如何在满足条件后停止 swift 中的 activity 指标?
How to stop the activity indicator in swift after a condition is met?
我已将 UIActivityIndicatorView 声明为计算 属性 以扩展我的模型。我有一个方法 configureCell,我在其中尝试使用 activity 指示器作为 imageView 的子视图。在这里,我可以将指标定位在特定条件下,但以后无法对其进行任何更改。例如,我无法停止 activity 指示器,无法更改颜色,甚至无法隐藏它。
extension TranscationModel: UITableViewDataSource, UITableViewDelegate
{
var activityIN: UIActivityIndicatorView {
var act = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.Gray)
act.color = UIColor.redColor()
act.hidden = false
act.startAnimating()
return act
}
func configureTransactionCell(cell : TransactionCell?, indexPath: NSIndexPath) {
if transaction.tid == "Something" {
activityIN.color = UIColor.greenColor() //Even this doesn't work
activityIN.center = cell.imgTransactionBill.center
cell.imgTransactionBill.addSubview(activityIN)
let delayTime = dispatch_time(DISPATCH_TIME_NOW, Int64(10 * Double(NSEC_PER_SEC)))
dispatch_after(delayTime, dispatch_get_main_queue()) {
activityIN.stopAnimating() //Not working
activityIN.hidden = true //Not working
}
}
}
您将 activityIN
定义为计算变量。任何时候调用它,都会得到全新的实例。查看 activityIN
var 作为 UIActivityIndicatorView
的便利初始值设定项。如果您只需要 activity 十秒钟,请像这样编辑您的函数:
func configureTransactionCell(cell : TransactionCell?, indexPath: NSIndexPath) {
if transaction.tid == "Something" {
let weakActivityIndicator = activityIN
weakActivityIndicator.color = UIColor.greenColor()
weakActivityIndicator.center = cell.imgTransactionBill.center
cell.imgTransactionBill.addSubview(weakActivityIndicator)
let delayTime = dispatch_time(DISPATCH_TIME_NOW, Int64(10 * Double(NSEC_PER_SEC)))
dispatch_after(delayTime, dispatch_get_main_queue()) {
weakActivityIndicator.stopAnimating()
weakActivityIndicator.hidden = true
}
}
}
但通常您需要保留对从该初始化程序获得的实例的引用。定义 UIActivityIndicatorView
存储 属性 在你的 TransactionCell
class.
假设 TransactionCell
class 有声明
var cellActivityIndicator: UIActivityIndicatorView!
然后你可以像这样编辑你的函数
func configureTransactionCell(cell : TransactionCell?, indexPath: NSIndexPath) {
if transaction.tid == "Something" {
cell.cellActivityIndicator = activityIN
cell.cellActivityIndicator.color = UIColor.greenColor()
cell.cellActivityIndicator.center = cell.imgTransactionBill.center
cell.imgTransactionBill.addSubview(cell.cellActivityIndicator)
let delayTime = dispatch_time(DISPATCH_TIME_NOW, Int64(10 * Double(NSEC_PER_SEC)))
dispatch_after(delayTime, dispatch_get_main_queue()) {
cell.cellActivityIndicator.stopAnimating()
cell.cellActivityIndicator.hidden = true
}
}
}
我已将 UIActivityIndicatorView 声明为计算 属性 以扩展我的模型。我有一个方法 configureCell,我在其中尝试使用 activity 指示器作为 imageView 的子视图。在这里,我可以将指标定位在特定条件下,但以后无法对其进行任何更改。例如,我无法停止 activity 指示器,无法更改颜色,甚至无法隐藏它。
extension TranscationModel: UITableViewDataSource, UITableViewDelegate
{
var activityIN: UIActivityIndicatorView {
var act = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.Gray)
act.color = UIColor.redColor()
act.hidden = false
act.startAnimating()
return act
}
func configureTransactionCell(cell : TransactionCell?, indexPath: NSIndexPath) {
if transaction.tid == "Something" {
activityIN.color = UIColor.greenColor() //Even this doesn't work
activityIN.center = cell.imgTransactionBill.center
cell.imgTransactionBill.addSubview(activityIN)
let delayTime = dispatch_time(DISPATCH_TIME_NOW, Int64(10 * Double(NSEC_PER_SEC)))
dispatch_after(delayTime, dispatch_get_main_queue()) {
activityIN.stopAnimating() //Not working
activityIN.hidden = true //Not working
}
}
}
您将 activityIN
定义为计算变量。任何时候调用它,都会得到全新的实例。查看 activityIN
var 作为 UIActivityIndicatorView
的便利初始值设定项。如果您只需要 activity 十秒钟,请像这样编辑您的函数:
func configureTransactionCell(cell : TransactionCell?, indexPath: NSIndexPath) {
if transaction.tid == "Something" {
let weakActivityIndicator = activityIN
weakActivityIndicator.color = UIColor.greenColor()
weakActivityIndicator.center = cell.imgTransactionBill.center
cell.imgTransactionBill.addSubview(weakActivityIndicator)
let delayTime = dispatch_time(DISPATCH_TIME_NOW, Int64(10 * Double(NSEC_PER_SEC)))
dispatch_after(delayTime, dispatch_get_main_queue()) {
weakActivityIndicator.stopAnimating()
weakActivityIndicator.hidden = true
}
}
}
但通常您需要保留对从该初始化程序获得的实例的引用。定义 UIActivityIndicatorView
存储 属性 在你的 TransactionCell
class.
假设 TransactionCell
class 有声明
var cellActivityIndicator: UIActivityIndicatorView!
然后你可以像这样编辑你的函数
func configureTransactionCell(cell : TransactionCell?, indexPath: NSIndexPath) {
if transaction.tid == "Something" {
cell.cellActivityIndicator = activityIN
cell.cellActivityIndicator.color = UIColor.greenColor()
cell.cellActivityIndicator.center = cell.imgTransactionBill.center
cell.imgTransactionBill.addSubview(cell.cellActivityIndicator)
let delayTime = dispatch_time(DISPATCH_TIME_NOW, Int64(10 * Double(NSEC_PER_SEC)))
dispatch_after(delayTime, dispatch_get_main_queue()) {
cell.cellActivityIndicator.stopAnimating()
cell.cellActivityIndicator.hidden = true
}
}
}