UIPickerView的selectRow：inComponent：animated：call pickerView：didSelectRow：inComponent：？

Question

UIPickerView的selectRow:inComponent:animated:是否致电pickerView:didSelectRow:inComponent:？ 否则，我可以自己打电话吗？

由于

Answer 1

您必须手动调用它，并通过代理执行此操作。

// In this example the UIPickerView object is in a property
...
self.pickerView.datasource = self;
self.pickerView.delegate = self;

// Selects the row in the specified component
[self.pickerView selectRow:0 inComponent:0 animated:NO];

// Manually calls pickerView:didSelectRow:inComponent:
[self pickerView:self.pickerView didSelectRow:0 inComponent:0];

Answer 2

虽然可以手动调用，但它没有。

Answer 3

它也没有用swift调用委托方法，但你也可以手动完成。决定 swift 3 和 swift 4 ：

self.pickerView.datasource = self
self.pickerView.delegate = self

self.pickerView.selectRow(0, inComponent: 0, animated: false)
self.pickerView.delegate?.pickerView?(self.pickerView, didSelectRow: 0, inComponent: 0)