嗨我试图在标签rect与UIView相交的情况下改变UILabel的文本颜色,我想也许有一个属性或我可以使用的东西。如下图所示:
之前有人遇到过这个问题,或者我应该阅读什么才能开始做这件事?
提前致谢
答案 0 :(得分:10)
好难题!这就是我要做的事情:
origin
上的superview
相同。backgroundColor
,它的标签有浅textColor
,进度视图则反过来。clipsToBounds==YES
诀窍是,视图的起源相同,标签的起源相同,而顶视图上的clipsToBounds,一切看起来都是正确的。
将这两个视图放入一个名为ReallyCoolProgressView的新UIView子类中,并为其提供一个公共方法:
-(void)setProgress:(float)progress
进度是一个从0.0到1.0的数字。该方法缩放progressBar宽度并设置两者标签的文本@"Progress %f", progress*100
答案 1 :(得分:2)
为任何寻找实际应用的人在Swift中建立一个示例。这个danh的重要指导 - 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
}
}
}
答案 2 :(得分:1)
我建议你看看这些方法:
通过使用以下方法检查NSString的大小,您可以检查字符串与视图重叠的程度:
[yourString sizeWithFont:yourFont constrainedToSize:maximumAllowedSize];
然后你可以使用NSMutableAttributedString将标签的部分字符串设置为一种颜色,后一部分设置为另一种颜色。
//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];
答案 3 :(得分:1)
看看this tutorial for creating alpha masks with text。使用此技术,您可以实现在前景和背景视图中移动的标准进度条,以达到您想要的效果。