学步园

Sizes of iPhone UI
Elements

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

Points vs. Pixels

The iPhone 4 introduced a high resolution display with twice the pixels of previous iPhones. However you don't have to modify your code to
support high-res displays; the coordinate system goes by points rather than pixels, and the dimensions in points of the screen and all UI elements remain the same.
iOS 4 supports high resolution displays (like the iPhone 4 display) via
the scale property on UIScreen,
UIView, UIImage, and CALayer classes. If the object is displaying high-res content, its scale property is set to 2.0. Otherwise it defaults to 1.0.

All you need to do to support high-res displays is to provide @2x versions of the images in your project. See the checklist
for updating to iOS4 or Apple documentation for Supporting
High Resolution Screens for more info.
Adjusting Sizes

Click here to see how to adjust View
Frames and Bounds.
Additional References

• Apple Documentation: Points
  vs. Pixels
• Apple Documentation: UIBarButtonItem
  Class Reference says "Typically, the size of a toolbar and navigation bar image is 20 x 20 points."
• Apple Documentation: UITabBarItem
  Class Reference says "The size of an tab bar image is typically 30 x 30 points."

转自：http://www.cocoachina.com/bbs/read.php?tid=59387