iOS：压缩图片详解手机开发

 UIImage*img= [self imageWithImageSimple:image scaledToSize:CGSizeMake(210.0, 210.0)];//压缩图片 

 - (UIImage*)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize 

 // Create a graphics image context 

 UIGraphicsBeginImageContext(newSize); // Tell the old image to draw in this newcontext, with the desired 

 // new size 

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

 // Get the new image from the context 

 UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext(); 

 // End the context 

 UIGraphicsEndImageContext(); 

 // Return the new image. 

 return newImage; 

 } 

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