iOS Action 扩展如何获取小图片
<p><p>在系统照片库中，打开我的 Action 扩展，因为图片太大，扩展崩溃了，如何才能得到一个更小的图片？</p>
<p>我尝试使用以下代码，但它不起作用。</p>
<pre><code>NSDictionary * dict =@{NSItemProviderPreferredImageSizeKey:};
[itemProvider loadItemForTypeIdentifier:(NSString *)kUTTypeImage options:dict completionHandler:^(UIImage *image, NSError *error) {
}];
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>在 imageView 上加载图像之前。首先调整它的大小。然后在 imageView 上加载调整大小的图像。</p>
<pre><code>UIImage *img = ;
selectedImage = ;
</code></pre>
<p>调整图像数据大小:</p>
<pre><code>-(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);
;
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
return theImage;
}
</code></pre></p>
<p style="font-size: 20px;">关于iOSAction 扩展如何获取小图片，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/45811752/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/45811752/
</a>
</p>
页:
[1]