Do you have to explicitly call setNeedsDisplay after calling setFrame on a UIView?

Question

Do you have to explicitly call setNeedsDisplay after calling setFrame on UIView as shown in the following cases?

view1.frame = frame;
[view1 setNeedsDisplay];

[view2 setFrame:frame];

Answer 1

Short answer: No

You call setNeedsDisplay when you need method drawRect to be called, and according to UIView Class Reference.-

Changing the frame rectangle automatically redisplays the receiver without invoking the drawRect: method. If you want the drawRect: method invoked when the frame rectangle changes, set the contentMode property to UIViewContentModeRedraw.