如何制作UISlider的“赛道”无形？ [英] How to make UISlider's "track" invisible?

问题描述

我正试图在我的应用程序中模仿Apple的Slide to Unlock功能。我到达这一点（下图），但正如你所看到的那样，UISlider的轨道是可见的并且掩盖了我的文字。有没有办法以编程方式更改属性，使轨道不可见？

I'm trying to emulate Apple's "Slide to Unlock" feature in my application. I get to this point (image below), but as you can see the UISlider's "track" is visible and is covering up my text. Is there a way to change an attribute programmatically that will make the "track" invisible?

如果您需要我的任何代码，请告诉我。

Please let me know if you need any of my code.

提前致谢！

编辑：如果我将滑块的alpha更改为0，它会摆脱我的滑动按钮，这样做不会起作用，除非我做错了。 ：）

If I change the slider's alpha to 0, it gets rid of my sliding button, so doing that won't work unless I'm doing it wrong. :)

推荐答案

实际上我只想出来了。这就是我做的：

Actually I just figured it out. Here's what I did:

UIImage *sliderMinimum = [[UIImage imageNamed:@"clearTrack.png"] stretchableImageWithLeftCapWidth:4 topCapHeight:0];
[slider setMinimumTrackImage:sliderMinimum forState:UIControlStateNormal];
UIImage *sliderMaximum = [[UIImage imageNamed:@"clearTrack.png"] stretchableImageWithLeftCapWidth:4 topCapHeight:0];
[slider setMaximumTrackImage:sliderMaximum forState:UIControlStateNormal];

clearTrack.png 只是一个清晰的滑块我做的图像。

clearTrack.png is just a clear slider image I made.

现在我有了这个：耶！

Now I have this: yay!

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