UI development ---- UIScrollView and UIPageControl simulate the scroll view and uipagecontrol

UI development ---- UIScrollView and UIPageControl simulate the scroll view and uipagecontrol

// Created By Guo Zi

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UIScrollView:

UIScrollView * scrollView = [[UIScrollView alloc] initWithFrame: CGRectMake (20, 50,200,200)]; scrollView. backgroundColor = [UIColor greenColor]; [self. view addSubview: scrollView]; // sets the content size when contentSize is greater than scrollView. frame. size to slide scrollView. contentSize = CGSizeMake (1000,100 0); UIView * view = [[UIView alloc] initWithFrame: CGRectMake (50, 50, 50)]; view. backgroundColor = [UIColor redColor]; [scrollView addSubview: view]; scrollView. showsHorizontalScrollIndicator = YES; scrollView. showsVerticalScrollIndicator = YES; // scrollView. contentOffset = CGPointMake (50, 50); // scrollView. pagingEnabled = YES; UIView * view2 = [[UIView alloc] initWithFrame: CGRectMake (200, 50, 50, 50)]; view2.backgroundColor = [UIColor blackColor]; [scrollView addSubview: view2]; [view2 release]; scrollView. bounces = YES;) scrollView. scrollsToTop = YES; scrollView. scrollEnabled = YES; scrollView. alwaysBounceHorizontal = NO; scrollView. alwaysBounceVertical = YES; scrollView. minimumZoomScale = 0.5; scrollView. maximumZoomScale = 2; scrollView. zoomScale = 1.5; // sets the proxy scrollView. delegate = self;

To implement the zoom function, follow UIScrollViewDelegate and set itself as a proxy.

For example:

- (UIView *)            viewForZoomingInScrollView:            (UIScrollView *)scrollView{   // NSLog(@"%@",NSStringFromCGSize(scrollView.contentSize));    return [scrollView.subviews objectAtIndex:0];   }

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UIPageView:

 UIPageControl *pageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(50, 400, 200, 50)];    pageControl.backgroundColor = [UIColor orangeColor];    [self.view addSubview:pageControl];        pageControl.numberOfPages = 5;    pageControl.currentPage = 2;    pageControl.pageIndicatorTintColor = [UIColor blueColor];    pageControl.currentPageIndicatorTintColor = [UIColor whiteColor];    [pageControl addTarget:self action:@selector(pageControlChange:) forControlEvents:UIControlEventValueChanged];    

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Simulation of a rolling View:

UIScrollView * scrollView = [[UIScrollView alloc] initWithFrame: self. view. bounds]; // _ scrollView = scrollView; [self. view addSubview: scrollView]; scrollView. pagingEnabled = YES; // scrollView. delegate = self; scrollView. contentSize = CGSizeMake (320*5,568); // put the image name in the array NSArray * imagesName = [NSArray arrayWithObjects: @ "1.png", @" 2.png", @ "3.png ", @ "4.png", @" 5.png", nil]; for (int I = 0; I <imagesName. count; I ++) {UIImage * img = [UIImage imageNamed: [imagesName objectAtIndex: I]; UIImageView * imageView = [[UIImageView alloc] initWithFrame: CGRectMake (I * 320, 0,320,568)]; imageView. image = img; [scrollView addSubview: imageView]; [imageView release];} UIPageControl * pageControl = [[UIPageControl alloc] initWithFrame: CGRectMake (50,400,200, 50)]; pageControl. numberOfPages = 5; [pageControl addTarget: self action: @ selector (pageChanged :) forControlEvents: UIControlEventValueChanged]; pageControl. pageIndicatorTintColor = [UIColor redColor]; pageControl. currentPageIndicatorTintColor = [UIColor blackColor]; // self. pageControl = pageControl; [self. view addSubview: pageControl]; [pageControl release]; [scrollView release];

Method implementation:

-(Void) scrollViewDidEndDecelerating :( UIScrollView *) scrollView {CGPoint offSet = scrollView. contentOffset; int pageCount = offSet. x/320; _ pageControl. currentPage = pageCount;}-(void) pageChanged :( UIPageControl *) control {long currentPage = control. currentPage; CGPoint offSet = CGPointMake (currentPage * 320, 0); // set the scrollView offSet [self. scrollView setContentOffset: offSet animated: YES];}

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