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iOS Build a Photo Browser iPhone App View Controller Transitions Implementing Full Screen Transitions

Posted by Nehemiah Reese
Nehemiah Reese
17,692 Points

How does the frame origin move down if it is += 20.0

Need help understanding

2 Answers

Richard Lu
Richard Lu
20,185 Points
Richard Lu
Richard Lu
20,185 Points

Hi Nehemiah,

The frame is positioned like this with x marking the origin (5, 5).

0  1   2  3  4  5  6  7  8  9
1
2
3
4
5               x
6
7
8
9

If we add frame.origin.y += 2, the origin will be (5, 7) which moves down.

0  1   2  3  4  5  6  7  8  9
1
2
3
4
5
6
7               x
8
9

I hope this gives you a better picture of what's actually happening. Happy coding! :)

Nehemiah Reese
Nehemiah Reese
17,692 Points
Nehemiah Reese
Nehemiah Reese
17,692 Points

Thanks!