Purpose

SliceButton is a button that is shaped like a pie/pizza and sliced up according to the number in the buttons property. It supports user-input and responds to any touches by firing the delegate sliceButtonTapped:buttonIndex: method with information about which 'slice' was touched. The button itself only represents half of a pie/pizza (either left or right half). You can use two buttons to form a full pie/pizza.

Supported OS & SDK Versions

• Supported build target - iOS 7.0+
• Earliest supported deployment target - iOS 4.0

Installation

Properties

An image that looks like a pie/pizza shaped button should be provided. The image should have the 'slices' clearly marked. See the image "LeftSlice.png" that is provided in the example project for guidance.

@property (nonatomic, strong) UIImage *button_image;

An optional image can be provided. It should be small (i.e. 12x12) and circular. When a user touches a 'slice', the selected property can be set to the 'slice' that was touched. The selected property dictates where this image is placed. It is placed in the middle of the 'selected' slice.

@property (nonatomic, strong) UIImage *dot_image;

This forms a small circle that is centred around the centre of the 'pie'. This area does not respond to user-input (i.e. touches). Although strictly optional (i.e. you can set the value to 0), it is recommended that you set the small_radius value based on the size of the 'average' users fingers.

@property int small_radius;

This forms the big circle that represents the outer edge of the 'pie'. Any touches on the outside of the outer edge is ignored. The value should be set based on the button_image provided. See the image "LeftSlice.png" that is provided in the example project for guidance.

@property (nonatomic) int big_radius;

If this property is set to YES, then the button only shows the RIGHT side of the pie/pizza. Whether the button should respond or not to a particular touch (based on the position of the touch) is influenced by this property. If the property is set to NO, then the button only shows the LEFT side.

@property BOOL orientation_left;

This sets how many 'slices' the button should have. It should correspond to how many slices are drawn on the button_image provided. See the image "LeftSlice.png" that is provided in the example project for guidance.

@property int buttons;

This sets which 'slice' should be noted as being touched. A value of -1 means none is selected. Any other value between 0 and (buttons - 1) property will draw the dot_image provided near the outer edge of the 'pie'. The selected value represents the slice counting from the top down. The top-most slice is represented by selected=0...

@property (nonatomic) int selected; //-1 = none

This represents how far inwards the dot_image is drawn relative to the outer edge. A value of 0 will center the center of the dot_image at the outer-edge (as determined by big_radius). The larger the dot_image_radius_offset property is, the more inward dot_image gets drawn.

@property (nonatomic) float dot_image_radius_offset;

Optional delegate that will implement sliceButtonTapped:buttonIndex: so that when the user touches a 'slice', the sliceButtonTapped:buttonIndex: method will get fired. The method's buttonIndex value will indicate which 'slice' was touched. It does not automatically 'adjust' the 'selected' property. You must do so yourself.

@property (nonatomic, weak) IBOutlet id <SliceButtonDelegate> delegate;

This is for debugging purposes ONLY. When it is set to YES, the background image provided (button_image) will be shown with a CLEAR marking of where the button believes the individual slices are. The button uses the CLEAR marking to determine the boundaries of each slice which is itself used to determine which slice was touched. Use this property to ENSURE that the background image provided clearly aligns with the button's CLEAR marking. They MUST align precisely.

@property (nonatomic) BOOL debug;

Methods

Initializer: The initializer automatically places the button inside the superview container. You still must set the frame of the button accordingly using the inherited frame property. See the Example Project for an illustration. All the arguments are self-explanatory and correspond to the properties noted above. The ButtonNumber argument corresponds to the button property.

- (id)initWithSettingsSuchAsLeftOrientation:(BOOL)orientation_left ButtonNumber:(int)number SmallRadius:(int)small_radius BigRadius:(int)big_radius Image:(UIImage *)image DotImage:(UIImage *)dot_image DotImageRadiusOffset:(float)offset SuperView:(UIView*)superview;

Delegate methods

Optional delegate can implement sliceButtonTapped:buttonIndex: so that when the user touches a 'slice', the sliceButtonTapped:buttonIndex: will get fired. The method's buttonIndex value will indicate which 'slice' was touched. It does not automatically adjust the selected property. You must do so yourself. See the Example Project for an illustration.

-(void)sliceButtonTapped: (SliceButton *)sliceButton buttonIndex:(int) index;

Example Projects

The Example Project will showcase how to use the button and also respond to use input.

Any Questions

If you found this library useful, please Star it on github. Feel free to fork or provide pull requests. Any bug reports will be warmly received.

PJ Engineering and Business Solutions Pty. Ltd http://www.pjebs.com.au