Placeholder strange behavior on input

I'm programming an application for iPhone. My application has a login system. In the login system (and somewhere around my app) I have some placeholder in the UITextFields.

After a couple of months working on this app, I noticed a sudden problem that arose once. If I don't write in the text fields that have placeholders nothing happens, if I write something in them, the blue bar that blinks showing where you are in the text becomes very slow. Moreover the ScrollViews that I have become EXTREMELY slow. Some other strange behavior happens when I have a wheel that lets th开发者_如何学Ce user pick some choice: the options of the wheel "fall" from the sky while the user rolls it.

All of this happens only if I write something in a UITextField that has some placeholder. If not, nothing of this happens.

I know this sounds REALLY strange, I used a MacOSX program to create a video of the text field becoming slow.

It's .swf.

try to do one thing.. delete this textfiled and create a new one with different name and see is this problem occurring again? also try to set breakpoints in your code and debug your code.

Are you sure you aren't leaking any memory or running an endless loop on the cpu? Try monitoring your app with Instruments and check your cpu activity and memory allocations.