xcode ios：如何获取当前的索引？ UIscrollView 页面
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ios: how to get index of current ?UIscrollView page
提问by user1564754
I want to know index of current scrolled page in UIScrollView. I have searched through many sites by none helps. Any suggestions are welcome.
我想知道 UIScrollView 中当前滚动页面的索引。我已经搜索了许多网站，但没有任何帮助。欢迎任何建议。
回答by Lithu T.V
Try this
尝试这个
//Horizontal
NSInteger pagenumber = scrollView.contentOffset.x / scrollView.bounds.size.width;
//Vertical
NSInteger pagenumber = scrollView.contentOffset.y / scrollView.bounds.size.height;
回答by Mindeater
For those needing code (swift) , the UIScrollViewDelegate provides the method, this uses the horizontal example from above
对于那些需要代码 (swift) 的人， UIScrollViewDelegate 提供了方法，这使用了上面的水平示例
func scrollViewDidEndDecelerating(scrollView: UIScrollView) {
print("END Scrolling \(scrollView.contentOffset.x / scrollView.bounds.size.width)")
index = Int(scrollView.contentOffset.x / scrollView.bounds.size.width)
}
回答by craigmj
Use the contentOffsetproperty, which returns a CGSizethat is the offset of the content in the UIScrollView.
使用contentOffset属性，它返回CGSize.a 中内容的偏移量UIScrollView。
回答by Mohd Kalimullah Sheikh
with the help of some mathematical calculation you can get index number of page I am sending code for reference only . I have done.
在一些数学计算的帮助下，您可以获得页面的索引号我发送的代码仅供参考。我已经做好了。
-(void)KinarafindingSelectedCategory:(UIScrollView*)scrollView{
for (UIView *v in scrollView.subviews)
{
if ([v isKindOfClass:[UIButton class]])
{
UIButton *btn=(UIButton*)v;
float x1=scrollView.contentOffset.x+(([UIScreen mainScreen].bounds.size.width/2)-(btn.frame.size.width/2));
float x2=scrollView.contentOffset.x+(([UIScreen mainScreen].bounds.size.width/2)+(btn.frame.size.width/2));
float BtnMidPoint=btn.frame.origin.x+(btn.frame.size.width/2);
if(BtnMidPoint >= x1 && BtnMidPoint <= x2)
{
if(scrollView==KinaraCategory)
{
KinaraSelectedCategoryName=btn.titleLabel.text;
KinaraSelectedCategoryID=btn.tag;
NSLog(@"Selected Category Tag : %d",KinaraSelectedCategoryID);
NSLog(@"Selected Category Name : %@",KinaraSelectedCategoryName);
}
else if(scrollView==KinaraSubCategory)
{
KinaraSelectedSubCategoryID=btn.tag;
KinaraSelectedSubCategoryName=btn.titleLabel.text;
NSLog(@"Selected SubCategory Tag : %d",KinaraSelectedSubCategoryID);
NSLog(@"Selected SubCategory Name : %@",KinaraSelectedSubCategoryName);
}
break;
}
}
}
}
