MPVolumeView滑块设置VolumeThumbImage：for State：不适用于iOS5

Question

o使用MPVolumeView显示音量滑块。我用

定制了它

        [myVolumeView setVolumeThumbImage:[UIImage imageNamed:@"sound_slider_knob.png"] forState:UIControlStateNormal];
        [myVolumeView setVolumeThumbImage:[UIImage imageNamed:@"sound_slider_knob.png"] forState:UIControlStateHighlighted];
        [myVolumeView setMaximumVolumeSliderImage:[UIImage imageNamed:@"slider_player_bg.png"] forState:UIControlStateNormal];
        [myVolumeView setMinimumVolumeSliderImage:[UIImage imageNamed:@"slider_player_fg.png"] forState:UIControlStateNormal];

在iOS6上一切正常，但在iOS5上，我收到此错误消息：

-[MPVolumeView setVolumeThumbImage:forState:]: unrecognized selector sent to instance 0x8c29f30
-[UIDevice identifierForVendor]: unrecognized selector sent to instance 0x8909b30

实际上，在MPVolumeView.h中有

- (void)setVolumeThumbImage:(UIImage *)image forState:(UIControlState)state NS_AVAILABLE_IOS(6_0);

有没有办法在iOS 5中自定义MPVolumeView？

Answer 1

在iOS 5及更早版本中，您必须搜索UISlider的MPVolumeView的子视图并自定义滑块。