利用UIBezierPath实现一个带圆角的视图

- (void)drawRect:(CGRect)rect
{
// draw a box with rounded corners to fill the view -
UIBezierPath *roundedRect = [UIBezierPath bezierPathWithRoundedRect:self.bounds cornerRadius:5.0f];
[[UIColor colorWithWhite:0.8 alpha:0.5] setFill];
[roundedRect fillWithBlendMode:kCGBlendModeNormal alpha:1];
}

UIBezierPath 的使用介绍  

// 通过UINib 加载xib资源文件
UINib *hoverViewXib = [UINib nibWithNibName:@"xxxx" bundle:nil];
[hoverViewXib instantiateWithOwner:self options:nil];