创建自定义标签栏 [英] Creating a Custom Tab Bar

问题描述

我想在顶部创建一个自定义标签栏.就像9gag一样.你知道我可以学习如何做的地方吗?(文档或视频教程)谢谢9gag 自定义标签栏

I want to create a custom tab bar at the top. Just like 9gag. Do you know a place where i can learn how to do it? (documentiation or video tutorial) Thanks 9gag custom tab bar

推荐答案

我实施的一项工作.

1. 创建一个具有自定义标签栏的视图.

1. Create a view to have the custom tab bar.

let tabView = UIView(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: 60))
tabView.backgroundColor = UIColor(red: 45/255, green: 58/255, blue: 114/255, alpha: 1)
self.view.addSubview(tabView)

根据按钮的数量，决定按钮的大小并将它们添加为子视图.(此处取 2 个)

Depending on the number of buttons, decide the button size and add them as subview.(Taking 2 here)

firstButton = UIButton(type: .Custom)
firstButton.frame = CGRect(x: 0, y: 20, width: tabView.frame.size.width / 2, height: 30)
firstButton.setTitle("BUT 1", forState: .Normal)
firstButton.setTitleColor(UIColor(red: 0/255, green: 191/255, blue: 165/255, alpha: 1.0), forState: .Normal)
firstButton.addTarget(self, action: #selector(ViewController.firstButtonTapped), forControlEvents: .TouchUpInside)

tabView.addSubview(firstButton)

secondButton = UIButton(type: .Custom)
secondButton.frame = CGRect(x: tabView.frame.size.width / 2, y: 20, width: tabView.frame.size.width / 2, height: 30)
secondButton.setTitle("BUT 2", forState: .Normal)
secondButton.setTitleColor(UIColor.whiteColor(), forState: .Normal)
secondButton.addTarget(self, action: #selector(ViewController.secondButtonTapped), forControlEvents: .TouchUpInside)

tabView.addSubview(secondButton)

添加一个小的 UIView，作为按钮下方的一行.

Add a small UIView which serves as a line below the buttons.

 lineView = UIView()
lineView.frame = CGRect(x: 0, y: CGRectGetMaxY(tabView.frame) - 3, width: tabView.frame.size.width / 2, height: 3)
lineView.backgroundColor = UIColor(red: 0/255, green: 191/255, blue: 165/255, alpha: 1.0)

tabView.addSubview(lineView)

在滚动视图中创建下面的视图.

Make the view below in a scrollview.

 self.scrollView.frame = CGRectMake(0, CGRectGetMaxY(tabView.frame), self.view.frame.width, self.view.frame.height)
self.scrollView.backgroundColor = UIColor.whiteColor()
self.scrollView.delegate = self
self.scrollView.pagingEnabled = true

self.view.addSubview(self.scrollView)

let aScrollViewWidth = self.scrollView.frame.width
let aScrollViewHeight = self.scrollView.frame.height
self.scrollView.contentSize = CGSizeMake(aScrollViewWidth * CGFloat(2), aScrollViewHeight)

一个接一个地添加你的观点.为了这个例子，我只是添加了一个 UITextView.

Add your views one after the other. For the sake of the example, I am just adding a UITextView.

for anIndex in 0  ..< 2  {

    let anEssayTextView = UITextView(frame: CGRectMake(aScrollViewWidth * CGFloat(anIndex), 0, aScrollViewWidth, aScrollViewHeight))
    anEssayTextView.text = essays[anIndex]
    anEssayTextView.editable = false
    self.scrollView.addSubview(anEssayTextView)

}

ScrollView 委托函数

ScrollView delegate function

 func scrollViewDidEndDecelerating(scrollView: UIScrollView) {

pageNumber = round(scrollView.contentOffset.x / scrollView.frame.size.width)

if (pageNumber == 0) {
    firstButtonTapped()
} else {
    secondButtonTapped()
}
}

按钮操作

Button actions

func firstButtonTapped() {

firstButton.setTitleColor(UIColor(red: 0/255, green: 191/255, blue: 165/255, alpha: 1.0), forState: .Normal)
secondButton.setTitleColor(UIColor.whiteColor(), forState: .Normal)

if (self.lineView.frame.origin.x != 0) {

    UIView.animateWithDuration(0.25) {

        self.lineView.frame.origin.x -= self.tabView.frame.size.width / 2

    }

}

scrollView.setContentOffset(CGPointMake(0, 0), animated: true)

pageNumber = 0

}


func secondButtonTapped() {

firstButton.setTitleColor(UIColor.whiteColor(), forState: .Normal)
secondButton.setTitleColor(UIColor(red: 0/255, green: 191/255, blue: 165/255, alpha: 1.0), forState: .Normal)

if (self.lineView.frame.origin.x != self.tabView.frame.size.width / 2) {

    UIView.animateWithDuration(0.25) {

        self.lineView.frame.origin.x += self.tabView.frame.size.width / 2

    }

}

scrollView.setContentOffset(CGPointMake(self.scrollView.frame.size.width, 0), animated: true)

pageNumber = 1

}

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