UIPageControl基本用法

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1、我的理解，他就是一个指示作用，当然通过监视滑动动作，也可以控制页面、视图的变化，可以和UIScrollView、UIPageViewController等配合使用

基本用法如下：

////  ViewController.m#import "ViewController.h"@interface ViewController (){    UIPageControl * _pageControl;    BOOL isAdd;}@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    self.view.backgroundColor = [UIColor whiteColor];    isAdd = true;        CGFloat width = [[UIScreen mainScreen] bounds].size.width;    CGFloat height = [[UIScreen mainScreen] bounds].size.height;        _pageControl = [[UIPageControl alloc] init];    _pageControl.frame = CGRectMake(25, height - 100, width - 50, 30);    _pageControl.backgroundColor = [UIColor orangeColor];    //设置控制页面数，就是多少个点    _pageControl.numberOfPages = 6;    //设置当前点    _pageControl.currentPage = 3;    //设置所有点的颜色    _pageControl.pageIndicatorTintColor = [UIColor whiteColor];    //设置当前点得颜色    _pageControl.currentPageIndicatorTintColor = [UIColor redColor];    [self.view addSubview:_pageControl];        //如果这个设置为YES，则当前点不会变//    _pageControl.defersCurrentPageDisplay = YES;        //添加监视其状态的事件    [_pageControl addTarget:self action:@selector(pageControlClick:) forControlEvents:UIControlEventValueChanged];        UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom];    btn.frame = CGRectMake(100, 100, 50, 30);    btn.layer.cornerRadius = 10;    [btn setTitle:@"点击" forState:UIControlStateNormal];    [self.view addSubview:btn];    [btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];    [btn setBackgroundColor:[UIColor purpleColor]];}- (void) pageControlClick : (id) sender {    NSLog(@"%li", (long)_pageControl.currentPage);}- (void) btnClick : (id) sender {    if (isAdd) {        _pageControl.currentPage += 1;    }else{        _pageControl.currentPage -= 1;    }        if (_pageControl.currentPage == 5) {        isAdd = false;    }    if (_pageControl.currentPage == 0) {        isAdd = true;    }    //更新UI    [_pageControl updateCurrentPageDisplay];}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

连续点击button可以控制UIPageControl反复变化：

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