借鉴文章：http://blog.csdn.net/showhilllee/article/details/8350663
找了好多文章，想找个最简单的方法来自定义pageControl，觉得这种方法是代码相对较少的，但是帖子比较古老了，里面的 updateDots 设置的为UImageView,现在xcode是跑不起来的，dug下发现原来，现在的subviews 中存的为UIView，直接上一段代码，随手写的demo没有像外界提供任何接口，纯属了解思路用

.h文件中

import <UIKit/UIKit.h>

@interface XMPageControl : UIPageControl

@end

.m文件

import "XMPageControl.h"

#define SCREEN_WITH [[UIScreen mainScreen]bounds].size.width

@implementation XMPageControl

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
    }
    return self;
}

- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    return self;
}

- (void)endTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
    [super endTrackingWithTouch:touch withEvent:event];
    [self updateDots];
}

- (void)updateDots {
    for (int i=0; i<self.subviews.count; ++i) {
        UIView *dot = [self.subviews objectAtIndex:i];
        //此处两个color可以抽出，为外界提供接口
        dot.backgroundColor = i==self.currentPage ? [UIColor orangeColor]:[UIColor redColor];
    }
}

/**
 *  如果想实现帖子这种http://blog.csdn.net/showhilllee/article/details/8350663设置image，
 *  可参考思路，在layoutSurviews中 remove掉所有的 view 替换为imageView,
 *  还可设置uiview的layer根据image绘制 backgroundcolor
 */

- (void)layoutSubviews {
    [super layoutSubviews];
    
    CGFloat space = 5.f;    //space, dotW H 等可以可抽出为外界所用
    CGFloat dotW = SCREEN_WITH/14.f;
    CGFloat dotH = dotW/7.f;
    CGFloat totalWith = (dotW+space)  * self.numberOfPages;
    for (int i=0; i<self.subviews.count; ++i) {
        UIView *dot = [self.subviews objectAtIndex:i];
        CGFloat dotX = (self.frame.size.width-totalWith)/2.f + (space+dotW)*i;
        CGFloat dotY = (self.frame.size.height-dotH)/2.f;
        dot.frame = CGRectMake(dotX, dotY, dotW, dotH);
    }
    
}

- (void)setCurrentPage:(NSInteger)currentPage {
    [super setCurrentPage:currentPage];
    [self updateDots];
}

@end

没有提供任何的接口，用法和常规无异！
效果如图：

Snip20160523_2.png