Created
July 9, 2020 11:34
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text animation in label forward and backward swift
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| var countries = ["'Espagne","'Italie","aFrance"] | |
| var cIndex = 0 | |
| var initStringLength : Int? = 0 | |
| override func viewDidAppear(_ animated: Bool) { | |
| titleLabel.text = "#CetEteJeVisiteL" | |
| initStringLength = titleLabel.text?.count | |
| animateText(countries[cIndex]) | |
| } | |
| fileprivate func animateText(_ country: String) { | |
| let countryLength = country.count | |
| for i in country { | |
| if i != country.last{ | |
| animateForward(i) | |
| }else{ | |
| animateForward(i) | |
| Timer.scheduledTimer(withTimeInterval: 1, repeats: false) { _ in | |
| if self.animateBack(countryLength) { | |
| if self.cIndex >= 2 { | |
| self.cIndex = 0 | |
| } else { | |
| self.cIndex += 1 | |
| } | |
| self.animateText(self.countries[self.cIndex]) | |
| } | |
| } | |
| } | |
| } | |
| } | |
| fileprivate func animateBack(_ countryLength: Int) -> Bool{ | |
| var animFinished:Bool = false | |
| for _ in 0...countryLength { | |
| self.titleLabel.text = remove_char(str1: self.titleLabel.text!) | |
| RunLoop.current.run(until: Date()+0.20) | |
| } | |
| animFinished = true | |
| return animFinished | |
| } | |
| fileprivate func animateForward(_ i: String.Element) { | |
| titleLabel.text! += "\(i)" | |
| RunLoop.current.run(until: Date()+0.20) | |
| } | |
| func remove_char(str1: String) -> String { | |
| var s = str1 | |
| if let index = s.index(s.startIndex, offsetBy: str1.count-1, limitedBy: s.endIndex) { | |
| if s.count != initStringLength { | |
| s.remove(at: index) | |
| } | |
| } else { | |
| print("is out of range") | |
| } | |
| return s | |
| } | |
Author
wassim93
commented
Jul 9, 2020
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