UIButton's titleLabel.text is not displayed on Cocoa Touch

After I create a new UIButton at runtime, and set its titleLabel's text, the button's text is still not displayed.

What am I doing wrong?

-(IBAction) cloneMe: (id) sender{

    if (!currentY) {
        currentY = [sender frame].origin.y;
    }

    UIButton *clone = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    CGRect cloneFrame = [sender frame];
    cloneFrame.origin.y += currentY + cloneFrame.size.height + 30;
    clone.frame = cloneFrame;
    [clone ti开发者_如何学PythontleLabel].text = @"I'm a clone";

    [[sender superview] addSubview:clone];

    currentY = cloneFrame.origin.y + cloneFrame.size.height;


}

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You need:

[clone setTitle:@"I'm a clone" forState:UIControlStateNormal];

Check out the UIControl API docs for other valid values for the forState: argument.

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Use setTitle:forState: to set the title of a button.