Setting the origin of the frame in iOS

Question

I am trying to set the origin of the frame programmatically.

Method1:

button.frame.origin.y = 100;

Method 2:

CGRect frame = button.frame;
frame.origin.y = 100;

I tried method 1 but it is not working(showing an error saying Expression is not assignable). Method 2 is working. Why is this so?

Need guidance on what I am doing right.

Answer 1

The reason you can't do method #1 is because a frame's individual properties are read-only. However, the entire frame itself is writable/assignable, thus you can do method #2.

You can even do tricks like this:

CGRect newFrame = button.frame;
newFrame.origin.y += 100; // add 100 to y's current value
button.frame = newFrame;