如何为单个段设置 UISegmentedControl 色调颜色 [英] How to set UISegmentedControl Tint Color for individual segment

问题描述

开始学习 Swift 并尝试转换此 ObjectiveC 代码:

Starting to learn Swift and am attempting to convert this ObjectiveC code:

[[mySegmentedControl.subviews objectAtIndex:0] setTintColor:[UIColor blueColor]]

这正确设置了第一段的色调.

This correctly sets the tint color of the first segment.

这是我最接近获得相同代码的 Swift 版本:

This is the closest I've come to getting a Swift version of the same code:

mySegmentedControl?.subviews[0].tintColor = UIColor.blueColor()

我得到的错误是 '@Ivalue $T9' 与 'UIColor!!' 不一样

我不明白这个错误是什么意思.当我查看 .tintColor 方法时，它列出了 UIColor!? 并且我还没有发现 !? 在 Swift 中一起意味着什么.

I don't understand what this error means. When I look at the .tintColor method it list UIColor!? and I haven't found what the !? together means in Swift yet.

推荐答案

这将解决您的问题:

var subViewOfSegment: UIView = mySegmentedControl.subviews[0] as UIView
subViewOfSegment.tintColor = UIColor.blueColor()

你也可以

(mySegmentedControl.subviews[0] as UIView).tintColor = UIColor .blueColor()

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