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[英]How to get a reference to the PHAsset from an image URL in the iOS Extension?
[英]iOS action extension how to get a small image
在系統圖片庫中,打開我的動作擴展程序,因為圖像太大,擴展程序崩潰了,我如何獲得較小的圖像?
我嘗試使用以下代碼,但無法正常工作。
NSDictionary * dict =@{NSItemProviderPreferredImageSizeKey:[NSValue valueWithCGSize:CGSizeMake(300, 300)]};
[itemProvider loadItemForTypeIdentifier:(NSString *)kUTTypeImage options:dict completionHandler:^(UIImage *image, NSError *error) {
}];
在將圖像加載到imageView上之前。 首先調整它的大小。 然后將調整大小后的圖像加載到imageView上。
UIImage *img = [UIImage imageWithData:selectedImgdata];
selectedImage = [self resizeImage:img];
調整圖像數據大小:
-(UIImage *)resizeImage :(UIImage *)theImage
{
if((theImage.size.width > 1024 && theImage.size.height > 768) || (theImage.size.width > 768 && theImage.size.height > 1024) || (theImage.size.width > 1024 && theImage.size.height < 768) || (theImage.size.height > 1024 && theImage.size.width < 768))
{
float newHeight,newWidth,oldWidth,oldHeight,scaleFactor;
if(theImage.size.width > theImage.size.height)
{
oldWidth = theImage.size.width;
scaleFactor = 1024 / oldWidth;
newHeight = theImage.size.height * scaleFactor;
newWidth = oldWidth * scaleFactor;
}
else
{
oldHeight = theImage.size.height;
scaleFactor = 1024 / oldHeight;
newWidth = theImage.size.width * scaleFactor;
newHeight = oldHeight * scaleFactor;
}
UIGraphicsBeginImageContextWithOptions(CGSizeMake(newWidth, newHeight), NO, 1.0);
[theImage drawInRect:CGRectMake(0, 0, newWidth, newHeight)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
return theImage;
}
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