Właśnie to zrobiłem. Mam szereg obrazów do dodania do przewijania, dlatego najpierw dodaję ostatnią do widoku przewijania, następnie przechodzę przez tablicę, aby dodać wszystkie obrazy, a następnie dodam pierwszy z tablicy ponownie.
Sprawdźcie przez ten kod:
#import "MainViewController.h"
#import "MainView.h"
#define WIDTH_OF_SCROLL_PAGE 320
#define HEIGHT_OF_SCROLL_PAGE 352
#define WIDTH_OF_IMAGE 320
#define HEIGHT_OF_IMAGE 352
#define LEFT_EDGE_OFSET 0
@implementation MainViewController
@synthesize scrollView, slideImages;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad {
scrollView = [[UIScrollView alloc] init];
CGRect scrollFrame;
scrollFrame.origin.x = 0;
scrollFrame.origin.y = 0;
scrollFrame.size.width = WIDTH_OF_SCROLL_PAGE;
scrollFrame.size.height = HEIGHT_OF_SCROLL_PAGE;
scrollView = [[UIScrollView alloc] initWithFrame:scrollFrame];
scrollView.bounces = YES;
scrollView.pagingEnabled = YES;
scrollView.delegate = self;
scrollView.userInteractionEnabled = YES;
slideImages = [[NSMutableArray alloc] init];
[slideImages addObject:@"welcome-small.jpg"];
[slideImages addObject:@"football-small.jpg"];
[slideImages addObject:@"dancing-small.jpg"];
[slideImages addObject:@"celebration-small.jpg"];
//add the last image first
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:[slideImages objectAtIndex:([slideImages count]-1)]]];
imageView.frame = CGRectMake(LEFT_EDGE_OFSET, 0, WIDTH_OF_IMAGE, HEIGHT_OF_IMAGE);
[scrollView addSubview:imageView];
[imageView release];
for (int i = 0;i<[slideImages count];i++) {
//loop this bit
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:[slideImages objectAtIndex:i]]];
imageView.frame = CGRectMake((WIDTH_OF_IMAGE * i) + LEFT_EDGE_OFSET + 320, 0, WIDTH_OF_IMAGE, HEIGHT_OF_IMAGE);
[scrollView addSubview:imageView];
[imageView release];
//
}
//add the first image at the end
imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:[slideImages objectAtIndex:0]]];
imageView.frame = CGRectMake((WIDTH_OF_IMAGE * ([slideImages count] + 1)) + LEFT_EDGE_OFSET, 0, WIDTH_OF_IMAGE, HEIGHT_OF_IMAGE);
[scrollView addSubview:imageView];
[imageView release];
[scrollView setContentSize:CGSizeMake(WIDTH_OF_SCROLL_PAGE * ([slideImages count] + 2), HEIGHT_OF_IMAGE)];
[scrollView setContentOffset:CGPointMake(0, 0)];
[self.view addSubview:scrollView];
[self.scrollView scrollRectToVisible:CGRectMake(WIDTH_OF_IMAGE,0,WIDTH_OF_IMAGE,HEIGHT_OF_IMAGE) animated:NO];
[super viewDidLoad];
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
int currentPage = floor((self.scrollView.contentOffset.x - self.scrollView.frame.size.width/([slideImages count]+2))/self.scrollView.frame.size.width) + 1;
if (currentPage==0) {
//go last but 1 page
[self.scrollView scrollRectToVisible:CGRectMake(WIDTH_OF_IMAGE * [slideImages count],0,WIDTH_OF_IMAGE,HEIGHT_OF_IMAGE) animated:NO];
} else if (currentPage==([slideImages count]+1)) {
[self.scrollView scrollRectToVisible:CGRectMake(WIDTH_OF_IMAGE,0,WIDTH_OF_IMAGE,HEIGHT_OF_IMAGE) animated:NO];
}
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[scrollView release];
[slideImages release];
[super dealloc];
}
@end
Następnie używać scrollViewDidEndDecelerating aby sprawdzić, gdzie w zwoju użytkownik jest, a następnie przeskoczyć je do 2 obrazu lub last but 1 obrazek aby mogli przewinąć ciągły ... Przepraszam, jeśli nie wyjaśniłem tego dobrze - niedługo! Ale ten kod działa dobrze na moim urządzeniu.
Lepszym sposobem opisu byłoby * okrągłe * (IMO). – mk12