Материал взят из http://jdg.net/post/106465937/standard-iphone-element-sizes
Core Elements:
Carrier Status bar - 320x20
UIView - 320x460
UINavigationBar - 320x44
UITabBar - 320x49
UISearchBar - 320x44
UIToolBar - 320x44
Data Input:
UIPickerView - 320x216
UIDatePicker - 320x216
UIKeyboard - 320x216
Buttons:
UISegmentedControl - 320x44
UIButton xx37
Fields:
UITextField - xx37
UISwitch 94x27
UISlider - xx23
Indicators:
UIProgressView -xx9
UIActivityIndicatorView - 37x37
UIPageControl - 38x36