UIKit 框架之UIPageControl

//
//  ViewController.m
//  UIPageControl
//
//  Created by City--Online on 15/5/19.
//  Copyright (c) 2015年 XQB. All rights reserved.
//
 
#import "ViewController.h"
 
@interface ViewController ()
@property(nonatomic,strong) UIPageControl  *pageControl;
@end
 
@implementation ViewController
 
- (void)viewDidLoad {
    [super viewDidLoad];
    _pageControl=[[UIPageControl alloc]init];
    _pageControl.frame=CGRectMake(20, 100, 100, 100);
    _pageControl.backgroundColor=[UIColor grayColor];
 
    //设置总页数
    _pageControl.numberOfPages=5;
     
    //设置当前页
    _pageControl.currentPage=2;
     
    //只有1页时隐藏
    _pageControl.hidesForSinglePage=YES;
     
    //根据页数获取需要的最小的size
    CGSize size=[_pageControl sizeForNumberOfPages:5];
    _pageControl.frame=CGRectMake(20, 100, size.width, size.height);
    NSLog(@"%@",NSStringFromCGSize(size));
     
    //设置圆点的颜色
    _pageControl.pageIndicatorTintColor=[UIColor blueColor];
    //设置当前选中圆点的颜色
    _pageControl.currentPageIndicatorTintColor=[UIColor yellowColor];
     
    //这个属性如果设置为YES，点击时并不会改变控制器显示的当前页码点，必须手动调用- (void)updateCurrentPageDisplay;这个方法，才会更新。
    _pageControl.defersCurrentPageDisplay=YES;
     
    [_pageControl addTarget:self action:@selector(pageIndexChanged) forControlEvents:UIControlEventValueChanged];
     
    [self.view addSubview:_pageControl];
     
}
-(void)pageIndexChanged
{
    NSInteger index=_pageControl.currentPage;
    NSLog(@"%ld",index);
    //暂停5秒钟
    sleep(5);
    //改变显示的页面 defersCurrentPageDisplay=NO时,方法无效
    [_pageControl updateCurrentPageDisplay];
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
 
@end

 此控件经常与UIScrollView控件一起使用。