iOS 轮播图

- (void)viewDidLoad {

[super
viewDidLoad];

self.view.backgroundColor = [UIColor
blackColor];

self.scrollView = [[UIScrollView
alloc] initWithFrame:CGRectMake(0, Screen_Height /
2 - 100, Screen_Width,
200)];

// self.scrollView.backgroundColor = [UIColor redColor];

self.scrollView.delegate =
self;

[self.view
addSubview:_scrollView];

//
内容大小

self.scrollView.contentSize =
CGSizeMake(Screen_Width * 8,
64);

//
启用分页

self.scrollView.pagingEnabled =
YES;

//
显示水平滚动指标

self.scrollView.showsHorizontalScrollIndicator =
NO;

//
设置内容抵消

[self.scrollView
setContentOffset:CGPointMake(Screen_Width,
0) animated:YES];

self.automaticallyAdjustsScrollViewInsets =
NO;

self.pageVC = [[UIPageControl
alloc] initWithFrame:CGRectMake(Screen_Width /
7, self.scrollView.frame.origin.y
+ self.scrollView.frame.size.height -
30, Screen_Width /
1.5,
20)];

// self.pageVC.currentPage = 0;

self.pageVC.pageIndicatorTintColor = [UIColor
lightGrayColor];

self.pageVC.currentPageIndicatorTintColor = [UIColor
blueColor];

self.pageVC.numberOfPages =
6;

self.array = [NSMutableArray
arrayWithObjects:@"img00@2x.png",@"img01@2x.png",
@"img02@2x.png",@"img03@2x.png",@"img04@2x.png",@"img05@2x.png",nil];

//
设置 的
第一张 图片

id firstImage = [self.array
firstObject];

//
设置 的
最后 一张
图片

id lastImage = [self.array
lastObject];

//
把第一张图片 加在
数组中

[self.array
insertObject:lastImage atIndex:0];
[self.array
addObject:firstImage];

for (int i =
0; i < 8; i++) {

// self.scro = [[UIScrollView alloc] initWithFrame:CGRectMake(Screen_Width * i, 0, Screen_Width, Screen_Height)];

//

//

//

// self.scro.delegate = self;

//

//// self.scro.center = CGPointMake(self.scrollView.frame.size.width / 2, self.scrollView.frame.size.height / 2);

//

// //设置最大伸缩比例

// self.scro.maximumZoomScale=2.0;

// //设置最小伸缩比例

// self.scro.minimumZoomScale=0.5;

//

//

// [self.view addSubview:self.scro];

self.homeImageView = [[UIImageView
alloc] initWithFrame:CGRectMake(Screen_Width * i,
0, Screen_Width, Screen_Height /
3)];

self.homeImageView.image = [UIImage
imageNamed:@"himages_01.png"];

[self.scrollView
addSubview:self.homeImageView];

}

[self.view
addSubview:self.pageVC];
[self
addtimer];

}
-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{

return
self.homeImageView;
}
-(NSUInteger)supportedInterfaceOrientations{

return
UIInterfaceOrientationMaskLandscapeRight;
}
- (void)addtimer
{

self.timer = [NSTimer
scheduledTimerWithTimeInterval:3.5
target:self
selector:@selector(timerAction)
userInfo:nil
repeats:YES];

}
- (void)timerAction
{

CGFloat x = (self.myIndex +
1) *
self.scrollView.frame.size.width;

[self.scrollView
setContentOffset:CGPointMake(x,
0) animated:YES];

if (self.myIndex ==
7) {

CGFloat x =
1 *
self.scrollView.frame.size.width;

[self.scrollView
setContentOffset:CGPointMake(x,
0) animated:NO];

self.myIndex = -1;

}

self.myIndex ++;

}

//滑动结束
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{

if (self.scrollView.contentOffset.x
>= self.scrollView.frame.size.width * (8
- 1)) {

//
显示用户看到的第一页 也就是数组中的第二张

[self.scrollView
setContentOffset:CGPointMake(self.scrollView.frame.size.width
- 1,
0) animated:NO];

}

if (self.scrollView.contentOffset.x
<= 0) {

//
如果当前偏移量小于等于0的时候

[self.scrollView
setContentOffset:CGPointMake(self.scrollView.frame.size.width
* (8 -
2), 0)
animated:NO];
}

}

//将要开始拖缀

-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{

[self
removeTimer];

}

// 结束拖缀
-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{

if (self.timer ==
nil) {
[self
addtimer];

}
}

// 滑动时
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{

//
当页面页面滑动一半的时候 就改变页数

int X = scrollView.frame.size.width/2;

NSInteger index = (scrollView.contentOffset.x -
self.scrollView.frame.size.width - X) / (scrollView.frame.size.width)
+ 1;

self.pageVC.currentPage = index;

self.myIndex =
self.pageVC.currentPage;

if (index == 6) {

[self.pageVC
setCurrentPage:0];

self.myIndex =
7;
}

}
-(void)removeTimer
{

[self.timer
invalidate];

self.timer =
nil;
}