#define IMAGECOUNT 6
/**
* 設置scrollView
*/
-(void)setupScrollView
{
CGRect rect = [UIScreen mainScreen].bounds;
self.size = rect.size;
self.scrollView = [[UIScrollView alloc]initWithFrame:rect];
[self.scrollView setContentSize:CGSizeMake(self.size.width * IMAGECOUNT, self.size.height)];
[self.scrollView setShowsHorizontalScrollIndicator:NO];
[self.scrollView setPagingEnabled:YES];
[self.scrollView setDelegate:self];
[self.scrollView setContentOffset:CGPointMake(self.size.width, 0)];
[self.view addSubview:self.scrollView];
[self setupPic];
}
/**
* 設置圖片
*/
-(void)setupPic
{
CGFloat x = 0;
CGFloat y = 0;
CGFloat w = self.size.width;
CGFloat h = self.size.height;
for (NSInteger i = 0; i < IMAGECOUNT; i++) {
UIImage *image = nil;
if (i == 0) {
//在第一張圖片之前放最後一張圖片
image = [UIImage imageNamed:@"new_feature_4"];
}
else if (i + 1 == IMAGECOUNT) {
//在最後一張圖片之後放第一張圖片
image = [UIImage imageNamed:@"new_feature_1"];
}
else{
image = [UIImage imageNamed:[NSString stringWithFormat:@"new_feature_%ld",i]];
}
x = i * w;
UIImageView *imageView = [[UIImageView alloc]initWithImage:image];
[imageView setFrame:CGRectMake(x, y, w, h)];
[self.scrollView addSubview:imageView];
}
}
-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGFloat x = scrollView.contentOffset.x;
//當滑動到最後一張時，也就是第一張，設置scrollView的x偏移
if ((x + self.size.width) >= scrollView.contentSize.width) {
[scrollView setContentOffset:CGPointMake(self.size.width, 0)];
}
//當滑動到第一張時，就是最後一張，設置scrollView的x偏移
if (x == 0) {
[scrollView setContentOffset:CGPointMake(self.size.width * 4, 0)];
}
}