Cannot remove dynamic UIButton - objective-c

Question

The UIButton is created under #implementation . I have to remove it after some functions but[button removeFromSuperview] doesn't work. How can I remove that?
#import "TabBar.h"
#import "CustomCell.h"
#interface TabBar ()
#end
#implementation TabBar
UILabel *title;
NSString *par;
UIButton *button;
NSMutableArray *backlist;
- (NSString *)documentsDirectory {
return [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES) lastObject];
}
-(void)tbl_info{
NSString *path = [[self documentsDirectory] stringByAppendingPathComponent:#"icd10.plist"];
self.dataList = [[NSMutableArray alloc] initWithContentsOfFile:path];
for (NSInteger i=[self.dataList count]-1; i>=0;i--) {
NSDictionary *d = [self.dataList objectAtIndex:i];
par=[d objectForKey:#"PARENTID"];
if(![par isEqualToString:self.val])
[self.dataList removeObjectAtIndex:i];
}
}
- (IBAction)ara:(id)sender{
[self tbl_info];
[self.tViewTab reloadData];
}
- (NSInteger)tableView:(UITableView *)tableView
numberOfRowsInSection:(NSInteger)section
{
return [self.dataList count];
}
- (CGFloat)tableView:(UITableView *)tableView
heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *name= [[self.dataList objectAtIndex:indexPath.row] objectForKey:#"NAME"];
CGSize maxSize = CGSizeMake(320/2, MAXFLOAT);
CGSize labelSize = [name sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:maxSize lineBreakMode:NSLineBreakByWordWrapping];
if(labelSize.height>=63)
labelSize.height=63;
return labelSize.height+1;
}
- (UITableViewCell*)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellID = #"cellid";
CustomCell *cell = (CustomCell*)[tableView dequeueReusableCellWithIdentifier:cellID];
if (cell == nil)
{
cell = (CustomCell*)[[[NSBundle mainBundle]
loadNibNamed:#"CustomCell" owner:nil options:nil]
lastObject];
}
NSDictionary *d = [self.dataList objectAtIndex:indexPath.row];
cell.nameLabel.text = [d objectForKey:#"NAME"];
cell.cityLabel.text = [d objectForKey:#"CODE"];
cell.indexPath = indexPath;
CGSize maxSize = CGSizeMake(320/2, MAXFLOAT);
CGSize nameSize = [cell.nameLabel.text sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:maxSize lineBreakMode:NSLineBreakByWordWrapping];
if(nameSize.height>=63)
nameSize.height=63;
cell.nameLabel.frame =CGRectMake(80, 0, 234, nameSize.height);
cell.cityLabel.text = [d objectForKey:#"CODE"];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSDictionary *d = [self.dataList objectAtIndex:indexPath.row];
NSMutableDictionary *backprop = [[NSMutableDictionary alloc] init];
[backprop setObject:self.val forKey:#"id"];
[backprop setObject:title.text forKey:#"name"];
[backlist addObject:backprop];
//back button
button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self action:#selector(touchEvent:) forControlEvents:UIControlEventTouchUpInside];
[button setTitle:title.text forState:UIControlStateNormal];
button.frame = CGRectMake(02.0, 02.0, 71, 32);
[self.view addSubview:button];
//parent and title label
[title setText:[d objectForKey:#"NAME"]];
self.val=[d objectForKey:#"ID"];
[self tbl_info];
[self.tViewTab reloadData];
}
-(void)touchEvent:(id)sender{
[title setText:[[backlist objectAtIndex:backlist.count-1] objectForKey:#"name" ]];
self.val= [[backlist objectAtIndex:backlist.count-1] objectForKey:#"id"];
[backlist removeObjectAtIndex:backlist.count-1];
if(backlist.count>0)
[button setTitle:[[backlist objectAtIndex:backlist.count-1] objectForKey:#"name" ] forState:UIControlStateNormal];
else
[button removeFromSuperview];
[self tbl_info];
[self.tViewTab reloadData];
}
- (void)viewDidLoad
{
[super viewDidLoad];
backlist =[[NSMutableArray alloc]init];
self.val=#"0";
[self tbl_info];
[self.tViewTab reloadData];
title =[[UILabel alloc]initWithFrame:CGRectMake(79.0, 07.0, 162, 21)];
title.text = #"ICD10 Kod Grupları"; //etc...
[self.view addSubview:title];
[title release];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}

Answer 1

In place of this :
button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self action:#selector(touchEvent:) forControlEvents:UIControlEventTouchUpInside];
[button setTitle:title.text forState:UIControlStateNormal];
button.frame = CGRectMake(02.0, 02.0, 71, 32);
[self.view addSubview:button];
Try this :
if (button != nil) {
button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self action:#selector(touchEvent:) forControlEvents:UIControlEventTouchUpInside];
[button setTitle:title.text forState:UIControlStateNormal];
button.frame = CGRectMake(02.0, 02.0, 71, 32);
[self.view addSubview:button];
}
Or try this :
if (button != nil) {
[button removeFromSuperView];
[button release]; // dont write this in case of ARC
button = nil;
}
button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self action:#selector(touchEvent:) forControlEvents:UIControlEventTouchUpInside];
[button setTitle:title.text forState:UIControlStateNormal];
button.frame = CGRectMake(02.0, 02.0, 71, 32);
[self.view addSubview:button];

Answer 2

Not a solution but a workaround:
Use
[sender removeFromSuperview];
or respectively, because sender is of type id and not UIView*:
[(UIButton*)sender removeFromSuperview];
But you could change sender to UIView* savely.
-(void)touchEvent:(UIView *)sender{
Some even put UIButton* in there. I personally don't like that but it is quite save if you know for sure that the message is sent by UIButtons only.
Another workaround would be to set the .tag property of the button and then fetch the real buttom from self.view by its tag.