header and footer not fixed in iOS devices

I have make an iOS application using jQuery mobile. But if i click on any input or texarea header bar are not fixed on their position.I am using jQuery version is 2.1.1 and jQuery mobile version is 1.4.5.

Use css like position: fixed or position: absolute and top: 0 they does't properly work on click on any input/textarea in iOS devices.In android they work great.

Also i am develop hybrid app.