在cocoachina上看到iPhone开发中经常用到的控件尺寸大集合这篇文章，因为经常用到这些尺寸，在这里做一下记录。
Element Size (in points)
Window (including status bar) 320 x 480 pts
Status Bar
(How to hide the status bar) 20 pts
View inside window
(visible status bar) 320 x 460
Navigation Bar 44 pts
Nav Bar Image /
Toolbar Image up to 20 x 20 pts (transparent PNG)
Tab Bar 49 pts
Tab Bar Icon up to 30 x 30 pts (transparent PNGs)
Text Field 31 pts
Height of a view inside
a navigation bar 416 pts
Height of a view inside
a tab bar 411 pts
Height of a view inside
a navbar and a tab bar 367 pts
Portrait Keyboard height 216 pts
Landscape Keyboard height 140 pts
