IOS development-Carousel image module (Basic Edition)

IOS development-Carousel image module (Basic Edition)

// Use ScrollView to implement image carousel // ViewController. m // Slider-Carousel /// Created by JamesXiang on 15/7/21. // Copyright (c) 2015 JamesXiang. all rights reserved. // # import ViewController. h @ interface ViewController ()
 
  
@ Property (nonatomic, strong) UIScrollView * scrollView; @ property (nonatomic, strong) UIPageControl * pageControl; @ property (nonatomic, assign) int sliderIndex; @ property (nonatomic, strong) NSTimer * timer; @ property (nonatomic, assign) int count; @ property (nonatomic, assign) double sliderWidth; @ property (nonatomic, assign) double sliderHeight; @ end @ implementation ViewController-(void) viewDidLoad {[super viewDidLoad]; // only one entry is left, and the program decouples [self loadSlider];}-(void) loadSlider {[self setParam]; // set the relevant parameter [self loadSliderContainer]; // load the carousel container [self loadSliderItem]; // load the carousel content [self loadPageController]; // load slideshow [self sliderBegin]; // carousel start}-(void) setParam {self. sliderIndex = 0; // start index self. count = 5; // Number of carousel images self. sliderWidth = self. view. frame. size. width; // slider width self. sliderHeight = 160; // slider height} // set the carousel container-(void) loadSliderContainer {// The visible width of scrollView cannot be set to the total width of the content, this will cause failure to scroll UIScrollView * scrollView = [[UIScrollView alloc] initWithFrame: CGRectMake (0, 20, self. sliderWidth, self. sliderHeight)]; // sets the page-scrolling scrollView. pagingEnabled = YES; // hide the horizontal scroll bar scrollView. showsHorizontalScrollIndicator = NO; scrollView. delegate = self; scrollView. contentSize = CGSizeMake (self. sliderWidth * self. count, self. sliderHeight); self. scrollView = scrollView; [self. view addSubview: scrollView];} // sets the carousel content-(void) loadSliderItem {for (int I = 0; I <self. count; I ++) {UIImageView * imgView = [[UIImageView alloc] initWithFrame: CGRectMake (self. sliderWidth * I, 0, self. sliderWidth, self. sliderHeight)]; imgView. userInteractionEnabled = YES; // Add a gesture recognition listener to the imageView [imgView addGestureRecognizer: [[UITapGestureRecognizer alloc] initWithTarget: self action: @ selector (sliderClick)]; UIImage * img = [UIImage imageNamed: [NSString stringWithFormat: @slider+d.jpg, I]; imgView. image = img; [self. scrollView addSubview: imgView, the specific solution has not yet come up with/* UIButton * btn = [[UIButton alloc] initWithFrame: CGRectMake (self. sliderWidth * I, 0, self. sliderWidth, self. sliderHeight)]; btn. tag = I; [btn addTarget: self action: @ selector (sliderClick :) forControlEvents: role]; [btn labels: [UIImage imageNamed: [NSString stringWithFormat: @slider%d.jpg, I] forState: UIControlStateNormal]; // click the highlighted State [btn setBackgroundImage: [UIImage imageNamed: [NSString stringWithFormat: @slider%d.jpg, I] forState: UIControlStateHighlighted]; [self. scrollView addSubview: btn]; */}-(void) sliderClick {NSLog (@ click event ...); // here you can use index to control click events for each image} // load pageControl-(void) loadPageController {UIPageControl * pageControl = [[UIPageControl alloc] initWithFrame: CGRectMake (0,160, self. sliderWidth, 20)]; pageControl. numberOfPages = self. count; pageControl. currentPage = 0; pageControl. hidesForSinglePage = YES; _ pageControl = pageControl; [self. view addSubview: pageControl];} // start carousel-(void) sliderBegin {self. timer = [NSTimer scheduledTimerWithTimeInterval: 2.5 target: self selector: @ selector (autoChangeImg) userInfo: nil repeats: YES];} // switch the carousel image and button-(void) autoChangeImg {self. sliderIndex ++; if (self. sliderIndex = 5) {self. sliderIndex = 0;} [UIView animateWithDuration: 0.8 animations: ^ {self. scrollView. contentOffset = CGPointMake (self. sliderIndex * self. sliderWidth, 0); [self updateSliderIndex];} // update the current carousel index-(void) updateSliderIndex {self. sliderIndex = self. scrollView. contentOffset. x/self. sliderWidth; self. pageControl. currentPage = self. sliderIndex;}-(void) scrollViewWillBeginDragging :( UIScrollView *) scrollView {[self. timer invalidate];}-(void) scrollViewDidEndDragging :( UIScrollView *) scrollView willDecelerate :( BOOL) decelerate {[self sliderBegin];}-(void) skip :( UIScrollView *) scrollView {[self updateSliderIndex];} @ end