輪播引導頁

輪播引導頁早已成為主流的引導方式，下面加單介紹一下實現方式。

界面預覽：

GuidePages.gif

代碼簡介：
主要知識點：
UIScrollView 基礎控件的使用

    (instancetype)init
    {
return [self initWithImageDatas:nil completion:nil];
    }

    // init with imageDatas and completion     - (instancetype)initWithImageDatas:(NSArray *)imageDatas completion:(void (^)(void))buttonAction
    {
self = [super init];
if (self)
{
    [self initView];
    //因為使用了懶加載，_imageDatas = imageDatas不會調用initContentView
    [self setImageDatas:imageDatas];
    _buttonAction = buttonAction;
}
return self;
    }

    //懶加載，并初始化內容- (void)setImageDatas:(NSArray *)imageDatas
    {
_imageDatas = imageDatas;
[self initContentView];
    }

    //基礎視圖初始化- (void)initView
    {
// init view
self.frame = CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);

// init scrollView
_scrollView = [[UIScrollView alloc] init];
_scrollView.delegate = self;
_scrollView.frame = CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
_scrollView.backgroundColor = [UIColor clearColor];
_scrollView.bounces = NO;
_scrollView.pagingEnabled = YES;
_scrollView.showsHorizontalScrollIndicator = NO;
[self addSubview:_scrollView];

// init pageControl
_pageControl =
    [[UIPageControl alloc] initWithFrame:CGRectMake(0, SCREEN_HEIGHT - 30, SCREEN_WIDTH, 10)];
_pageControl.currentPage = 0;
_pageControl.hidesForSinglePage = YES;
_pageControl.pageIndicatorTintColor = [UIColor grayColor];
_pageControl.currentPageIndicatorTintColor = [UIColor whiteColor];
[self addSubview:_pageControl];

// init button
_actionButton = [UIButton buttonWithType:UIButtonTypeCustom];
    }

    //指定數據后，初始化顯示內容- (void)initContentView
   {
if (_imageDatas.count)
{
    _pageControl.numberOfPages = _imageDatas.count;
    _scrollView.contentSize = CGSizeMake(SCREEN_WIDTH * _imageDatas.count, SCREEN_HEIGHT);
    for (int i = 0; i < _imageDatas.count; i++)
    {
        NSString *imageName = _imageDatas[i];
        UIImageView *imgView =
            [[UIImageView alloc] initWithImage:[UIImage imageNamed:imageName]];
        imgView.frame = CGRectMake(SCREEN_WIDTH * i, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
        [self.scrollView addSubview:imgView];

        if (i == _imageDatas.count - 1)
        {
            _actionButton.frame =
                CGRectMake(SCREEN_WIDTH / 2 - 70, SCREEN_HEIGHT - 70, 140, 35);
            _actionButton.layer.cornerRadius = 5;
            _actionButton.layer.masksToBounds = YES;
            [_actionButton setTitle:@"進  入" forState:UIControlStateNormal];
            _actionButton.tintColor = [UIColor whiteColor];
            _actionButton.backgroundColor = [UIColor redColor];
            [_actionButton addTarget:self
                              action:@selector(enterButtonClick)
                    forControlEvents:UIControlEventTouchUpInside];
            [imgView addSubview:_actionButton];
            //設置可以響應交互，UIImageView的默認值為NO
            imgView.userInteractionEnabled = YES;
        }
    }
}
   }- (void)enterButtonClick
   {
if (_buttonAction)
{
    _buttonAction();
}
   }- (void)scrollViewDidScroll:(UIScrollView *)scrollView
   {
_pageControl.currentPage = (_scrollView.contentOffset.x + SCREEN_WIDTH / 2) / SCREEN_WIDTH;
    }

下載地址：
http://pan.baidu.com/s/1c24pBwO