我花了很多时间弄清楚这个错误。在开始滚动时 看起来不错,但时间滚动会自动增加 人类无法读取。如何保持滚动像开始一样。
var start_index = 0
var dest_index = 0 //approximately 300
var timer = Timer()
var falagisTrue : Bool?
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
dest_index = newsViewModels.count
timer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(self.keepScrolling), userInfo: nil, repeats: true)
}
@objc func keepScrolling(){
if start_index > dest_index - 2{
timer.invalidate()
}else{
if (falagisTrue ?? false || falagisTrue == nil) {
falagisTrue = false
start_index += 1
UIView.animate(withDuration: 10, delay: 0, options: [], animations: {
let Index = IndexPath(row: self.start_index, section: 0)
self.tableView.scrollToRow(at:Index, at: .top, animated: false)
}) { finished in
self.falagisTrue = true
}
}
}
}
请您帮我解决此错误,或者提供其他替代解决方案以保持自动滚动?
答案 0 :(得分:1)
我尝试了您的代码,它对我来说正常工作。但是:
您可以添加动画选项.curveLiner(动画将在整个持续时间内平均发生)。可能是您的错误:
UIView.animate(withDuration: 10, delay: 0, options: [.curveLinear], animations: {
let Index = IndexPath(row: self.start_index, section: 0)
self.tableView.scrollToRow(at:Index, at: .top, animated: false)
}) { finished in
self.falagisTrue = true
}
当视图消失时,您应该使计时器无效(不同的是,每当旧计时器工作时,视图每次都会创建其他计时器):
override func viewWillDisappear(_ animated: Bool) {
timer.invalidate()
}