iOS开发UIPageControl常用属性方法
//
// ViewController.m
// UIPageControlAll
#import "ViewController.h"
@interface ViewController ()<UIScrollViewDelegate>
{
UIScrollView *helpScrView;
UIPageControl *pageCtrl;
}
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
CGRect bounds = self.view.frame; //获取界面区域
//加载蒙板图片，限于篇幅，这里仅显示一张图片的加载方法
UIImageView* imageView1 = [[UIImageView alloc] initWithFrame:CGRectMake(0,[UIScreen mainScreen].bounds.origin.y, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)]; //创建UIImageView，位置大小与主界面一样。
imageView1.backgroundColor = [UIColor brownColor];
//imageView1.alpha = 0.5f; //将透明度设为50%。
UIImageView* imageView2 = [[UIImageView alloc] initWithFrame:CGRectMake([UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.origin.y, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)]; //创建UIImageView，位置大小与主界面一样。
imageView2.backgroundColor = [UIColor cyanColor];
//继续加载图片
//。。。。
//创建UIScrollView
helpScrView = [[UIScrollView alloc] initWithFrame:CGRectMake(bounds.origin.x, bounds.origin.y, bounds.size.width, 300)]; //创建UIScrollView，位置大小与主界面一样。
[helpScrView setContentSize:CGSizeMake(bounds.size.width * 6, 300)]; //设置全部内容的尺寸，这里帮助图片是3张，所以宽度设为界面宽度*3，高度和界面一致。
helpScrView.pagingEnabled = YES; //设为YES时，会按页滑动
helpScrView.bounces = NO; //取消UIScrollView的弹性属性，这个可以按个人喜好来定
[helpScrView setDelegate:self];//UIScrollView的delegate函数在本类中定义
helpScrView.showsHorizontalScrollIndicator = NO; //因为我们使用UIPageControl表示页面进度，所以取消UIScrollView自己的进度条。
[helpScrView addSubview:imageView2];
[helpScrView addSubview:imageView1];//将UIImageView添加到UIScrollView中。
helpScrView.backgroundColor = [UIColor purpleColor];
[self.view addSubview:helpScrView]; //将UIScrollView添加到主界面上。
//创建UIPageControl
pageCtrl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, 400, bounds.size.width, 30)]; //创建UIPageControl，位置在屏幕最下方。
pageCtrl.numberOfPages = 2;//总的图片页数
pageCtrl.currentPageIndicatorTintColor = [UIColor redColor];
pageCtrl.pageIndicatorTintColor = [UIColor orangeColor];
pageCtrl.currentPage = 0; //当前页
[pageCtrl addTarget:self action:@selector(pageTurn:) forControlEvents:UIControlEventValueChanged]; //用户点击UIPageControl的响应函数
[self.view addSubview:pageCtrl]; //将UIPageControl添加到主界面上。
}
//其次是UIScrollViewDelegate的scrollViewDidEndDecelerating函数，用户滑动页面停下后调用该函数。
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
//更新UIPageControl的当前页
CGPoint offset = scrollView.contentOffset;
CGRect bounds = scrollView.frame;
[pageCtrl setCurrentPage:offset.x / bounds.size.width];
NSLog(@"%f",offset.x / bounds.size.width);
}
//然后是点击UIPageControl时的响应函数pageTurn
- (void)pageTurn:(UIPageControl*)sender
{
//令UIScrollView做出相应的滑动显示
CGSize viewSize = helpScrView.frame.size;
CGRect rect = CGRectMake(sender.currentPage * viewSize.width, 0, viewSize.width, viewSize.height);
[helpScrView scrollRectToVisible:rect animated:YES];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
