How to Change the UISlider to Vertical?

2019-03-17 10:46发布

I am customizing an UISlider for my app. I want the slider to be in vertical orientation, but the default UISlider is in horizontal orientation. I couldn't find how to change a UISlider's orientation.

How can I make a vertical slider in XCode?

3条回答
我欲成王,谁敢阻挡
2楼-- · 2019-03-17 11:26

In case you are using auto layouts:

In your viewDidLoad, try:

UIView *superView = self.sizeSlider.superview;
[self.sizeSlider removeFromSuperview];
[self.sizeSlider removeConstraints:self.view.constraints];
self.sizeSlider.translatesAutoresizingMaskIntoConstraints = YES;
self.sizeSlider.transform = CGAffineTransformMakeRotation(M_PI_2);
[superView addSubview:self.sizeSlider];

It does not work with constraints, so the trick is to remove the constraints for your uislider. You might have to resize it manually by setting its frame property.

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爷、活的狠高调
3楼-- · 2019-03-17 11:27

By default, a UISlider is horizontal (--). If you wish to make it vertical (|) then you must do this programmatically, probably with a CGAffineTransform. For example, you can add this snippet to viewDidLoad or wherever you deem appropriate:

CGAffineTransform trans = CGAffineTransformMakeRotation(M_PI_2);
slider.transform = trans;
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我命由我不由天
4楼-- · 2019-03-17 11:33

I had a problem with :

CGAffineTransform trans = CGAffineTransformMakeRotation(M_PI_2);
slider.transform = trans;

because I had the code in ViewDidLoad method. Instead, I put the code in ViewDidAppear and it worked fine.

Edit: it doesn't have to be in the ViewDidAppear, ViewDidLoad works fine too (even better). You could disable auto-resize, or set a constraint for the slider you're rotating so the size doesn't change after rotation.

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