UIImageView设置为圆形

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　 CGFloat headimageX = self.view.frame.size.width * 0.2;

    CGFloat headimageY = self.view.frame.size.height * 0.25;

    CGFloat headimageW = self.view.frame.size.width * 0.6;

    CGFloat headimageH = headimageW;

    UIImageView *headimageview  = [[UIImageView alloc] init];

    headimageview.frame = CGRectMake(headimageX, headimageY, headimageW, headimageH);

    //这句必须写

    headimageview.layer.masksToBounds = YES;

    headimageview.layer.cornerRadius = headimageW * 0.5;

    headimageview.image = [UIImage imageNamed:@"1"];

    [self.view addSubview:headimageview];

UIImageView设置为圆形

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原文地址：http://www.cnblogs.com/xj76149095/p/4988688.html