iOS 关于UIslider 圆形按钮(把图片裁剪小, 按钮自然就变小了)

// 把图片裁剪改变滑块圆的大小-(UIImage*)originImage:(UIImage *)image scaleToSize:(CGSize)size{    UIGraphicsBeginImageContext(size);        [image drawInRect:CGRectMake(0,0, size.width, size.height)];        UIImage* myImage =UIGraphicsGetImageFromCurrentImageContext();        UIGraphicsEndImageContext();        return myImage;}

size: CGSizeMake(with, height).

with: 你期望的图片宽度

heght: 你期望的图片高度