iOS 绘制圆角图片方法

// 贝塞尔曲线方法
- (void)drawCornerPicture{
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(200, 200, 200, 200)];
    imageView.image = [UIImage imageNamed:@"1"];
    //绘制贝塞尔曲线
    UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:imageView.bounds cornerRadius:100];
    // 定制性高
    // UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:imageView.bounds byRoundingCorners:UIRectCornerAllCorners cornerRadii:imageView.bounds.size];
    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
    maskLayer.frame = imageView.bounds;
    maskLayer.path = maskPath.CGPath;
    imageView.layer.mask = maskLayer;
    [self.view addSubview:imageView];
}

// Graphics绘制方法
- (void)drawCornerPicture{
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(200, 400, 200, 200)];
    imageView.image = [UIImage imageNamed:@"1"];
    // 开启图片上下文
    // UIGraphicsBeginImageContext(imageView.bounds.size);
    // 一般使用下面的方法
    UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, NO, 0);
    // 绘制贝塞尔曲线
    UIBezierPath *bezierPath = [UIBezierPath bezierPathWithRoundedRect:imageView.bounds cornerRadius:100];
    // 按绘制的贝塞尔曲线剪切
    [bezierPath addClip];
    // 画图
    [imageView drawRect:imageView.bounds];
    // 获取上下文中的图片
    imageView.image = UIGraphicsGetImageFromCurrentImageContext();
    // 关闭图片上下文
    UIGraphicsEndImageContext();
    [self.view addSubview:imageView];
}

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