问题
Currently I have a UITextField in a custom cell and I want to get the Y coordinate of that UITextField on the level of the View Controller's view (UIView). Currently I am trying to do something like this:
if (thetextField.superview.superview.superview.frame.origin.y >= keyboardY) {
}
But it seems that the Y coordinate is always 0 when it is in fact not. Is there any way to achieve this?
I am doing this because I want to detect whether the UIKeyboard is blocking the UITextField on the UIView level so that I can re-arrange my cells accordingly.
Thanks!
回答1:
Check convertPoint:* methods in UIView documentation. These methods allow you to map point to or from other views coordinates.
Provided that self is a view controller, this line returns text field's origin in view controller's view coordinates:
[thetextField convertPoint:thetextField.frame.origin toView:self.view];
You can also convert rects in a similar fashion using convertRect:* methods.
回答2:
Swift 3 version:
thetextField.convert(thetextField.frame.origin, to:self.view)
It returns a CGPoint, so you can access "x" or "y" properties.
来源：https://stackoverflow.com/questions/9474160/get-uitextfield-y-coordinate-on-uiview-level