UISLider设置拇指/ minimumTrack/maximumTrack着色颜色变得异常

Question

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

但设置这些属性引发“无法识别的选择发送到实例“异常。

我知道这是通过设置图像属性的解决方法。但我不想那样。有什么我失踪？

请任何帮助表示赞赏。提前致谢。

这里是从developer.apple例子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

您正在试图做到这一点上没有的iOS5设备/模拟器。您要使用的API仅在iOS5上可用。