• 有時候我們根據(jù)項目開發(fā)的需要，系統(tǒng)為的UIPageControl的樣式可能并不是我們想要的，這個時候我們就需要根據(jù)自己實際需求情況自定義UIPageControl
  例如：

  
  
  自定義方式1

自定義方式2

• 那么這種效果怎么實現(xiàn)呢？別的不多說，我們上代碼代碼：首先：我們自定義一個類：CustomPageControl類 其父類是UIView

.h

#import <UIKit/UIKit.h>
@interface CustomPageControl : UIView

typedef enum: NSInteger
{
    //默認類型/圓形
    PageControlStyleCircle = 0,
    //正方形
    PageControlStyleSquare,
    
    //......
}PageControlStyle;

@property(nonatomic,assign)NSInteger numberOfPags; //點個數(shù)
@property(nonatomic,assign)NSInteger currentPags;  //當前點位置

@property(nonatomic,strong)UIColor *selectedColor; //選中的色
@property(nonatomic,strong)UIColor *backPageColor; //背景色

@property(nonatomic,assign)PageControlStyle pageControlStyle;//類別

//自定義初始化方法
-(id)initWithFrame:(CGRect)frame pageControlStyle:(PageControlStyle)pageControlStyle ;
@end

.m

初始化

-(id)initWithFrame:(CGRect)frame pageControlStyle:(PageControlStyle)pageControlStyle{
    if (self = [super initWithFrame:frame]) {
        //默認設(shè)置
        _backPageColor = [UIColor darkTextColor];
        _selectedColor = [UIColor whiteColor];
        _pageControlStyle = pageControlStyle;
        _currentPags = 0;
    }
    return self;
}

設(shè)置PageView

-(void)setNumberOfPags:(NSInteger)numberOfPags{
    if (_numberOfPags != numberOfPags) {
        _numberOfPags = numberOfPags;
        CGFloat margin = 10;
        NSLog(@"%f",self.frame.size.width);
        CGFloat width = self.frame.size.width - (numberOfPags - 1)*margin;
        CGFloat pointWidth = width / numberOfPags;
        
        for (int i = 0; i < numberOfPags; i++) {
            UIView *aview = [[UIView alloc]init];
            aview.frame = CGRectMake((margin + pointWidth) * i, 0, pointWidth, pointWidth);
            aview.backgroundColor = _backPageColor;
            switch (_pageControlStyle) {
                case PageControlStyleCircle:
                    aview.layer.cornerRadius = pointWidth / 2 ;
                    aview.layer.masksToBounds = YES;
                    break;
                case PageControlStyleSquare:
                    break;
                default:
                    break;
            }
            [self addSubview:aview];
            
            /**
             *  設(shè)置cuurrentPag
             */
            if (i == 0) {
                if (_selectedColor) {
                    aview.backgroundColor = _selectedColor;
                }
                else
                {
                    aview.backgroundColor = [UIColor whiteColor];
                }
            }
        }
    }
}

• 當前的currentPage

-(void)setCurrentPags:(NSInteger)currentPags{
    if (_currentPags != currentPags) {
        _currentPags = currentPags;
        if (self.subviews.count) {
            for (UIView *aView in self.subviews) {
                aView.backgroundColor = _backPageColor;
            }
            UIView *aView = self.subviews[_currentPags];
            aView.backgroundColor = _selectedColor;
        }
    }
}

• 設(shè)置選中的顏色

-(void)setSelectedColor:(UIColor *)selectedColor{
    if (_selectedColor != selectedColor) {
        _selectedColor = selectedColor;
        if (self.subviews.count) {
            UIView *aView = self.subviews[_currentPags];
            aView.backgroundColor = _selectedColor;
        }
    }
}

• 設(shè)置背景色

-(void)setbackgroundColor:(UIColor *)backgroundColor{
    if (_backPageColor != backgroundColor) {
        _backPageColor = backgroundColor;
        if (self.subviews.count != 0) {
            for (UIView *aView in self.subviews) {
                aView.backgroundColor = _backPageColor;
            }
            UIView *aView = self.subviews[_currentPags];
            aView.backgroundColor = _selectedColor;
        }
    }
}

• 以上是對UIPageControl的自定義 那么使用起來就更簡單了我們導(dǎo)入頭文件

#import "CustomPageControl.h"

@interface ViewController ()<UIScrollViewDelegate>
{
    CustomPageControl *pageControl;
    UIScrollView *scrollView;
}
@end
#define screenWidth self.view.frame.size.width
#define screenHeight self.view.frame.size.height

• 在viewDidLoad 中:

scrollView = [[UIScrollView alloc]init];
scrollView.frame= CGRectMake(0, 0, screenWidth, screenHeight);
scrollView.contentSize = CGSizeMake(5 * screenWidth, screenHeight);
scrollView.delegate =self;
scrollView.pagingEnabled = YES;
scrollView.bounces = NO;
[self.view addSubview:scrollView];

for (int i = 1; i <= 5; i++) {
    UIImageView *aImageView = [[UIImageView alloc]init];
    aImageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"%d",i]];
    
    aImageView.frame = CGRectMake((i - 1) * screenWidth, 0, screenWidth, screenHeight);
    aImageView.contentMode = UIViewContentModeScaleAspectFit;
    [scrollView addSubview:aImageView];
}
pageControl = [[CustomPageControl alloc]initWithFrame:CGRectMake(100, screenHeight - 50, screenWidth - 200, 35) pageControlStyle:PageControlStyleSquare];
//    pageControl.backgroundColor = [UIColor redColor];
pageControl.backPageColor = [UIColor cyanColor];
pageControl.selectedColor = [UIColor blackColor];
pageControl.numberOfPags = 5;
[self.view addSubview:pageControl];

• 由于 scrollView.delegate =self;我們實現(xiàn)UIScrollViewDelegate中的scrollViewDidScroll:方法 用來監(jiān)聽在scrollView滾動的時候的偏移量 來改變pageControl的顯示樣式：

- (void)scrollViewDidScroll:(UIScrollView *)scrollVi
{
    CGFloat size = scrollView.contentOffset.x;
    NSInteger index = (size/scrollView.frame.size.width) + 0.5;
    NSLog(@"%f-%ld",size,index);
    pageControl.currentPags = index;
}

• 此時 運行程序 就是我們想要看到的效果了。