how to remove duplicate button - ios

Question

This is my button creation function.
-(void)buttonCreate {
//oneBtn5 Button
oneBtn5 = [UIButton buttonWithType:UIButtonTypeCustom];
oneBtn5.frame = CGRectMake(316, 389, 51, 21);
oneBtn5.tag = 5;
[oneBtn5 setTitle:#"" forState:UIControlStateNormal];
[oneBtn5 addTarget:self action:#selector(oneButton:) forControlEvents:UIControlEventTouchDown];
[oneBtn5 setImage:[UIImage imageNamed:#"1c.png"] forState:UIControlStateNormal];
[self.view addSubview:oneBtn5];
}
I will show button using viewonload(),
- (void)viewDidLoad {
[super viewDidLoad];
[self buttonCreate];
}
This is my restart function, if i clicked the restart, new button will create.
- (void)RestartAction {
[self buttonCreate];
}
My problem is how to remove duplicate button when i click the restart. It's there any way to solve this problem.

Answer 1

-(void)buttonCreate {
//oneBtn5 Button
if (oneBtn5 != null)
[oneBtn5 removeFromSuperview];
oneBtn5 = [UIButton buttonWithType:UIButtonTypeCustom];
oneBtn5.frame = CGRectMake(316, 389, 51, 21);
oneBtn5.tag = 5;
[oneBtn5 setTitle:#"" forState:UIControlStateNormal];
[oneBtn5 addTarget:self action:#selector(oneButton:) forControlEvents:UIControlEventTouchDown];
[oneBtn5 setImage:[UIImage imageNamed:#"1c.png"] forState:UIControlStateNormal];
[self.view addSubview:oneBtn5];
}

Answer 2

Just remove the button from it's superview:
-(void)buttonCreate {
if (oneBtn5.superView) {
[oneBtn5 removeFromSuperview];
}
....
}

Answer 3

you could do this in buttonCreate
if(oneBtn5==nil)
{
oneBtn5 = [UIButton buttonWith....];
[self.view addsubview: oneBtn5;
}
button only inits and adds once

Answer 4

Use this as :
-(void)buttonCreate {
if ([self.view.subviews containsObject:oneBtn5]) {
[oneBtn5 removeFromSuperview];
}
// YOUR CODE HERE
}

Answer 5

If it is a property, as people tell you, check if it exists previously.
if(!self.oneBtn5){
//instance of button
self.oneBtn5 = [UIButton buttonWith....];
[self.view addsubview: self.oneBtn5];
}else{
//change stuff you need like text or frame
}
The problem is that you are creating new instances of the button instead of reusing the previous one.

Answer 6

-(void)buttonCreate {
//oneBtn5 Button
if (oneBtn5 ){
[oneBtn5 removeFromSuperview];
oneBtn5=nil; // release the memory
}
oneBtn5 = [UIButton buttonWithType:UIButtonTypeCustom];
oneBtn5.frame = CGRectMake(316, 389, 51, 21);
oneBtn5.tag = 5;
[oneBtn5 setTitle:#"" forState:UIControlStateNormal];
[oneBtn5 addTarget:self action:#selector(oneButton:) forControlEvents:UIControlEventTouchDown];
[oneBtn5 setImage:[UIImage imageNamed:#"1c.png"] forState:UIControlStateNormal];
[self.view addSubview:oneBtn5];
}
You must write oneBtn = nil after [oneBtn5 removeFromSuperview] to release the memory for the previously created button. As [oneBtn5 removeFromSuperview]; remove the button from its superview but does not release memory.You must release the memory by setting it to nil.