我使用 AVFoundation 框架拍照并将其保存到 photoAlbum:
- (void)captureStillImage
{
AVCaptureConnection *videoConnection = nil;
for (AVCaptureConnection *connection in [[self stillImageOutput] connections]) {
for (AVCaptureInputPort *port in [connection inputPorts]) {
if ([[port mediaType] isEqual:AVMediaTypeVideo]) {
videoConnection = connection;
break;
}
}
if (videoConnection) {
break;
}
}if ([videoConnection isVideoOrientationSupported])
[videoConnection setVideoOrientation:self.orientation];
NSLog(@"about to request a capture from: %@", [self stillImageOutput]);
[[self stillImageOutput] captureStillImageAsynchronouslyFromConnection:videoConnection
completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error)
{
ALAssetsLibraryWriteImageCompletionBlock completionBlock = ^(NSURL *assetURL, NSError *error) {
if (error) {
NSLog(@"ERROR!!!");
}
};
if (imageDataSampleBuffer != NULL)
{
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
UIImage *image = [[UIImage alloc] initWithData:imageData];
[library writeImageToSavedPhotosAlbum:[image CGImage]
orientation:(ALAssetOrientation)[image imageOrientation]
completionBlock:completionBlock];
[[NSNotificationCenter defaultCenter] postNotificationName:kImageCapturedSuccessfully object:nil];
}
}];
}
我将通知发布到方法saveImageToPhotoAlbum:
- (void)saveImageToPhotoAlbum
{
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
// Enumerate just the photos and videos group by using ALAssetsGroupSavedPhotos.
[library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
// Within the group enumeration block, filter to enumerate just photos.
[group setAssetsFilter:[ALAssetsFilter allPhotos]];
// Chooses the photo at the last index
[group enumerateAssetsAtIndexes:[NSIndexSet indexSetWithIndex:[group numberOfAssets] - 1] options:0 usingBlock:^(ALAsset *alAsset, NSUInteger index, BOOL *innerStop) {
// The end of the enumeration is signaled by asset == nil.
if (alAsset) {
ALAssetRepresentation *representation = [alAsset defaultRepresentation];
UIImage *latestPhoto = [UIImage imageWithCGImage:[representation fullScreenImage]];
self.imageView.image = latestPhoto;
}
}];
} failureBlock: ^(NSError *error) {
NSLog(@"No groups");
}];
}
我使用代码获取最后一张照片并将其显示在 imageView 上，但它显示的不是最后一张而是上一张。因此，如果我制作 3 张照片，它将显示 2，而不是 3。
有什么想法吗？？？
感谢您的帮助!
最佳答案
您的代码正在做它应该做的事情。您对代码的逻辑有疑问。您在完成保存图像之前发布通知。您必须在将图像写入库的完成 block 代码中发布通知。而且，为什么不直接在 imageView 上显示捕获的图像而不是从库中读取它呢？？
关于ios - 获取相册中最后保存的照片，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/18372408/