleting”);[self.deleteBusness:self.nameLable.text];}@end此函数未执行……是否设置了委托?在方法中设置断点,并确保self.delegate不为零。我猜您也对UIViewController进行了所有更改?很抱歉,我弄错了,它执行到[dbConnection deleteBusiness];但是没有工作[self.tableView重新加载数据];我这样做了,但是-(iAction)deleteBusiness:(id)sender此函数未执行…我假设此方法已在您的项目中正确连接。你做了什么使它停止工作?是的,此方法连接正确。。。我将NSLog添加到该方法中。我运行了应用程序。它没有执行NSlog。当我删除[self.deleteDelegate willDeleteCustomCell:self]方法时,它执行了NSlog..我不明白。如果在
[self.deleteDelegate willDeleteCustomCell:self]
行之后添加
NSLog
,并且
NSLog
未执行,那么我假设您的应用程序一定会崩溃?简单地在方法中存在一行不会阻止该方法被执行。这确实发生了…我在[self.deleteDelegate willDeleteCustomCell:self]之前添加了NSLog,并且简单地在方法中存在一行确实阻止了该方法被执行我这样做了,但是-(iAction)deleteBusiness:(id)发件人此函数未执行…我假设此方法已在您的项目中正确连接。你做了什么使它停止工作?是的,此方法连接正确。。。我将NSLog添加到该方法中。我运行了应用程序。它没有执行NSlog。当我删除[self.deleteDelegate willDeleteCustomCell:self]方法时,它执行了NSlog..我不明白。如果在
[self.deleteDelegate willDeleteCustomCell:self]
行之后添加
NSLog
,并且
NSLog
未执行,那么我假设您的应用程序一定会崩溃?简单地在方法中存在一行并不会阻止该方法的执行。这确实发生了……我在[self.deleteDelegate willDeleteCustomCell:self]之前添加了NSLog,而简单地在方法中存在一行确实阻止了该方法的执行