Using Push Buttons
A push button performs the action described by the button’s name. Generally, it’s a rounded rectangle that contains its name inside. For example, this button might appear in a dialog box that finds text in a document:
It’s easiest to create a push button in Interface Builder. You can also create one programmatically by creating an NSButton instance with a type of NSMomentaryPushInButton, an image position of NSNoImage, and a border of NSRoundedBezelStyle.
You can also have a push button that’s an icon button; that is, one that’s primarily identified by its icon and has little or no text. It’s rectangular, like this:
You can create an icon push button in either Interface Builder or programmatically. If you use Interface Builder, start with a regular push button. If you create it programmatically, create an NSButton instance, then set its type to NSMomentaryPushInButton, its image position to NSImageOnly, its bezel type to a square bezel type. Finally, set the image to what you want.
Note: A text button can have a small image on it, and an icon button can have a label. The important issue is what’s most prominent. If it’s the text, treat it as a text button. If it’s the image, treat it as an icon button.
You can also have a push button that toggles between two states, with each state having its own title and image. For example, a button could toggle between Start and Stop. You can create one in the same way you create a regular push button with either Interface Builder or programmatically. Just change the button type to NSToggleButton. Then give the button an alternate title and image as well as a regular title and image. The button displays the regular title and image at first, then displays the alternate title and image after the user clicks it.
Last updated: 2007-12-11
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