項目需求，需要一個PageControl，dot里是1，2，3，4數字的，隨便寫了一個，有一些坑沒填完，用的時候注意就沒什么問題。

#import <UIKit/UIKit.h>

@interface CZYPageControl : UIView

//pageDot之間的間隔
@property(nonatomic,assign)float spacing;
//未選中的dot尺寸
@property(nonatomic,assign)float minDotValue;
//選中的dot尺寸
@property(nonatomic,assign)float maxDotValue;
//未選中dot的背景顏色
@property(nonatomic,strong)UIColor *NoSelectedDotBackColor;
//選中dot的背景顏色
@property(nonatomic,strong)UIColor *SelectedDotBackColor;
//dot中間字體的顏色
@property(nonatomic,strong)UIColor *fontColor;
//scrol是所關聯的那個UIScrollView
-(instancetype)CpageInitWithFrame:(CGRect)frame pageNumber:(NSInteger)pageNumber controllingScrol:(UIScrollView *)scrol;
@end

#import "CZYPageControl.h"
@interface CZYPageControl()
@property(nonatomic,assign)NSInteger pageNumber;
@property(nonatomic,strong)UIScrollView *scrol;

@end
@implementation CZYPageControl
-(instancetype)CpageInitWithFrame:(CGRect)frame pageNumber:(NSInteger)pageNumber controllingScrol:(UIScrollView *)scrol
{
    if ([super initWithFrame:frame]) {
        _pageNumber=pageNumber;
        _scrol=scrol;
        [self setDefault];
    }
    return self;
}
//默認設置
-(void)setDefault
{
    _spacing=11.0;
    _minDotValue=22.0;
    _maxDotValue=32.0;
    _NoSelectedDotBackColor=[UIColor grayColor];
    _SelectedDotBackColor=GREEN;
    _fontColor=[UIColor whiteColor];
    [_scrol addObserver:self forKeyPath:@"contentOffset" options:(NSKeyValueObservingOptionNew) context:nil];
}
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
    
    CGPoint newOffset = [change[@"new"] CGPointValue];
    NSLog(@"%lf",newOffset.x);
    int index=(newOffset.x) / ([UIScreen mainScreen].bounds.size.width);
    for (int i=0; i<_pageNumber; i++) {
        [self viewWithTag:10+i].hidden=YES;
    }
    [self viewWithTag:10+index].hidden=NO;
    while (newOffset.x>WIDTH) {
        newOffset.x-=WIDTH;
    }
    
    
}

-(void)layoutSubviews
{
    [self creatUI];
    [_scrol setContentOffset:CGPointMake(0, 0)];
}
-(void)creatUI
{
    
    for (int i=0; i<_pageNumber; i++) {
        UILabel *dotLabel=[[UILabel alloc]initWithFrame:CGRectMake(self.frame.size.width/2-((_pageNumber*_minDotValue+(_pageNumber-1)*_spacing)/2)+i*(_minDotValue+_spacing) , self.frame.size.height/2-_minDotValue/2, _minDotValue, _minDotValue)];
        dotLabel.tag=i;
        dotLabel.layer.cornerRadius=_minDotValue/2;
        dotLabel.layer.masksToBounds=YES;
        dotLabel.backgroundColor=_NoSelectedDotBackColor;
        dotLabel.font=[UIFont fontWithName:@"Lato-Regular" size:13];
        dotLabel.textAlignment=NSTextAlignmentCenter;
        dotLabel.textColor=_fontColor;
        dotLabel.text=[NSString stringWithFormat:@"%d",i+1];
        [self addSubview:dotLabel];
        
        
        
        UILabel *selectdotLabel=[[UILabel alloc]init];
        selectdotLabel.center=CGPointMake(dotLabel.center.x, dotLabel.center.y);
        selectdotLabel.bounds=CGRectMake(0, 0, _maxDotValue, _maxDotValue);
        selectdotLabel.tag=i+10;
        selectdotLabel.layer.cornerRadius=_maxDotValue/2;
        selectdotLabel.layer.masksToBounds=YES;
        selectdotLabel.backgroundColor=_SelectedDotBackColor;
        selectdotLabel.font=[UIFont fontWithName:@"Lato-Regular" size:13];
        selectdotLabel.textAlignment=NSTextAlignmentCenter;
        selectdotLabel.textColor=_fontColor;
        selectdotLabel.text=[NSString stringWithFormat:@"%d",i+1];
        [self addSubview:selectdotLabel];
        selectdotLabel.hidden=YES;
        
        
        
    }
    
}
-(void)dealloc
{
    [_scrol removeObserver:self forKeyPath:@"contentOffset"];
}
@end

初始化方法只能這一種，使用其他初始化方式的情況沒有處理完，動畫也是很簡單，后面有需要在加吧