Button Utilities

Functions
void	NIApplyImageSelectorToButton (SEL selector, id target, UIButton *button)
void	NIApplyBackgroundImageSelectorToButton (SEL selector, id target, UIButton *button)
void	NIApplyTitleColorSelectorToButton (SEL selector, id target, UIButton *button)

Overview

For manipulating UIButton objects.

The methods provided here make it possible to specify different properties for different button states in a scalable way. For example, you can define a stylesheet class that has a number of class methods that return the various properties for buttons.

@implementation Stylesheet

+ (UIImage *)backgroundImageForButtonWithState:(UIControlState)state {
  if (state & UIControlStateHighlighted) {
    return [UIImage imageNamed:@"button_highlighted"];

  } else if (state == UIControlStateNormal) {
    return [UIImage imageNamed:@"button"];
  }
  return nil;
}

@end

// The result of the implementation above will set the background images for the button's
// highlighted and default states.
NIApplyBackgroundImageSelectorToButton(@selector(backgroundImageForButtonWithState:),
                                       [Stylesheet class],
                                       button);

Function Documentation

NIApplyImageSelectorToButton

Sets the images for a button's states.

void NIApplyImageSelectorToButton;

Discussion

Parameters

selector	A selector of the form: (UIImage *)imageWithControlState:(UIControlState)controlState
target	The target upon which the selector will be invoked.
button	The button object whose properties should be modified.

NIApplyBackgroundImageSelectorToButton

Sets the background images for a button's states.

void NIApplyBackgroundImageSelectorToButton;

Discussion

Parameters

selector	A selector of the form: (UIImage *)backgroundImageWithControlState:(UIControlState)controlState
target	The target upon which the selector will be invoked.
button	The button object whose properties should be modified.

NIApplyTitleColorSelectorToButton

Sets the title colors for a button's states.

void NIApplyTitleColorSelectorToButton;

Discussion

Parameters

selector	A selector of the form: (UIColor *)colorWithControlState:(UIControlState)controlState
target	The target upon which the selector will be invoked.
button	The button object whose properties should be modified.