Simple unlimited image carousel and unlimited carousel

Simple unlimited image carousel and unlimited carousel

1 # import "ViewController. h "2 # define kDeviceWidth [UIScreen mainScreen]. bounds. size. width 3 # define kDeviceHeight [UIScreen mainScreen]. bounds. size. height 4 # define Kpage 3 5 @ interface ViewController () <UIScrollViewDelegate> 6 7 @ property (nonatomic, strong) UIPageControl * pageCtrl; 8 @ property (nonatomic, weak) UIScrollView * scrollView; 9 @ property (nonatomic, weak) UIImageView * currentImageView ;// Current imageView 10 @ property (nonatomic, weak) UIImageView * nextImageView; // The next imageView 11 @ property (nonatomic, weak) UIImageView * preImageView; // previous imageView 12 @ property (nonatomic, assign) BOOL isDragging; // whether to drag 13 @ property (nonatomic, strong) NSTimer * timer; 14 @ end 15 16 @ implementation ViewController 17 18-(void) viewDidLoad {19 [super viewDidLoad]; 20 UIScrollView * scrollView = [UIScrol LView alloc] init]; 21 scrollView. frame = CGRectMake (0, 0, kDeviceWidth, kDeviceHeight); 22 [self. view addSubview: scrollView]; 23 self. scrollView = scrollView; 24 [self. scrollView setContentSize: CGSizeMake (kDeviceWidth * 3, kDeviceWidth)]; 25 // set to hide the horizontal bar 26 self. scrollView. showsHorizontalScrollIndicator = NO; 27 // set Automatic paging 28 self. scrollView. pagingEnabled = YES; 29 // set proxy 30 self. scrollView. delegat E = self; 31 // set the current vertex 32 self. scrollView. contentOffset = CGPointMake (kDeviceWidth, 0); 33 // set whether there is a boundary 34 self. scrollView. bounces = NO; 35 // initialize the current view 36 UIImageView * currentImageView = [[UIImageView alloc] init]; 37 currentImageView. image = [UIImage imageNamed: @ "bg_01"]; 38 [self. scrollView addSubview: currentImageView]; 39 self. currentImageView = currentImageView; 40 self. currentImageView. frame = CGR EctMake (kDeviceWidth, 0, kDeviceWidth, kDeviceHeight); 41 self. currentImageView. contentMode = UIViewContentModeScaleAspectFill; 42 // initialize the next view 43 UIImageView * nextImageView = [[UIImageView alloc] init]; 44 nextImageView. image = [UIImage imageNamed: @ "bg_02"]; 45 [self. scrollView addSubview: nextImageView]; 46 self. nextImageView = nextImageView; 47 self. nextImageView. frame = CGRectMake (kDeviceWidth * 2, 0, kDeviceWidth, kDeviceHeight); 48 self. nextImageView. contentMode = UIViewContentModeScaleAspectFill; 49 // initialize the previous view 50 UIImageView * preImageView = [[UIImageView alloc] init]; 51 preImageView. image = [UIImage imageNamed: @ "bg_03"]; 52 preImageView. frame = CGRectMake (0, 0, kDeviceWidth, kDeviceHeight); 53 [self. scrollView addSubview: preImageView]; 54 self. preImageView = preImageView; 55 self. pre ImageView. contentMode = UIViewContentModeScaleAspectFill; 56 57 // set the clock animation timer 58 59 self. timer = [NSTimer scheduledTimerWithTimeInterval: 2 target: self selector: @ selector (update :) userInfo: nil repeats: YES]; 60 // Add the timer to the main thread 61 [[[nsunloop mainRunLoop] addTimer: self. timer forMode: nsunloopcommonmodes]; 62 63} 64 // page 65-(UIPageControl *) pageCtrl {66 if (_ pageCtrl = nil) {67 68 // paging control 69 _ pageCtr L = [[UIPageControl alloc] init]; 70 _ pageCtrl. numberOfPages = Kpage; 71 72 CGSize size = [_ pageCtrl sizeForNumberOfPages: Kpage]; 73 _ pageCtrl. bounds = CGRectMake (0, 0, size. width, size. height); 74 _ pageCtrl. center = CGPointMake (self. view. center. x, CGRectGetMaxY (self. scrollView. frame)-20); 75 _ pageCtrl. pageIndicatorTintColor = [UIColor redColor]; 76 _ pageCtrl. currentPageIndicatorTintColor = [UICo Lor greenColor]; 77 78 [self. view addSubview: _ pageCtrl]; 79 80 81} 82 return _ pageCtrl; 83} 84 85 86-(void) updateTimer {87 // modify page number 88 int page = (self. pageCtrl. currentPage + 1) % Kpage; 89 self. pageCtrl. currentPage = page; 90 91} 92 93 94-(void) update :( NSTimer *) timer {95 // regularly move 96 97 if (_ isDragging = YES) {98 99 return; 100} 101 CGPoint offSet = self. scrollView. contentOffset; 102 offSet. x + = OffSet. x; 103 104 [self updateTimer]; 105 106 [self. scrollView setContentOffset: offSet Animation: YES]; 107 if (offSet. x> = kDeviceWidth x 2) {108 offSet. x = kDeviceWidth; 109} 110 111} 112 # pragma mark-UIScrollViewDelegate113-(void) scrollViewWillBeginDragging :( UIScrollView *) scrollView114 {115 _ isDragging = YES; 116} 117 // stop rolling 118-(void) scrollViewDidEndDecelerating :( UIScrollView *) scrollView119 {120 _ isDragging = NO; 121 122} 123 124 // start dragging 125-(void) scrollViewDidScroll :( UIScrollView *) scrollView {126 static int I = 1; // currently, the number of images displayed is 127 float offset = self. scrollView. contentOffset. x; 128 if (self. nextImageView. image = nil | self. preImageView. image = nil) {129 // load the next view 130 NSString * imageName1 = [NSString stringWithFormat: @ "bg_0% d", I = Kpage? 1: I + 1]; 131 _ nextImageView. image = [UIImage imageNamed: imageName1]; 132 // load the last view 133 NSString * imageName2 = [NSString stringWithFormat: @ "bg_0% d", I = 1? Kpage: I-1]; 134 _ preImageView. image = [UIImage imageNamed: imageName2]; 135 136} 137 if (offset = 0) {138 _ currentImageView. image = _ preImageView. image; 139 scrollView. contentOffset = CGPointMake (scrollView. bounds. size. width, 0); 140 _ preImageView. image = nil; 141 if (I = 1) {142 I = Kpage; 143} else {144 I-= 1; 145} 146 147} 148 if (offset = scrollView. bounds. size. width x 2) {149 _ currentImageView. image = _ nextImageView. image; 150 scrollView. contentOffset = CGPointMake (scrollView. bounds. size. width, 0); 151 _ nextImageView. image = nil; 152 if (I = Kpage) {153 I = 1; 154} else {155 I + = 1; 156} 157 158} 159 160} 161 162 163 @ end

Source file here: http://pan.baidu.com/s/1kVKrbkb

There is also a good third party: http://pan.baidu.com/s/1kUBTsZ9

If not, search for SDCycleScrollView-master in github.com.