calling the ibaction method programmatically is not changing the background of the button?

Question

I had an application in which I am adding some dynamic number of buttons to a scrollview. I had set a normal background and selected background for the UIButton . For some reasons I need to call the UIButton sender method programmatically by:

[self buttontapped:nil];

as this but it is not changing the background of the button by using the code:

button.selected = YES;

I had set the background like this initially of the button:

    btn = [UIButton buttonWithType:UIButtonTypeCustom];
    int j = i+1;
    btn.frame = CGRectMake((j-1)*77, 0, 77, 44);
    [btn setBackgroundImage:[UIImage imageNamed:@"bar.png"] forState:UIControlStateNormal];
    [btn setBackgroundImage:[UIImage imageNamed:@"bar_hvr.png"] forState:UIControlStateSelected];
    btn.selected = NO;
    btn.backgroundColor = [UIColor clearColor];
    btn.titleLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size:14];
    btn.titleLabel.textColor = [UIColor whiteColor];

    [btn setTitle:head forState:UIControlStateNormal];
    btn.tag = i;
    [tabBarS addSubview:btn];

-(void)buttonTapped:(id)sender {
    if(sender==nil)
    {
        btn.tag=0;
    }

    for(int i=0;i<[sarray count];i++)
    {
           btn.selected=NO;  
     }
    btn = (UIButton *)sender;
    NSLog(@"Tab bar %d is clicked",btn.tag);
    [self tabCall:btn.tag];
    btn.selected = YES; 
}

But everything except change of background only working. Where am I going wrong?

Answer 1

i done with bellow method call your UIButton method like:-

btn= [UIButton buttonWithType:UIButtonTypeCustom];
    int j=i+1;
    btn.frame = CGRectMake((j-1)*77, 0, 77, 44);
    [btn setBackgroundImage:[UIImage imageNamed:@"bar.png"] forState:UIControlStateNormal];
    [btn setBackgroundImage:[UIImage imageNamed:@"bar_hvr.png"] forState:UIControlStateSelected];
    btn.selected=NO;
    [btn addTarget:self action:@selector(yourButtonAction:) forControlEvents:UIControlEventTouchUpInside];
    btn.backgroundColor = [UIColor clearColor];
    btn.titleLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size:14];
    btn.titleLabel.textColor = [UIColor whiteColor];


    btn.tag = i;
    [tabBarS addSubview:btn];

and it's Action Method should like with sender

-(IBAction)yourButtonAction:(id)sender
{
    UIButton *btn = (UIButton*)sender;

    if (![btn isSelected])
    {
        [btn setImage:[UIImage imageNamed:@"selected_fb_btn.png"] forState:UIControlStateNormal];
        [btn setSelected:YES];

        [self login];
    }
    else{
        [btn setImage:[UIImage imageNamed:@"facebook.png"] forState:UIControlStateNormal];
        [btn setSelected:NO];

    }

}

EDIT

You can call button action event programeticuly using bellow trik:-

[btn sendActionsForControlEvents:UIControlEventTouchUpInside];

Answer 2

write this bellow line first and also change the method type from void to IBAction ...

btn = (UIButton *)sender;

like bellow...

-(IBAction)buttonTapped:(id)sender {

    btn = (UIButton *)sender;
    if(sender==nil)
    {
     btn.tag=0;
    }

    for(int i=0;i<[sarray count];i++)
    {
       [btn setSelected:NO];
     }
    NSLog(@"Tab bar %d is clicked",btn.tag);
    [self tabCall:btn.tag];
    [btn setSelected:YES];
}

Answer 3

You need to set image property rather than backgroundImage property of UIButton . Use default Image property and selected property.

[btn setSelected:TRUE];

Answer 4

is the log that you are printing, prints the button.tag correctly?

NSLog(@"Tab bar %d is clicked",btn.tag);

Answer 5

In your button action

   btn.selected=YES;

in last line makes the button in selected state always

also get the correct instance as

btn=(UIButton *)sender;