为什么不设置此UISlider的value属性更新其位置？ [英] Why doesn't setting the value property of this UISlider update its position?

问题描述

... ViewController.h：

...ViewController.h:

@property (nonatomic, strong) IBOutlet UISlider *slider;

... ViewController.m：

...ViewController.m:

@synthesize slider;

- (void)viewDidLoad
{
    [super viewDidLoad];

    ...
    currentValue = 50;
    self.slider.value = currentValue;

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

.xib：

我界面中的UISlider连接到滑块属性。

The UISlider in my interface is connected to the slider property.

行为：

滑块全部当它应该在中间时，在价值100的右边的方式。我设置的操作确认currentValue的值为50.如果currentValue为50且slider.value设置为50，为什么位置不反映这个？

The slider sits all the way to the right at value 100 when it is supposed to be in the middle. An action I set up confirms the value of currentValue is 50. If currentValue is 50 and slider.value is set to 50, why doesn't the position reflect this?

PS我尝试了[slider setNeedsDisplay]并且它不会影响这种行为。

P.S. I tried [slider setNeedsDisplay] and it did not affect this behavior.

更新：感谢您的快速解答！多么愚蠢的事情。我在其他地方打印出currentValue为int，所以我现在用以下代码设置slider.value：

Update: thanks for the quick answers! What a silly thing to do. I print out currentValue as an int elsewhere so I am now setting slider.value with this code:

self.slider.value = (float) currentValue/100;

推荐答案

currentValue = 50;

滑块的范围是不 0 ... 100但是0 .. 0.1。你必须写

The slider's range is not 0...100 but 0...1. You have to write either

currentValue = 0.5;

或更改滑块的范围：

self.slider.maximumValue = 100;

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