UISLider设置thumb/minimumTrack/maximumTrack色调颜色出现异常

Question

根据developer.apple，我应该能够设置UISLider的属性-thumbTintColor/minimumTrackTintColor/maximumTrackTintColor-参考http://developer.apple.com/library/IOs/#documentation/UIKit/Reference/UISlider_Class/Reference/Reference.html

但是设置任何这些属性都会引发“无法识别的选择器发送到实例”异常。

我知道可以通过设置图像属性来解决此问题。但我不想走那条路。我有什么遗漏的吗？

请提供任何帮助。提前致谢。

这是来自developer.apple示例的UICatalog项目的代码：

- (UISlider *)sliderCtl
{
    if (sliderCtl == nil) 
    {
        CGRect frame = CGRectMake(174.0, 12.0, 120.0, kSliderHeight);
        sliderCtl = [[UISlider alloc] initWithFrame:frame];
        [sliderCtl addTarget:self action:@selector(sliderAction:) forControlEvents:UIControlEventValueChanged];

        // in case the parent view draws with a custom color or gradient, use a transparent color
        sliderCtl.backgroundColor = [UIColor clearColor];

        // I just added this following line to test
        sliderCtl.thumbTintColor = [UIColor yellowColor];

        sliderCtl.minimumValue = 0.0;
        sliderCtl.maximumValue = 100.0;
        sliderCtl.continuous = YES;
        sliderCtl.value = 50.0;

        // Add an accessibility label that describes the slider.
        [sliderCtl setAccessibilityLabel:NSLocalizedString(@"StandardSlider", @"")];

        sliderCtl.tag = kViewTag;   // tag this view for later so we can remove it from recycled table cells
    }
    return sliderCtl;
}

Answer 1

您正在尝试在非 iOS5 设备/模拟器上执行此操作。您要使用的API仅在iOS5上可用。