UIScollerView&UIPageControl的一些使用方法

- (void)viewDidLoad

{

    CGRect rec = [[UIScreen mainScreen] bounds];

     mainScrollView= [[UIScrollView alloc] initWithFrame:rec];

        //設置實際內容區域大小（當前爲水平滾動,高度設置爲0是禁止垂直方向滾動）

    picsScrollView.contentSize = CGSizeMake(rect.size.width * 4, 0);

     picsScrollView.backgroundColor = [UIColor blackColor];

     //當值是 YES 會自動滾動到 subview 的邊界。默認是NO(至關於啓用分頁功能，滾動視圖爲頁面翻轉效果)

    picsScrollView.pagingEnabled = YES;

    //滾動時是否顯示水平滾動條，默認爲YES

 picsScrollView.showsHorizontalScrollIndicator = NO;

    mainScrollView.delegate = self;

    

    [self.view addSubview:mainScrollView];

    //定義圖片數組

    self.imageArray = [NSArray arrayWithObjects:[UIImage imageNamed:@"1.jpg"],

                                                [UIImage imageNamed:@"2.png"],

                                                [UIImage imageNamed:@"3.jpg"], nil];

    [self settingScrollView];

    

    //分頁控件

    pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, 400, 320, 0)];

    

    pageControl.numberOfPages = [self.imageArray count];

//    pageControl.pageIndicatorTintColor = [UIColor redColor];

//    pageControl.currentPageIndicatorTintColor = [UIColor blueColor];

    [self scrollViewDidScroll:mainScrollView];  

    

    [self.view addSubview:pageControl];

    

    self.navigationController.navigationBarHidden = NO;

    

    [super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

}

#pragma mark-自定義方法

-(void)settingScrollView

{

    for (int i=0; i<3; i++) {

        UIImageView *imageView = [[UIImageView alloc] initWithImage:[self.imageArray objectAtIndex:i]];

        

        imageView.frame = CGRectMake(i*mainScrollView.frame.size.width, 0, mainScrollView.frame.size.width, mainScrollView.frame.size.height);

        [mainScrollView addSubview:imageView];

    }

}

#pragma mark - scollerView協議方法

-(void)scrollViewDidScroll:(UIScrollView *)scrollView

{

//    self.navigationItem.title = [NSString stringWithFormat:@"(%.2f,%.2f)",scrollView.contentOffset.x,scrollView.contentOffset.y];

    

    NSInteger pageInt = scrollView.contentOffset.x / scrollView.frame.size.width;

    

    self.navigationItem.title = [NSString stringWithFormat:@"第%d張",pageInt+1];

    pageControl.currentPage = pageInt;

    pageControl.currentPageIndicatorTintColor = [UIColor blueColor];

}

期間

1，由於定義的UIScrollerView的實例變量爲scrollView和委託方法中傳入的參數重名，致使出現了下面的警告：Local declaration of 'scrollView' hides instance variable

2，由於粗心誤認爲UIScrollerView不須要實現協議，

3，scrollView.contentOffset指的是每一張內容顯示界面左上角的座標，

4，UIPageControll和UIScrollerView之間沒有什麼聯繫，