如何在iPhone中使用滑块代替Scrollviewer垂直条？

我使用的是滑块控件，而不是Scrollviewer垂直条。 但它不能正常工作

scrollViewer.contentSize = CGSizeMake(320, (ThumbnailSizeHeight + PADDING) * [list count]);
slider.maximumValue =  (ThumbnailSizeHeight + PADDING) * [list count];  

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请纠正我

在

contentSize

大于滚动查看器的帧大小之前，您不需要滚动。所以

CGFloat scrollableHeight = (ThumbnailSizeHeight + PADDING) * [list count] - scrollViewer.frame.size.height;
if ( scrollableHeight <= 0 ) {
    slider.enabled = NO; // or use the `hidden` property
} else {
    slider.enabled = YES; // or .hidden based on what you do in `if`
    slider.maximumValue = scrollableHeight;
}

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说实话可不是那么简单。@Sezhian这有帮助吗？你需要进一步的帮助吗？

- (IBAction)sliderValueChanged:(UISlider *)slider {
    scrollViewer.contentOffset = CGPointMake(0, slider.value);
}