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‎Classes/DDPageControl.h

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//
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// DDPageControl.h
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// DDPageControl
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//
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// Created by Damien DeVille on 1/14/11.
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// Copyright 2011 Snappy Code. All rights reserved.
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//
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#import <Foundation/Foundation.h>
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#import <UIKit/UIControl.h>
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#import <UIKit/UIKitDefines.h>
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typedef enum
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{
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DDPageControlTypeOnFullOffFull = 0,
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DDPageControlTypeOnFullOffEmpty = 1,
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DDPageControlTypeOnEmptyOffFull = 2,
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DDPageControlTypeOnEmptyOffEmpty = 3,
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}
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DDPageControlType ;
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@interface DDPageControl : UIControl
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{
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NSInteger numberOfPages ;
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NSInteger currentPage ;
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}
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// Replicate UIPageControl features
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@property(nonatomic) NSInteger numberOfPages ;
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@property(nonatomic) NSInteger currentPage ;
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@property(nonatomic) BOOL hidesForSinglePage ;
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@property(nonatomic) BOOL defersCurrentPageDisplay ;
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- (void)updateCurrentPageDisplay ;
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- (CGSize)sizeForNumberOfPages:(NSInteger)pageCount ;
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/*
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DDPageControl add-ons - all these parameters are optional
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Not using any of these parameters produce a page control identical to Apple's UIPage control
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*/
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- (id)initWithType:(DDPageControlType)theType ;
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@property (nonatomic) DDPageControlType type ;
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@property (nonatomic,retain) UIColor *onColor ;
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@property (nonatomic,retain) UIColor *offColor ;
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@property (nonatomic) CGFloat indicatorDiameter ;
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@property (nonatomic) CGFloat indicatorSpace ;
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@end
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‎Classes/DDPageControl.m

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//
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// DDPageControl.m
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// DDPageControl
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//
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// Created by Damien DeVille on 1/14/11.
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// Copyright 2011 Snappy Code. All rights reserved.
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//
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#import "DDPageControl.h"
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#define kDotDiameter 4.0f
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#define kDotSpace 12.0f
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@interface DDPageControl (Private)
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- (void)callTargetForValueChanged ;
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@end
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@implementation DDPageControl
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@synthesize numberOfPages ;
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@synthesize currentPage ;
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@synthesize hidesForSinglePage ;
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@synthesize defersCurrentPageDisplay ;
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@synthesize type ;
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@synthesize onColor ;
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@synthesize offColor ;
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@synthesize indicatorDiameter ;
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@synthesize indicatorSpace ;
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#pragma mark -
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#pragma mark Initializers - dealloc
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- (id)initWithType:(DDPageControlType)theType
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{
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self = [self initWithFrame: CGRectZero] ;
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[self setType: theType] ;
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return self ;
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}
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- (id)init
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{
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self = [self initWithFrame: CGRectZero] ;
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return self ;
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}
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- (id)initWithFrame:(CGRect)frame
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{
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if ((self = [super initWithFrame: CGRectZero]))
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{
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self.backgroundColor = [UIColor clearColor] ;
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}
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return self ;
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}
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- (void)dealloc
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{
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[onColor release], onColor = nil ;
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[offColor release], offColor = nil ;
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[super dealloc] ;
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}
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#pragma mark -
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#pragma mark drawRect
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- (void)drawRect:(CGRect)rect
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{
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// get the current context
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CGContextRef context = UIGraphicsGetCurrentContext() ;
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// save the context
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CGContextSaveGState(context) ;
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// allow antialiasing
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CGContextSetAllowsAntialiasing(context, TRUE) ;
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// get the caller's diameter if it has been set or use the default one
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CGFloat diameter = (indicatorDiameter > 0) ? indicatorDiameter : kDotDiameter ;
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CGFloat space = (indicatorSpace > 0) ? indicatorSpace : kDotSpace ;
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// geometry
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CGRect currentBounds = self.bounds ;
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CGFloat dotsWidth = self.numberOfPages * diameter + MAX(0, self.numberOfPages - 1) * space ;
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CGFloat x = CGRectGetMidX(currentBounds) - dotsWidth / 2 ;
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CGFloat y = CGRectGetMidY(currentBounds) - diameter / 2 ;
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// get the caller's colors it they have been set or use the defaults
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CGColorRef onColorCG = onColor ? onColor.CGColor : [UIColor colorWithWhite: 1.0f alpha: 1.0f].CGColor ;
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CGColorRef offColorCG = offColor ? offColor.CGColor : [UIColor colorWithWhite: 0.7f alpha: 0.5f].CGColor ;
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// actually draw the dots
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for (int i = 0 ; i < numberOfPages ; i++)
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{
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CGRect dotRect = CGRectMake(x, y, diameter, diameter) ;
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if (i == currentPage)
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{
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if (type == DDPageControlTypeOnFullOffFull || type == DDPageControlTypeOnFullOffEmpty)
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{
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CGContextSetFillColorWithColor(context, onColorCG) ;
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CGContextFillEllipseInRect(context, CGRectInset(dotRect, -1.0f, -1.0f)) ;
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}
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else
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{
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CGContextSetStrokeColorWithColor(context, onColorCG) ;
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CGContextStrokeEllipseInRect(context, dotRect) ;
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}
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}
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else
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{
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if (type == DDPageControlTypeOnEmptyOffEmpty || type == DDPageControlTypeOnFullOffEmpty)
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{
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CGContextSetStrokeColorWithColor(context, offColorCG) ;
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CGContextStrokeEllipseInRect(context, dotRect) ;
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}
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else
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{
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CGContextSetFillColorWithColor(context, offColorCG) ;
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CGContextFillEllipseInRect(context, CGRectInset(dotRect, -1.0f, -1.0f)) ;
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}
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}
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x += diameter + space ;
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}
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// restore the context
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CGContextRestoreGState(context) ;
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}
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#pragma mark -
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#pragma mark Accessors
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- (void)setCurrentPage:(NSInteger)pageNumber
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{
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// no need to update in that case
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if (currentPage == pageNumber)
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return ;
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// determine if the page number is in the available range
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currentPage = MIN(MAX(0, pageNumber), numberOfPages - 1) ;
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// in case we do not defer the page update, we redraw the view
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if (self.defersCurrentPageDisplay == NO)
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[self setNeedsDisplay] ;
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}
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- (void)setNumberOfPages:(NSInteger)numOfPages
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{
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// make sure the number of pages is positive
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numberOfPages = MAX(0, numOfPages) ;
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// we then need to update the current page
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currentPage = MIN(MAX(0, currentPage), numberOfPages - 1) ;
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// correct the bounds accordingly
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self.bounds = self.bounds ;
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// we need to redraw
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[self setNeedsDisplay] ;
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// depending on the user preferences, we hide the page control with a single element
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if (hidesForSinglePage && (numOfPages < 2))
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[self setHidden: YES] ;
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else
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[self setHidden: NO] ;
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}
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- (void)setHidesForSinglePage:(BOOL)hide
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{
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hidesForSinglePage = hide ;
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// depending on the user preferences, we hide the page control with a single element
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if (hidesForSinglePage && (numberOfPages < 2))
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[self setHidden: YES] ;
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}
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- (void)setDefersCurrentPageDisplay:(BOOL)defers
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{
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defersCurrentPageDisplay = defers ;
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}
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- (void)setType:(DDPageControlType)aType
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{
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type = aType ;
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[self setNeedsDisplay] ;
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}
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- (void)setOnColor:(UIColor *)aColor
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{
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[aColor retain] ;
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[onColor release] ;
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onColor = aColor ;
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[self setNeedsDisplay] ;
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}
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- (void)setOffColor:(UIColor *)aColor
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{
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[aColor retain] ;
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[offColor release] ;
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offColor = aColor ;
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[self setNeedsDisplay] ;
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}
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- (void)setIndicatorDiameter:(CGFloat)aDiameter
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{
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indicatorDiameter = aDiameter ;
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// correct the bounds accordingly
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self.bounds = self.bounds ;
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[self setNeedsDisplay] ;
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}
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- (void)setIndicatorSpace:(CGFloat)aSpace
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{
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indicatorSpace = aSpace ;
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// correct the bounds accordingly
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self.bounds = self.bounds ;
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[self setNeedsDisplay] ;
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}
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- (void)setFrame:(CGRect)aFrame
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{
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// we do not allow the caller to modify the size struct in the frame so we compute it
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aFrame.size = [self sizeForNumberOfPages: numberOfPages] ;
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super.frame = aFrame ;
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}
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- (void)setBounds:(CGRect)aBounds
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{
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// we do not allow the caller to modify the size struct in the bounds so we compute it
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aBounds.size = [self sizeForNumberOfPages: numberOfPages] ;
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super.bounds = aBounds ;
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}
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#pragma mark -
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#pragma mark UIPageControl methods
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- (void)updateCurrentPageDisplay
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{
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// ignores this method if the value of defersPageIndicatorUpdate is NO
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if (self.defersCurrentPageDisplay == NO)
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return ;
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// in case it is YES, we redraw the view (that will update the page control to the correct page)
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[self setNeedsDisplay] ;
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}
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- (CGSize)sizeForNumberOfPages:(NSInteger)pageCount
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{
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CGFloat diameter = (indicatorDiameter > 0) ? indicatorDiameter : kDotDiameter ;
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CGFloat space = (indicatorSpace > 0) ? indicatorSpace : kDotSpace ;
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return CGSizeMake(pageCount * diameter + (pageCount - 1) * space + 44.0f, MAX(44.0f, diameter + 4.0f)) ;
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}
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#pragma mark -
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#pragma mark Touches handlers
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- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
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{
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// get the touch location
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UITouch *theTouch = [touches anyObject] ;
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CGPoint touchLocation = [theTouch locationInView: self] ;
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// check whether the touch is in the right or left hand-side of the control
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if (touchLocation.x < (self.bounds.size.width / 2))
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self.currentPage = MAX(self.currentPage - 1, 0) ;
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else
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self.currentPage = MIN(self.currentPage + 1, numberOfPages - 1) ;
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// call the target to alert that the value has changed
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[self callTargetForValueChanged] ;
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}
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#pragma mark -
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#pragma mark Target calls
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- (void)callTargetForValueChanged
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{
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// we get all targets for this object
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NSSet *allTargets = [self allTargets] ;
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NSArray *allActions ;
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for (id target in allTargets)
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{
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// get all actions associated with this target and the control event UIControlEventValueChanged
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allActions = [self actionsForTarget: target forControlEvent: UIControlEventValueChanged] ;
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for (NSString *action in allActions)
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{
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// perform the selector (action) on the target
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[target performSelector: NSSelectorFromString(action) withObject: self] ;
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}
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}
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}
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@end

‎Classes/DDPageControlAppDelegate.h

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//
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// DDPageControlAppDelegate.h
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// DDPageControl
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//
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// Created by Damien DeVille on 1/14/11.
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// Copyright 2011 Snappy Code. All rights reserved.
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//
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#import <UIKit/UIKit.h>
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@class DDPageControlViewController ;
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@interface DDPageControlAppDelegate : NSObject <UIApplicationDelegate>
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{
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UIWindow *window ;
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DDPageControlViewController *viewController ;
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}
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@property (nonatomic, retain) IBOutlet UIWindow *window ;
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@property (nonatomic, retain) IBOutlet DDPageControlViewController *viewController ;
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@end
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