iOS 压缩图片的方法

 

+(UIImage*)thumbnaiWithImage:(UIImage*)imagesize:(CGSize)size {

   UIImage *newImage = nil;

   if(image!= nil){

      UIGraphicsBeginImageContext(size);

      [image drawInRect:CGRectMake(0,0,size.width,size.height)];

       newImage= UIGraphicsGetImageFromCurrentImageContext();

      UIGraphicsEndImageContext();

   }

   returnnewImage;

}