如何覆盖UITextField
类中的addTarget
函数,但仅适用于UIControlEvent.allEditingEvents
?
函数是这样的,但是我不确定如何仅将其应用于特定的控制事件。
override func addTarget(_ target: Any?, action: Selector, for controlEvents: UIControlEvents) {
<#code#>
}
您应该致电super.addTarget
,如果controlEvents
等于.allEditingEvents
。
override func addTarget(_ target: Any?, action: Selector, for controlEvents: UIControlEvents) {
super.addTarget(target, action: action, for: controlEvents)
if controlEvents == .allEditingEvents {
[your code]
}
}