Question

How can I make the background color of a UITextField blink?

Answer 1

Create a function that toggles the the background color.

-(void) flashBackground {   UIColor* color = _flashOn ? [UIColor colorRed] : [UIColor colorWhite];   _textField.backgroundColor = color;   [_textField setNeedsDisplay];   _flashOn = !_flashOn;  } 

Then setup a timer to call this function

[NSTimer scheduledTimerWithTimeInterval:0.1f target:self selector:@selector(flashBackground) userInfo: nil repeats: NO];