iOS常用控件尺寸大集合

延伸阅读：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.

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