iphone - Making border with QuartzCore is slow?

Question

When i try to do a border to a view my view become slow

[self.userView setBackgroundColor:[UIColor whiteColor]];
[self.userView.layer setMasksToBounds:YES];
[self.userView.layer setCornerRadius:15.0f];
[self.userView.layer setBorderColor:[UIColor lightGrayColor].CGColor];
[self.userView.layer setBorderWidth:1.0f];

Answer 1

您可能希望将shouldRasterize图层的属性设置为YES.

Answer 2

这是 omz 的回答，以提高光栅化层的质量，以防止像素化，您也需要设置光栅化比例。

[self.userView.layer setShouldRaterize:YES];
[self.userView.layer setRasterizationScale:[UIScreen mainScreen].scale];