How can I get the bottom left coordinate, i.e. the maximum y coordinate, of a view in obj-c and Swift?
Gabriele Petronella
Supposing that you're talking about UIView, you may want to look at the CGGeometry reference.
Talking about 'left' and y coordinate doesn't make much sense, but for instance
CGRectGetMaxY(view.frame) // will return the bottommost y coordinate of the view
CGRectGetMinX(view.frame) // will return the leftmost x coordinate of the view
and so on. You get the idea.
In Swift, this is even more convenient, as you can do
view.frame.maxY // will return the bottommost y coordinate of the view
view.frame.minX // will return the leftmost x coordinate of the view
It depends on what you want the coordinate in reference to. If you want the bottom left coordinate in your view's superview you could get the left and bottom with:
view.frame.origin.x for the left coordinate
and
view.frame.origin.y + view.frame.size.height for the bottom coordinate
来源：https://stackoverflow.com/questions/17332622/how-get-bottom-y-coordinate