Requirements for Button icons in IOS

After you 've decided on the appearance of your icon, follow these guidelines as you create it:

* Use the PNG format.
* Use white with appropriate Alpha and no shadow.
* Use anti-aliasing.
* For toolbar and navigation bar icons, create an icon that measures about 20x20 pixels.

For tab bar icons, create an icon that measures about 30x30 pixels.

Follow these guidelines when you decide the appearance of your icon to create it for you:

　
* PNG format is used.
* Use white with proper α and no shadow.
* Use anti-sawtooth.
* Create an icon for the toolbar and navigation bar, which is about 20x20 pixels in size.
　　
For the label bar icon, create an icon with a size of about 30 × 30 pixels.