把一个图片裁剪成圆形或者自定义的图形

来源：互联网发布：知径公司法律师团编辑：程序博客网时间：2024/05/15 11:05

- (UIImage *)circleImage
{
    // NO代表透明
    UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0);

    // 获得上下文
    CGContextRef ctx = UIGraphicsGetCurrentContext();

    // 添加一个圆
    CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
    CGContextAddEllipseInRect(ctx, rect);

    // 裁剪
    CGContextClip(ctx);

    // 将图片画上去
    [self drawInRect:rect];

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return image;

}

- (instancetype)setCustomShapeImage{
    UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0);

    CGContextRef ctx = UIGraphicsGetCurrentContext();
    CGContextMoveToPoint(ctx, 0, 0);
    CGContextAddLineToPoint(ctx, 387, 387);
    CGContextAddLineToPoint(ctx, 0, 387);
    CGContextAddLineToPoint(ctx, 0, 0);
    CGContextClip(ctx);
    [self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)];
    UIImage * image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return image;
}

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