iOS 圆角图片

// 开启图形上下文

UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);

// 剪裁

UIBezierPath *path=[UIBezierPath bezierPathWithArcCenter:CGPointMake(image.size.width*0.5, image.size.height*0.5) radius:image.size.width*0.5 startAngle:0 endAngle:M_PI*2 clockwise:YES];

UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, image.size.width, image.size.height)];

[path addClip];

//绘制图片

[image drawAtPoint:CGPointZero];

// 从上下文中获取剪裁好的图片

UIImage *img = UIGraphicsGetImageFromCurrentImageContext();

// 关闭图形上下文

UIGraphicsEndImageContext();