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我有以下代碼，我在UIImageView上硬編碼UImage。然而，我被要求修改，以便應用程序允許用戶選擇UIImageView上的哪個位置，UIImage需要放置在哪裏。我想用戶點擊屏幕，應用程序存儲我放置UIImage的x，y座標。我只是不知道該怎麼做。如何修改我的代碼以允許用戶在UIImageView上定位UIImage？
CGPDFDocumentRef document = CGPDFDocumentCreateWithURL((CFURLRef)pdfUrl);
//lets now convert the fax to an image
CGPDFPageRef page = CGPDFDocumentGetPage(document, 1);
UIImage *pageImage = [PDFPageConverter convertPDFPageToImage:page withResolution:144];
UIImage *shieldLogo = [UIImage imageNamed:@"shield_bw.gif"];
UIGraphicsBeginImageContext(pageImage.size);
[pageImage drawInRect:CGRectMake(0, 0, pageImage.size.width, pageImage.size.height)];
[shieldLogo drawInRect:CGRectMake(150, 100, shieldLogo.size.width, shieldLogo.size.height)];
[theSignature drawAtPoint:CGPointMake(200, 100) withFont:[UIFont fontWithName:@"Arial" size:15.0]];
[theSignature2 drawAtPoint:CGPointMake(200, 120) withFont:[UIFont fontWithName:@"Arial" size:15.0]];
UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[image setImage:resultingImage];