Question

根据developer.apple，我应该可以设置UISLider的属性 - thumbTintColor / minimumTrackTintColor / maximumTrackTintColor - reference http://developer.apple.com/library/IOs/#documentation/UIKit/Reference/UISlider_Class/Reference/Reference.html

但设置任何这些属性会引发“无法识别的选择器发送到实例”异常。

我知道通过设置图像属性可以解决此问题。但我不想那样走。有什么我想念的吗？

请任何帮助表示赞赏。提前谢谢。

以下是developer.apple示例的UICatalog项目代码：

- (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

您试图在非iOS5设备/模拟器上执行此操作。您要使用的API仅适用于iOS5。

UISLider设置thumb / minimumTrack / maximumTrack色调颜色获得异常

1 个答案: