UISlider不会自动重绘

问题描述

我有一个UISlider在我的应用程序，我需要有时不仅更新它的值，而且它的minimumValue。值被更改，但如果我调用setValue方法或为我的滑块分配一个新的值，它有新的值，但滑块不会重新绘制到它应该为这个新的值的位置。如何重新绘制？
这是一段我改变minimumValue的代码。

I've an UISlider on my app and I need sometimes to update not only its value but also its minimumValue. The values are changed but if I call the setValue method or assign a new value for my slider, it has the new value but the slider does not repaint itself to the position it should be for this new value. How can I repaint it?This is a piece of code where I change the minimumValue.

if([array count] < 50)
    [sliderTamanyo setMinimumValue:2];
else if([array count] < 200)
    [sliderTamanyo setMinimumValue:3];
else
    [sliderTamanyo setMinimumValue:4];
if(sliderTamanyo.value < sliderTamanyo.minimumValue)
     self.sliderTamanyo.value = self.sliderTamanyo.minimumValue;
[self.sliderTamanyo setNeedsDisplay];

推荐答案

我已经解决了，滑块到工具栏。我使用这个代码：

I've solved that by removing and adding again the slider to the toolbar. I've used this code:

NSMutableArray *items = [NSMutableArray arrayWithArray:self.toolbar.items];
id slider = [items lastObject];
[items removeLastObject];
self.toolbar.items = items;
[items addObject:slider];
self.toolbar.items = items;

我已使用 id 代替 UISlider ，因为该滑块位于 UIBarButtonItem

I've recovered my slider using an id instead an UISlider because that slider is inside a UIBarButtonItem

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