在iOS 7中使用资产URL获取图像（UIImage）

本文介绍了在iOS 7中使用资产URL获取图像（UIImage）的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我的相册中有一些图像。我已经检索了所有这些资产的网址..我想使用资产网址获取特定图像...下面代码给了我资产网址..

I have some images in my Photo Album. I have already retrieved the asset urls of all of them.. I want to get a particular image using the asset url... below code gave me asset url..

    ALAssetRepresentation *defaultRepresentation = [asset defaultRepresentation];

                      NSString *uti = [defaultRepresentation UTI];
                      NSURL *URL = [[asset valueForProperty:ALAssetPropertyURLs] valueForKey:uti];

现在使用此网址，如何获取图片（UIImage）？

Now using this url, how can I get the image(UIImage)?

推荐答案

通过此获取网址，

NSURL *url= (NSURL*) [[asset valueForProperty:ALAssetPropertyURLs] valueForKey:[[[asset valueForProperty:ALAssetPropertyURLs] allKeys] objectAtIndex:0]];

并从下面的网址获取图片。

And get image from url like below.

ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset)
{
    ALAssetRepresentation *rep = [myasset defaultRepresentation];
    @autoreleasepool {
        CGImageRef iref = [rep fullScreenImage];
        if (iref) {
            UIImage *image = [UIImage imageWithCGImage:iref];
            self.loadedImage = image;
            dispatch_async(dispatch_get_main_queue(), ^{
                //UIMethod trigger...
            });
            iref = nil;
        }
    }
};

ALAssetsLibraryAccessFailureBlock failureblock  = ^(NSError *myerror)
{
    NSLog(@"Can't get image - %@",[myerror localizedDescription]);
};

ALAssetsLibrary* assetslibrary = [[ALAssetsLibrary alloc] init];
[assetslibrary assetForURL:yourUrl
               resultBlock:resultblock
              failureBlock:failureblock];

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