<AssetsLibrary/AssetsLibrary.h>
从Safari上保存了一张动态GIF到本地的相册中
可以确定，保存到本地相册的动态GIF没有问题，只是iPhone的相册不能显示动态GIF
然后在自己的应用中，要可以选择GIF图片上传到服务器
用UIImagePickerController得到的信息是如下的格式
UIImagePickerControllerCropRect = "NSRect: {{0, 0}, {640, 480}}";
UIImagePickerControllerEditedImage = "<UIImage: 0x1e0f0080>";
UIImagePickerControllerMediaType = "public.image";
UIImagePickerControllerOriginalImage = "<UIImage: 0x1e0ea110>";
UIImagePickerControllerReferenceURL = "assets-library://asset/asset.GIF?id=B6703C91-CD81-4940-A5B0-D3B649FDD015&ext=GIF";
UIImagePickerControllerReferenceURL这个属性的路径没用办法使用，用这个路径得到的NSData是nil
UIImagePickerControllerOriginalImage这个属性虽然能得到UIImage
但是UIImage转NSData的方法，只有UIImagePNGRepresentation和UIImageJPEGRepresentation
这两个方法得到的图片数据都不是原图片的真正数据
有没有什么办法能将UIImagePickerController得到的图片转换成原始NSData的方法呢？
NSURL *imageRefURL = [info valueForKey:UIImagePickerControllerReferenceURL];
ALAssetsLibrary* assetLibrary = [[ALAssetsLibrary alloc] init];
void (^ALAssetsLibraryAssetForURLResultBlock)(ALAsset *) = ^(ALAsset *asset) {
if (asset != nil) {
[[NSFileManager defaultManager] removeItemAtPath:[PaiKeUnity getPrevImgPath] error:nil];
ALAssetRepresentation *rep = [asset defaultRepresentation];
Byte *imageBuffer = (Byte*)malloc(rep.size);
NSUInteger bufferSize = [rep getBytes:imageBuffer fromOffset:0.0 length:rep.size error:nil];
NSData *imageData = [NSData dataWithBytesNoCopy:imageBuffer length:bufferSize freeWhenDone:YES];
[imageData writeToFile:[PaiKeUnity getPrevImgPath] atomically:YES];
[self setPrevImage];
}
else {
}
};
[assetLibrary assetForURL:imageRefURL
resultBlock:ALAssetsLibraryAssetForURLResultBlock
failureBlock:^(NSError *error){
}];
[assetLibrary release];
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////////////////////////////////////////////////////
---------------------------------------------
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library assetForURL:[dic objectForKey:UIImagePickerControllerReferenceURL]
resultBlock:^(ALAsset *asset)
{
ALAssetRepresentation *representation = [asset defaultRepresentation];
CGImageRef imgRef = [representation fullResolutionImage];
UIImage *image = [UIImage imageWithCGImage:imgRef
scale:representation.scale
orientation:(UIImageOrientation)representation.orientation];
NSData
* <u><font color=
"\"red\""
>data</font></u> = UIImageJPEGRepresentation(image, 0.5);
}failureBlock:^(
NSError
*error){
NSLog
(@
"couldn't get asset: %@"
, error);
}
];