Question

I’m having trouble adding button to my UITableViewCell, the cell has two UILabels and two UIImageViews, sometimes the UIImageView will contain an image and sometimes a button:

In my UITableViewCell subclass I have:

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if ( self ) {
        // Initialization code

    firstLock = [[UILabel alloc]init];
    [firstLock setBackgroundColor:[UIColor clearColor]];
    firstLock.textAlignment = UITextAlignmentLeft;
    firstLock.font = [UIFont fontWithName:@"Arial-BoldMT" size:17];

    secondLock= [[UILabel alloc]init];
    [secondLock setBackgroundColor:[UIColor clearColor]];
    secondLock.textAlignment = UITextAlignmentRight;
    secondLock.font = [UIFont fontWithName:@"Arial-BoldMT" size:17];

    firstLockImage = [[UIImageView alloc]init];

    secondLockImage = [[UIImageView alloc] init];

    [self.contentView addSubview:firstLock];
    [self.contentView addSubview:secondLock];
    [self.contentView addSubview:firstLockImage];
    [self.contentView addSubview:secondLockImage];
    }
    return self;
}

When one of the UIImageViews is just an image no problem, but it crashes when I add a UIButton (imaged) as a subview.

In the UITableViewDataSource implementation:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{



UIImage *btnImage = [UIImage imageNamed:@"bike_ok.png"];

UIButton *button =[UIButton alloc];
[button setImage:btnImage forState:UIControlStateNormal];

[cell.secondLockImage addSubview:button];

Adding a button as a subview of the image view crashes:

 Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Requesting the window of a view (<UIButton: 0x7bac7d0; frame = (0 0; 0 0); transform = [0, 0, 0, 0, 0, 0]; alpha = 0; opaque = NO; userInteractionEnabled = NO; layer = (null)>) with a nil layer. This view probably hasn't received initWithFrame: or initWithCoder:.'
*** First throw call stack:

What am I missing?

Thanks!

Just add! its important this line

    [firstLockImage setUserInteractionEnabled:YES];
    [secondLockImage setUserInteractionEnabled:YES];

Because the UIImageView has NO as default and the button doesn’t work without it!

Answer 1

If you read the crash error it is quite easy to see where your issue is. You have not initialized your button.

UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0,0,0,0)];

or you can use initWithCoder.

Hope this helps

Sam