Some understandings of Alpha,hidden,opaque

Source: Internet
Author: User
  • If opaque is set to Yes, the view will be treated as a full view, and the entire view will be redrawn.
  • If opaque is set to No, then the system will reduce the overhead to determine the redrawn view with its contents
  • If the background color of the view is set to transparent, then opaque is best set to no, reducing overhead

Self. BackgroundColor = [uicolor clearcolor];

self. Opaque = NO;

2. Setting hidden = yes or Alpha = 0 for UIView will have the following effect

1. The current UIView and Subview will be hidden, regardless of the alpha value of the Subview. 2. The current uiview is removed from the responder chain, and the next one in the responder chain becomes the first responder alpha with the default value of 1.0.

Some understandings of Alpha,hidden,opaque

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