[英]Cannot load image to UIImageView from absolute path
我使用UIImagePickerController來拾取圖像並加載到我的UIImageView中,但是我想保存用戶的拾取並稍后加載它,我認為將絕對路徑保存為用戶默認值會很好,但是不起作用(
我如何保存路徑//一切正常
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo: (NSDictionary *)info
{
[self.backgroundImage setImage:info[UIImagePickerControllerOriginalImage]];
NSURL* localUrl = (NSURL *)[info valueForKey:UIImagePickerControllerReferenceURL];
//in localUrl I see: assets-library://asset/asset.JPG?id=B6C0A21C-07C3-493D-8B44-3BA4C9981C25&ext=JPG
NSUserDefaults *saves = [NSUserDefaults standardUserDefaults];
[saves setValue:[localUrl absoluteString] forKey:@"backimage"];
[saves synchronize];
[self dismissViewControllerAnimated:YES completion:nil];
}
我如何嘗試加載://不起作用(
NSUserDefaults *saves = [NSUserDefaults standardUserDefaults];
if(![saves objectForKey:@"backimage"]){
[self.backgroundImage setImage:[UIImage imageNamed:@"gameBackiPhone"]];
}else{
NSURL *url = [NSURL URLWithString:[saves objectForKey:@"backimage"]];
//in url I see: assets-library://asset/asset.JPG?id=B6C0A21C-07C3-493D-8B44-3BA4C9981C25&ext=JPG
UIImage *bimage = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:url]];
[self.backgroundImage setImage:bimage];
}
我一定找不到。
您不能使用資產URL直接加載圖像,需要使用ALAssetsLibrary
類來實現它。 使用以下代碼片段通過素材資源網址加載圖片。
// *** It will return Asset from URL passed, create Image from Asset and set into your `UIImageView` ***
ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset)
{
ALAssetRepresentation *rep = [myasset defaultRepresentation];
CGImageRef iref = [rep fullResolutionImage];
if (iref) {
UIImage *largeimage = [UIImage imageWithCGImage:iref];
yourImageView.image = largeImage;
}
};
// *** If any error occurs while getting image from Asset Library following block will be invoked ***
ALAssetsLibraryAccessFailureBlock failureblock = ^(NSError *myerror)
{
NSLog(@"Can't get image - %@",[myerror localizedDescription]);
};
// *** Set Asset URL to load Image (assets-library://asset/asset.JPG?id=B6C0A21C-07C3-493D-8B44-3BA4C9981C25&ext=JPG) ***
[NSURL *asseturl = [NSURL URLWithString:yourURL];
// *** Create ALAssetsLibrary Instance and load Image ***
ALAssetsLibrary* assetslibrary = [[[ALAssetsLibrary alloc] init] autorelease];
[assetslibrary assetForURL:asseturl
resultBlock:resultblock
failureBlock:failureblock];
不要忘記在項目中導入AssetsLibrary
框架。
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