IOS learning notes-scrollView and iosscrollview

IOS learning notes-scrollView and iosscrollview

Scroll view: add the UIScrollViewDelegate protocol to the root view and declare some object attributes.

@ Interface BoViewController: UIViewController <UIScrollViewDelegate> // The Rolling view object @ property (retain, nonatomic) UIScrollView * scrollView; // the page number of the small dot in the view. @ property (retain, nonatomic) UIPageControl * pageControl; // a dynamic array object that stores images @ property (retain, nonatomic) NSMutableArray * images; @ end/* Ask hovertree.com */

Import images in the program and implement the Code in the. m file:

-(Void) viewDidLoad {[super viewDidLoad]; // initialize scrollView self. scrollView = [[UIScrollView alloc] initWithFrame: CGRectMake (0, 0,320,345)]; // initialize pageControl self. pageControl = [[UIPageControl alloc] initWithFrame: CGRectMake (0,344,320, 36)]; // initializes an array to store the image self of the scroll view. images = [NSMutableArray attributes: [UIImage imageNamed: @ "text1.png"], [UIImage imageNamed: @ "text2.png"], [UIImage imageNamed: @ "text3.png"], [UIImage imageNamed: @ "text4.png"], nil]; // Add scrollView and pageControl to the current view [self. view addSubview: self. scrollView]; [self. view addSubview: self. pageControl]; // set the view background color self. view. backgroundColor = [UIColor blackColor]; // call the setuoPage method [self setupPage: nil];} // change the method implementation of the scrolling view-(void) setupPage :( id) sender {// set delegate self. scrollView. delegate = self; // set the background color self. scrollView. backgroundColor = [UIColor blackColor]; // set to untouch self. scrollView. cancancancelcontenttouches = NO; // set the scroll bar type self. scrollView. indicatorStyle = UIScrollViewIndicatorStyleWhite; // whether to automatically crop excess self. scrollView. clipsToBounds = YES; // sets whether self can be scaled. scrollView. scrollEnabled = YES; // sets whether screen switching self can be performed. scrollView. pagingEnabled = YES; // sets whether to lock itself in the horizontal or vertical direction when dragging. scrollView. directionalLockEnabled = NO; // hide the scroll bar settings (horizontal and vertical) self. scrollView. alwaysBounceHorizontal = NO; self. scrollView. alwaysBounceVertical = NO; self. scrollView. showsHorizontalScrollIndicator = NO; self. scrollView. showsVerticalScrollIndicator = NO; // used to record the number of pages NSUInteger pages = 0; // used to record the x coordinate int originX = 0 of scrollView; for (UIImage * image in self. images) {// create a view UIImageView * pImageView = [[[UIImageView alloc] initWithFrame: CGRectZero] autorelease]; // set the view background color pImageView. backgroundColor = [UIColor colorWithRed: 0.6 green: 0.6 blue: 0.6 alpha: 1.0]; // set the background image of the imageView [pImageView setImage: image]; // set the region CGRect rect = self for imageView. scrollView. frame; rect. origin. x = origct; rect. origin. y = 0; rect. size. width = self. scrollView. frame. size. width; rect. size. height = self. scrollView. frame. size. height; pImageView. frame = rect; // set the display mode of the image content (Adaptive Mode) pImageView. contentMode = UIViewContentModeScaleAspectFill; // Add the view to the current rolling view [self. scrollView addSubview: pImageView]; // The x coordinate of the next view: offset: self. scrollView. frame. size. width. originX + = self. scrollView. frame. size. width; // record the number of imageviews in the scrollView pages ++;} // set the response method of the page number controller [self. pageControl addTarget: self action: @ selector (changePage :) forControlEvents: UIControlEventValueChanged]; // set the total number of pages self. pageControl. numberOfPages = pages; // the current page is the first page self by default. pageControl. currentPage = 0; // set the tag self for the page number controller. pageControl. tag = 110; // set the position of the scroll view [self. scrollView setContentSize: CGSizeMake (originX, self. scrollView. bounds. size. height)];} // how to change the page number-(void) changePage :( id) sender {NSLog (@ "the current index value of the indicator is: % I", self. pageControl. currentPage); // obtain the current view page number CGRect rect = self. scrollView. frame; // set the horizontal coordinates of a view. A chart is 320*460, and the horizontal coordinates increase or decrease by 320 pixel rect at a time. origin. x = self. pageControl. currentPage * self. scrollView. frame. size. width; // set the view ordinate to 0 rect. origin. y = 0; // scrollView visible area [self. scrollView scrollRectToVisible: rect animated: YES];} # pragma mark ----- UIScrollViewDelegate --------- // method for implementing the UIScrollViewDelegate protocol, required-(void) implements :( UIScrollView *) scrollView {// obtain the current view width CGFloat pageWith = scrollView. frame. size. width; // Based on the left and right sliding of the scrolView, switch the current indicator of pageCotrol (set currentPage) int page = floor (scrollView. contentOffset. x-pageWith/2)/pageWith) + 1; // switch the page number and dot self. pageControl. currentPage = page;}-(void) didReceiveMemoryWarning {[super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated .} // release the created object-(void) dealloc {[_ pageControl release]; [_ scrollView release]; [super dealloc];}/* Ask hovertree.com */

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