当它的框架交叉的UIView的逆的UILabel文本颜色(Inverse UIlabel text

2019-07-22 05:29发布

站内文章 / 前端开发
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你好我试着去改变一个UILabel的文本颜色的情况下，当标签RECT交叉的UIView的，我想也许有一个属性或东西，我可以使用。 像下面的图片：

是不是有人前满足这个问题，或者我应该怎么读开始做这件事情？

提前致谢

Answer 1:

良好的谜题！ 这是我会做：

  1. 二UIViews。 让我们把一个背景和其他的进度。 进度堆叠在背景相同的顶部origin于他们共同superview 。
  2. 他们都有一个UILabel作为子视图，并且相对于他们的父母相同的起源两标签。 背景有一个黑暗backgroundColor和它的标签上有轻textColor和进度视图有乾坤的其他方式。
  3. 进度条具有比背景更窄的帧的宽度和具有clipsToBounds==YES

诀窍是，随着若干意见来源相同，而标签的起源是相同的，在顶部视图clipsToBounds，一切都会看的权利。

丢弃这些两个视图到名为ReallyCoolProgressView一个新的UIView子类，并给它一个公共方法：

-(void)setProgress:(float)progress的进展是一个数字从0.0到1.0。 该方法缩放进度宽度，并将两标签的文本@"Progress %f", progress*100



Answer 2:

内置斯威夫特一个例子任何人在寻找一个实际应用。 在这个DANH重要的指导意义 - 谢谢！ 

import UIKit

class CDSlideView: UIView {

    var leftBackView: UIView!
    var leftBackLabel: UILabel!
    var leftFrontView: UIView!
    var leftFrontLabel: UILabel!

    var rightBackView: UIView!
    var rightBackLabel: UILabel!
    var rightFrontView: UIView!
    var rightFrontLabel: UILabel!

    var foregroundView: UIView!
    var backgroundView: UIView!

    var slideGesture: UIPanGestureRecognizer!

    let lightColor: UIColor = UIColor.whiteColor()
    let darkColor: UIColor = UIColor.blueColor()
    let leftText: String = "Search"
    let rightText: String = "New"

    var viewWidth: CGFloat!
    var viewHeight: CGFloat!
    var leftOrigin: CGFloat!
    var rightOrigin: CGFloat!
    var foregroundPadding: CGFloat = 4

    override init(frame: CGRect) {
        super.init(frame: frame)

        // Init variables variables
        viewWidth = self.frame.size.width
        viewHeight = self.frame.size.height
        leftOrigin = foregroundPadding / 2
        rightOrigin = (viewWidth - foregroundPadding) / 2 + foregroundPadding / 2

        backgroundView = UIView()
        backgroundView.frame = CGRectMake(0, 0, viewWidth, viewHeight)
        backgroundView.layer.cornerRadius = backgroundView.frame.size.height / 2
        self.addSubview(backgroundView)

        leftBackView = UIView()
        leftBackView.frame = CGRectMake(0, 0, backgroundView.frame.size.width / 2, backgroundView.frame.size.height)
        self.backgroundView.addSubview(leftBackView)

        leftBackLabel = UILabel()
        leftBackLabel.frame = CGRectMake(0, 0, leftBackView.frame.size.width, leftBackView.frame.size.height)
        leftBackLabel.font = UIFont.systemFontOfSize(13, weight: UIFontWeightSemibold)
        leftBackLabel.backgroundColor = UIColor.clearColor()
        leftBackLabel.lineBreakMode = .ByClipping
        leftBackLabel.textAlignment = .Center
        self.leftBackView.addSubview(leftBackLabel)

        rightBackView = UIView()
        rightBackView.frame = CGRectMake(backgroundView.frame.size.width / 2, 0, backgroundView.frame.size.width / 2, backgroundView.frame.size.height)
        self.backgroundView.addSubview(rightBackView)

        rightBackLabel = UILabel()
        rightBackLabel.frame = CGRectMake(0, 0, rightBackView.frame.size.width, rightBackView.frame.size.height)
        rightBackLabel.font = UIFont.systemFontOfSize(13, weight: UIFontWeightSemibold)
        rightBackLabel.backgroundColor = UIColor.clearColor()
        rightBackLabel.lineBreakMode = .ByClipping
        rightBackLabel.textAlignment = .Center
        self.rightBackView.addSubview(rightBackLabel)

        foregroundView = UIView()
        foregroundView.frame = CGRectMake(foregroundPadding / 2, foregroundPadding / 2, (backgroundView.frame.size.width - foregroundPadding) / 2, backgroundView.frame.size.height - foregroundPadding)
        foregroundView.clipsToBounds = true
        foregroundView.layer.cornerRadius = (foregroundView.frame.size.height - foregroundPadding / 2) / 2
        self.addSubview(foregroundView)

        slideGesture = UIPanGestureRecognizer(target: self, action: #selector(CDSlideView.slideAction))
        self.foregroundView.addGestureRecognizer(slideGesture)

        leftFrontView = UIView()
        leftFrontView.frame = CGRectMake(0, 0, backgroundView.frame.size.width / 2, backgroundView.frame.size.height)
        self.foregroundView.addSubview(leftFrontView)

        leftFrontLabel = UILabel()
        leftFrontLabel.font = UIFont.systemFontOfSize(13, weight: UIFontWeightSemibold)
        leftFrontLabel.backgroundColor = UIColor.clearColor()
        leftFrontLabel.translatesAutoresizingMaskIntoConstraints = false
        leftFrontLabel.lineBreakMode = .ByClipping
        leftFrontLabel.textAlignment = .Center
        self.leftFrontView.addSubview(leftFrontLabel)

        let leftFrontLabelLeadingConstraint = NSLayoutConstraint(item: leftFrontLabel, attribute: .Leading, relatedBy: .Equal, toItem: self, attribute: .Leading, multiplier: 1, constant: self.backgroundView.frame.origin.x)
        self.addConstraint(leftFrontLabelLeadingConstraint)

        let leftFrontLabelTopConstraint = NSLayoutConstraint(item: leftFrontLabel, attribute: .Top, relatedBy: .Equal, toItem: self, attribute: .Top, multiplier: 1, constant: self.backgroundView.frame.origin.y)
        self.addConstraint(leftFrontLabelTopConstraint)

        let leftFrontLabelWidthConstraint = NSLayoutConstraint(item: leftFrontLabel, attribute: .Width, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1, constant: leftFrontView.frame.size.width)
        self.addConstraint(leftFrontLabelWidthConstraint)

        let leftFrontLabelHeightConstraint = NSLayoutConstraint(item: leftFrontLabel, attribute: .Height, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1, constant: leftFrontView.frame.size.height)
        self.addConstraint(leftFrontLabelHeightConstraint)

        rightFrontView = UIView()
        rightFrontView.frame = CGRectMake(backgroundView.frame.size.width / 2, 0, backgroundView.frame.size.width / 2, backgroundView.frame.size.height)
        self.foregroundView.addSubview(rightFrontView)

        rightFrontLabel = UILabel()
        rightFrontLabel.font = UIFont.systemFontOfSize(13, weight: UIFontWeightSemibold)
        rightFrontLabel.backgroundColor = UIColor.clearColor()
        rightFrontLabel.translatesAutoresizingMaskIntoConstraints = false
        rightFrontLabel.lineBreakMode = .ByClipping
        rightFrontLabel.textAlignment = .Center
        self.rightFrontView.addSubview(rightFrontLabel)

        let rightFrontLabelTrailingConstraint = NSLayoutConstraint(item: self, attribute: .Trailing, relatedBy: .Equal, toItem: rightFrontLabel, attribute: .Trailing, multiplier: 1, constant: self.backgroundView.frame.origin.x)
        self.addConstraint(rightFrontLabelTrailingConstraint)

        let rightFrontLabelTopConstraint = NSLayoutConstraint(item: rightFrontLabel, attribute: .Top, relatedBy: .Equal, toItem: self, attribute: .Top, multiplier: 1, constant: self.backgroundView.frame.origin.y)
        self.addConstraint(rightFrontLabelTopConstraint)

        let rightFrontLabelWidthConstraint = NSLayoutConstraint(item: rightFrontLabel, attribute: .Width, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1, constant: rightFrontView.frame.size.width)
        self.addConstraint(rightFrontLabelWidthConstraint)

        let rightFrontLabelHeightConstraint = NSLayoutConstraint(item: rightFrontLabel, attribute: .Height, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1, constant: rightFrontView.frame.size.height)
        self.addConstraint(rightFrontLabelHeightConstraint)

        let leftTapGesture: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(CDSlideView.leftTap(_:)))
        self.leftBackView.addGestureRecognizer(leftTapGesture)

        let rightTapGesture: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(CDSlideView.rightTap(_:)))
        self.rightBackView.addGestureRecognizer(rightTapGesture)

        self.setLabelText(leftText, rightText: rightText)
        self.setLightColor(lightColor)
        self.setDarkColor(darkColor)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    // MARK: Setup
    func setLightColor(lightColor: UIColor) {
        let lightColor = lightColor
        self.foregroundView.backgroundColor = lightColor
        self.leftBackLabel.textColor = lightColor
        self.rightBackLabel.textColor = lightColor
    }

    func setDarkColor(darkColor: UIColor) {
        let darkColor = darkColor
        self.backgroundView.backgroundColor = darkColor
        self.leftFrontLabel.textColor = darkColor
        self.rightFrontLabel.textColor = darkColor
    }

    func setLabelText(leftText: String, rightText: String) {
        self.leftFrontLabel.text = leftText
        self.leftBackLabel.text = leftText
        self.rightFrontLabel.text = rightText
        self.rightBackLabel.text = rightText
    }

    // MARK: Actions
    func slideAction(sender: UIPanGestureRecognizer) {
        if sender.state == .Began || sender.state == .Changed {
            let translation = sender.translationInView(self)

            // Calculate where the user is trying to drag
            var newCenter: CGPoint = CGPointMake(sender.view!.center.x + translation.x, sender.view!.center.y)

            // Limit bounds & update center
            newCenter.x = max(self.frame.size.width * 0.25 + foregroundPadding / 2, newCenter.x)
            newCenter.x = min(self.frame.size.width * 0.75 - foregroundPadding / 2, newCenter.x)

            // Set new center
            sender.view!.center = newCenter
            sender.setTranslation(CGPointMake(0,0), inView: self)
        } else if sender.state == .Ended {
            let senderVCX = sender.view?.center.x

            // Snap to side
            if senderVCX <= viewWidth / 2 {
                print("called left")
                sender.view?.frame.origin.x = self.leftOrigin
            } else {
                print("called right")
                sender.view?.frame.origin.x = self.rightOrigin
            }
        }
    }

    func leftTap(sender: UITapGestureRecognizer) {
        UIView.animateWithDuration(0.05) {
            self.foregroundView.frame.origin.x = self.leftOrigin
        }
    }

    func rightTap(sender: UITapGestureRecognizer) {
        UIView.animateWithDuration(0.05) {
            self.foregroundView.frame.origin.x = self.rightOrigin
        }
    }
}


Answer 3:

我建议你看看这些方法：

您可以检查您是如何串的多少通过检查的NSString的大小，使用这种方法的观点重叠： 

[yourString sizeWithFont:yourFont constrainedToSize:maximumAllowedSize];

然后你可以使用一个NSMutableAttributedString设置标签的字符串的一部分，以一种颜色与另一种颜色的后半部分。 

//Just an example usage 
//It sets the color of characters starting from 3 to the end to blue
[str addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(3, str.length)];


//Now you have to set your string as attributed text just like below
//UILabels now support attributed strings by default which is quite handy

[yourLabel setAttributedString:str];


Answer 4:

看看这个教程与文字创造阿尔法口罩 。 使用这种技术，您可以实现跨前景和背景视图达到你想要的效果都移到一个标准的进度条。



文章来源: Inverse UIlabel text color when its frame intersects an UIView
标签： iphone ios ipad core-graphics core-text
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