How to change image set on Button

I wan开发者_运维问答t to change the button image on buttons click event. Here is what i am trying.

-(IBAction)editObjectImage:(id)sender
{
    if (editButtonState == NO)
    {   
        [editButton setImage:nil forState:UIControlStateNormal];
        [editButton setImage:[UIImage imageNamed:@"done2.png"] forState:UIControlStateNormal];
    }
    else
    {
        [editButton setImage:nil forState:UIControlStateNormal];
        [editButton setImage:[UIImage imageNamed:@"edit.png"] forState:UIControlStateNormal];
    }
}

But my Button image is not changing. What's wrong with code?

I think you aren't getting round to changing editButtonState. Your code can be reduced to.

-(IBAction)editObjectImage:(id)sender
{
    UIButton *theButton = (UIButton*)sender;
    if (editButtonState == NO) {   
        [theButton setImage:[UIImage imageNamed:@"done2.png"] forState:UIControlStateNormal];
    } else {
        [theButton setImage:[UIImage imageNamed:@"edit.png"] forState:UIControlStateNormal];
    }

    editButtonState = !editButtonState;
}

This is my working code:

NSString *shoppingListButtonImageName = @"notepad-selected";

UIImage *slImage = [UIImage imageNamed:shoppingListButtonImageName];
//put a breakpoint here to check that slImage is not nil.

[self.shoppingListButton setImage:slImage forState:UIControlStateNormal];

On button click you have to set image like this;

[editButton setImage:[UIImage imageNamed:@"image.png"] forState:UIControlStateHighlighted];

Check if the images are added properly (your [UIImage imageNamed:@""]) is not returning nil ? , otherwise it should work properly.