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-(void)addRoundBorder:(UIView *)view
{
CAShapeLayer * acircle = [CAShapeLayer layer];
acircle.path = [UIBezierPath bezierPathWithRoundedRect:view.bounds cornerRadius:view.frame.size.height/2].CGPath;
acircle.fillColor = [UIColor blackColor].CGColor;
view.layer.mask = acircle;
}
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原文地址：http://www.cnblogs.com/nonato/p/4668443.html
