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//
// CustomPageControl.m
// Parking
//
// Created by admin on 15/9/16.
// Copyright (c) 2015年 moobox. All rights reserved.
//
#import "CustomPageControl.h"
#define kDotDiameter 4.0f
#define kDotSpace 12.0f
@implementation CustomPageControl
@synthesize numberOfPages ;
@synthesize currentPage ;
@synthesize hidesForSinglePage ;
@synthesize defersCurrentPageDisplay ;
@synthesize onColor ;
@synthesize offColor ;
@synthesize indicatorDiameter ;
@synthesize indicatorSpace ;
#pragma mark - init
- (id)init {
self = [self initWithFrame:CGRectZero] ;
return self ;
}
- (id)initWithFrame:(CGRect)frame {
if ((self = [super initWithFrame:CGRectZero])) {
self.backgroundColor = [UIColor clearColor] ;
}
return self ;
}
#pragma mark - drawRect
- (void)drawRect:(CGRect)rect {
// 获取上下文
CGContextRef context = UIGraphicsGetCurrentContext() ;
CGContextSaveGState(context) ;
CGContextSetAllowsAntialiasing(context, TRUE) ;
// 判断小点点直径 间距
CGFloat diameter = (indicatorDiameter > 0) ? indicatorDiameter : kDotDiameter ;
CGFloat space = (indicatorSpace > 0) ? indicatorSpace : kDotSpace ;
// 整个pageControl的bounds
CGRect currentBounds = self.bounds;
CGFloat dotsWidth = self.numberOfPages * diameter + MAX(0, self.numberOfPages - 1) * space;
CGFloat x = CGRectGetMidX(currentBounds) - dotsWidth / 2;
CGFloat y = CGRectGetMidY(currentBounds) - diameter / 2;
// 设置选中和未选中的小点点的颜色
CGColorRef onColorCG = onColor ? onColor.CGColor : [UIColor colorWithWhite: 1.0f alpha: 1.0f].CGColor ;
CGColorRef offColorCG = offColor ? offColor.CGColor : [UIColor colorWithWhite: 0.7f alpha: 0.5f].CGColor ;
// 遍历画（draw）点
for (int i = 0 ; i < numberOfPages ; i++)
{
CGRect dotRect = CGRectMake(x, y, diameter, diameter) ;
if (i == currentPage) {
CGContextSetFillColorWithColor(context, onColorCG) ;
CGContextFillEllipseInRect(context, CGRectInset(dotRect, -0.5f, -0.5f)) ;
} else {
CGContextSetStrokeColorWithColor(context, offColorCG) ;
CGContextStrokeEllipseInRect(context, dotRect) ;
}
x += diameter + space ;
}
// 恢复画板
CGContextRestoreGState(context) ;
}
#pragma mark - 重写setter方法
- (void)setCurrentPage:(NSInteger)pageNumber {
if (currentPage == pageNumber) {
return;
}
currentPage = MIN(MAX(0, pageNumber), numberOfPages - 1);
if (self.defersCurrentPageDisplay == NO) {
[self setNeedsDisplay];
}
}
- (void)setNumberOfPages:(NSInteger)numOfPages {
numberOfPages = MAX(0, numOfPages);
currentPage = MIN(MAX(0, currentPage), numberOfPages - 1);
self.bounds = self.bounds;
[self setNeedsDisplay];
if (hidesForSinglePage && (numOfPages < 2)) {
[self setHidden: YES];
} else {
[self setHidden: NO];
}
}
- (void)setHidesForSinglePage:(BOOL)hide {
hidesForSinglePage = hide ;
if (hidesForSinglePage && (numberOfPages < 2)){
[self setHidden:YES];
}
}
- (void)setDefersCurrentPageDisplay:(BOOL)defers {
defersCurrentPageDisplay = defers ;
}
- (void)setOnColor:(UIColor *)aColor {
onColor = aColor;
[self setNeedsDisplay];
}
- (void)setOffColor:(UIColor *)aColor {
offColor = aColor;
[self setNeedsDisplay];
}
- (void)setIndicatorDiameter:(CGFloat)aDiameter {
indicatorDiameter = aDiameter;
self.bounds = self.bounds;
[self setNeedsDisplay];
}
- (void)setIndicatorSpace:(CGFloat)aSpace {
indicatorSpace = aSpace;
self.bounds = self.bounds;
[self setNeedsDisplay];
}
- (void)setFrame:(CGRect)aFrame {
aFrame.size = [self sizeForNumberOfPages:numberOfPages];
super.frame = aFrame;
}
- (void)setBounds:(CGRect)aBounds {
aBounds.size = [self sizeForNumberOfPages: numberOfPages];
super.bounds = aBounds;
}
#pragma mark UIPageControl methods
- (void)updateCurrentPageDisplay {
if (self.defersCurrentPageDisplay == NO) {
return;
}
[self setNeedsDisplay] ;
}
- (CGSize)sizeForNumberOfPages:(NSInteger)pageCount {
CGFloat diameter = (indicatorDiameter > 0) ? indicatorDiameter : kDotDiameter;
CGFloat space = (indicatorSpace > 0) ? indicatorSpace : kDotSpace;
return CGSizeMake(pageCount * diameter + (pageCount - 1) * space + 44.0f, MAX(44.0f, diameter + 4.0f));
}
#pragma mark - Touches handlers
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
// 获取触摸的地方
UITouch *theTouch = [touches anyObject] ;
CGPoint touchLocation = [theTouch locationInView: self] ;
// 检测触摸的方向
if (touchLocation.x < (self.bounds.size.width / 2)) {
self.currentPage = MAX(self.currentPage - 1, 0);
} else {
self.currentPage = MIN(self.currentPage + 1, numberOfPages - 1);
}
[self sendActionsForControlEvents: UIControlEventValueChanged] ;
}
@end