我有一个 UIButton 需要在用户从相册中选择一张照片以显示其选择后更改其图像，我已启动并运行此设置，但是一旦用户选择了一张照片，我需要将其调整为按钮尺寸这就是我需要帮助的地方，这是我的代码：
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
[picker dismissModalViewControllerAnimated:YES];
UIImage *giftImage = [info objectForKey:UIImagePickerControllerOriginalImage];
[giftImage resizableImageWithCapInsets:UIEdgeInsetsMake( 0, 10, 0, 10 )];
[giftButton setBackgroundImage:giftImage forState:UIControlStateNormal];
giftButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentFill;
giftButton.imageView.contentMode = UIViewContentModeScaleToFill;
giftButton.imageView.bounds = CGRectMake( 0, 0, 62, 62 );
}
更新：找到了一个解决方案，到目前为止，发生的所有事情都是按钮被调整为图像尺寸，但是使用下面的代码，我设法将图像插入到我需要的大小，这是一项正在进行的工作，但正在工作;)
CGSize targetSize = CGSizeMake( 62, 62 );
UIGraphicsBeginImageContext( targetSize );
CGRect thumbnailRect = CGRectZero;
thumbnailRect.origin = CGPointMake( 0, 0 );
thumbnailRect.size.width = 62;
thumbnailRect.size.height = 62;
[giftImage drawInRect:thumbnailRect];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
[giftButton setBackgroundImage:newImage forState:UIControlStateNormal];
UIGraphicsEndImageContext();
代码来自这篇文章Resize and crop images before displayed in UITableViewCells