UIImage 压缩

1.改变图片大小

-(UIImage*)imageWithImage:(UIImage*)image scaledToSize:(CGSize)newSize
{
    // Create a graphics image context
    UIGraphicsBeginImageContext(newSize);
    
    // Tell the old image to draw in this new context, 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;
}

2.改变图片质量

NSData *imageData = UIImageJPEGRepresentation(imageNew, 0.0001);

code

 UIImage *imageNew;

    imageNew = [info objectForKey:@"UIImagePickerControllerOriginalImage"];

    imageNew = [self imageWithImage:imageNew scaledToSize:CGSizeMake(100, 100)];

    NSData *imageData = UIImageJPEGRepresentation(imageNew, 0.0001);

    

    m_selectImage = [UIImage imageWithData:imageData];

转载于:https://www.cnblogs.com/zzzili/archive/2013/03/13/6685341.html