Iphone 如何在使用带滚动的pagecontrol时识别当前页面索引？

我正在使用带有滚动功能的pagecontrol

在该页面控件中，我创建了3个标签和两个按钮

现在我想在单击按钮的同时执行功能。为此，我如何识别

执行按钮单击事件时显示当前页面

通过点击按钮，我想显示另一个已经创建的标签，但在该位置

时间是隐藏的。请引导我

以下是在pagecontrol中创建对象的代码：

         UILabel *lblReward=[[UILabel alloc]initWithFrame:pageFrame];
    [lblReward setFrame:CGRectMake(i * (scrollView.bounds.size.width)+60, 200, 200, 25)];
    lblReward.backgroundColor=[UIColor clearColor];
    lblReward.textColor=[UIColor whiteColor];
    [scrollView addSubview:lblReward];
    NSString *strReward=[[pageControlData objectAtIndex:i]objectForKey:@"Reward"];

    NSLog(@"strDetails=%@",strReward);
    [lblReward setText:strReward];
    [lblReward release];

       UIButton  *btnCheckButton=[[UIButton alloc]initWithFrame:pageFrame ];
    [ btnCheckButton setFrame:CGRectMake(i * (scrollView.bounds.size.width)+250, 260, 20, 20)];
    [btnCheckButton setImage:[UIImage imageNamed:@"NO.png"] forState:UIControlStateNormal];

    [btnCheckButton addTarget:self action:@selector(checkBoxClicked:) forControlEvents:UIControlEventTouchUpInside];


    [scrollView addSubview:btnCheckButton];
    [btnCheckButton release];  


    UIButton  *backButton=[[UIButton alloc]initWithFrame:pageFrame ];


    [ backButton setFrame:CGRectMake(i * (scrollView.bounds.size.width)+10, 410, 30, 30)];
    [backButton setImage:[UIImage imageNamed:@"Arrow Icon.png"] forState:UIControlStateNormal];
    [backButton addTarget:self action:@selector(backButtonClicked) forControlEvents:UIControlEventTouchUpInside];

    [scrollView addSubview:backButton];
    [backButton release];  


    UIButton  *showcaseButton=[[UIButton alloc]initWithFrame:pageFrame ];
    [ showcaseButton setFrame:CGRectMake(i * (scrollView.bounds.size.width)+270, 410, 30, 30)];
    [showcaseButton setImage:[UIImage imageNamed:@"Showcase Icon.png"] forState:UIControlStateNormal];

    [showcaseButton addTarget:self action:@selector(showcaseButtonClicked) forControlEvents:UIControlEventTouchUpInside];

    [scrollView addSubview:showcaseButton];
    [showcaseButton release];  


}

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现在我想通过单击checkButton来显示labelreward。

您可以通过以下方式获得页面控件的当前页码：-

int currentPageNo=[*yourPageControlObjectName*.currentPage];

来自苹果文档：-

currentPage

当前页面，由接收器显示为白点

@property(nonatomic) NSInteger currentPage

讨论

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属性值是一个整数，指定显示的当前页面减去1；因此，值为零（默认值）表示第一页。页面控件将当前页面显示为白点。超出可能范围的值固定为0或numberOfPages减去1。

使用scrollview的contentOffset属性确定页面。例如：

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

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谢谢为我工作。