Layoutsubviews call time

Source: Internet
Author: User

Setneedsdisplay will call the drawrect method automatically, so that you can get uigraphicsgetcurrentcontext to draw. Setneedslayout calls layoutsubviews by default to process some data in the subview.

Layoutsubviews will be called in the following cases:

1. Initialization of init does not trigger layoutsubviews
2. addsubview triggers layoutsubviews
3. Setting a view frame triggers layoutsubviews, of course, the premise is that the frame value has changed before and after the setting
4. Rolling a uiscrollview triggers layoutsubviews
5. rotating the screen triggers the layoutsubviews event on the parent uiview.
6. Changing the size of a uiview triggers the layoutsubviews event on the parent uiview.

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.