我正在閱讀有關swift中的設計模式的書籍,並且有一個程序可以在步進器的值更改或與其關聯的文本字段改變,這裏是法UITextField的值已更改和編輯已更改事件之間的區別是什麼
@IBAction func stockLevelDidChange(sender: AnyObject) {
println("Method Trigged")
if var currentCell = sender as? UIView {
while (true) {
currentCell = currentCell.superview!;
if let cell = currentCell as? ProductTableViewCell {
if let id = cell.productID? {
var newStockLevel:Int?;
if let stepper = sender as? UIStepper {
newStockLevel = Int(stepper.value);
} else if let textfield = sender as? UITextField {
if let newValue = textfield.text.toInt()? {
newStockLevel = newValue;
}
}
if let level = newStockLevel {
products[id].4 = level;
cell.stockStepper.value = Double(level);
cell.stockField.text = String(level);
}
}
break;
}
}
displayTotalStock();
}
}
但我有一些問題的時候改變這個線程的代碼,首先,當我剛剛剝離出來的,而看,它只是沒有工作。
@IBAction func stockLevelDidChange(sender: AnyObject) {
println("Method Trigged")
if var currentCell = sender as? UIView {
currentCell = currentCell.superview!;
if let cell = currentCell as? ProductTableViewCell {
if let id = cell.productID? {
var newStockLevel:Int?;
if let stepper = sender as? UIStepper {
newStockLevel = Int(stepper.value);
} else if let textfield = sender as? UITextField {
if let newValue = textfield.text.toInt()? {
newStockLevel = newValue;
}
}
if let level = newStockLevel {
products[id].4 = level;
cell.stockStepper.value = Double(level);
cell.stockField.text = String(level);
}
}
break;
}
displayTotalStock();
}
}
此外,當我將文本字段的事件從編輯更改爲值更改,它只是不工作了!
任何人都知道那裏發生了什麼,謝謝