图片压缩后长度和宽度 及像素坐标 
创新互联建站成立与2013年，先为红寺堡等服务建站，红寺堡等地企业，进行企业商务咨询服务。为红寺堡企业网站制作PC+手机+微官网三网同步一站式服务解决您的所有建站问题。CGFloat scaleFloat = 0.6;
+ (UIImage *) scaleImage: (UIImage *)p_w_picpath scaleFactor:(float)scaleFloat
{
CGSize size = CGSizeMake(p_w_picpath.size.width * scaleBy, p_w_picpath.size.height * scaleBy);
UIGraphicsBeginImageContext(size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGAffineTransform transform = CGAffineTransformIdentity;
transform = CGAffineTransformScale(transform, scaleBy, scaleBy);
CGContextConcatCTM(context, transform);
// Draw the p_w_picpath into the transformed context and return the p_w_picpath
[p_w_picpath drawAtPoint:CGPointMake(0.0f, 0.0f)];
UIImage *newimg = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newimg;
}
然后imgData = UIImageJPEGRepresentation(p_w_picpath, 0.6f)
imgData UIImageJPEGRepresentation(p_w_picpath, scaleFloat) |
