我该怎么做才能将我的程序生成的图片(可能来自相机,也可能不是)保存到iPhone系统照片库中?
我该怎么做才能将我的程序生成的图片(可能来自相机,也可能不是)保存到iPhone系统照片库中?
您可以使用此函数:
UIImageWriteToSavedPhotosAlbum(UIImage *image,
id completionTarget,
SEL completionSelector,
void *contextInfo);
如果您想在UIImage
保存完成时得到通知,那么只需要使用completionTarget、completionSelector和contextInfo,否则可以传入nil
。
iOS 9.0 中已弃用。
在 iOS 4.0+ 的 AssetsLibrary 框架中,有一种比 UIImageWriteToSavedPhotosAlbum 更快的方法来实现它。
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library writeImageToSavedPhotosAlbum:[image CGImage] orientation:(ALAssetOrientation)[image imageOrientation] completionBlock:^(NSURL *assetURL, NSError *error){
if (error) {
// TODO: error handling
} else {
// TODO: success handling
}
}];
[library release];
ALAssetsLibrary
进行保存,但它花费的时间与使用UIImageWriteToSavedPhotosAlbum
保存的时间一样长。 - Hlung需要记住的一件事:如果您使用回调函数,请确保您的选择器符合以下形式:
- (void) image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo;
[NSInvocation setArgument:atIndex:]: index (2) out of bounds [-1, 1]
。只需像这样从数组中传递图像即可:
-(void) saveMePlease {
//Loop through the array here
for (int i=0:i<[arrayOfPhotos count]:i++){
NSString *file = [arrayOfPhotos objectAtIndex:i];
NSString *path = [get the path of the image like you would in DOCS FOLDER or whatever];
NSString *imagePath = [path stringByAppendingString:file];
UIImage *image = [[[UIImage alloc] initWithContentsOfFile:imagePath]autorelease];
//Now it will do this for each photo in the array
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
}
}
抱歉有些错别字,我是匆忙完成的,但你应该能理解我的意思。
-(void)savePhotoToAlbum:(UIImage*)imageToSave {
CGImageRef imageRef = imageToSave.CGImage;
NSDictionary *metadata = [NSDictionary new]; // you can add
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library writeImageToSavedPhotosAlbum:imageRef metadata:metadata completionBlock:^(NSURL *assetURL,NSError *error){
if(error) {
NSLog(@"Image save eror");
}
}];
}
// Save it to the camera roll / saved photo album
// UIImageWriteToSavedPhotosAlbum(self.myUIImageView.image, nil, nil, nil) or
UIImageWriteToSavedPhotosAlbum(self.myUIImageView.image, self, "image:didFinishSavingWithError:contextInfo:", nil)
func image(image: UIImage!, didFinishSavingWithError error: NSError!, contextInfo: AnyObject!) {
if (error != nil) {
// Something wrong happened.
} else {
// Everything is alright.
}
}
保存一组照片时,不要使用for循环,可以采用以下方法:
-(void)saveToAlbum{
[self performSelectorInBackground:@selector(startSavingToAlbum) withObject:nil];
}
-(void)startSavingToAlbum{
currentSavingIndex = 0;
UIImage* img = arrayOfPhoto[currentSavingIndex];//get your image
UIImageWriteToSavedPhotosAlbum(img, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
}
- (void)image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo{ //can also handle error message as well
currentSavingIndex ++;
if (currentSavingIndex >= arrayOfPhoto.count) {
return; //notify the user it's done.
}
else
{
UIImage* img = arrayOfPhoto[currentSavingIndex];
UIImageWriteToSavedPhotosAlbum(img, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
}
}
Swift 4
func writeImage(image: UIImage) {
UIImageWriteToSavedPhotosAlbum(image, self, #selector(self.finishWriteImage), nil)
}
@objc private func finishWriteImage(_ image: UIImage, didFinishSavingWithError error: NSError?, contextInfo: UnsafeRawPointer) {
if (error != nil) {
// Something wrong happened.
print("error occurred: \(String(describing: error))")
} else {
// Everything is alright.
print("saved success!")
}
}
homeDirectoryPath = NSHomeDirectory();
unexpandedPath = [homeDirectoryPath stringByAppendingString:@"/Pictures/"];
folderPath = [NSString pathWithComponents:[NSArray arrayWithObjects:[NSString stringWithString:[unexpandedPath stringByExpandingTildeInPath]], nil]];
unexpandedImagePath = [folderPath stringByAppendingString:@"/image.png"];
imagePath = [NSString pathWithComponents:[NSArray arrayWithObjects:[NSString stringWithString:[unexpandedImagePath stringByExpandingTildeInPath]], nil]];
if (![[NSFileManager defaultManager] fileExistsAtPath:folderPath isDirectory:NULL]) {
[[NSFileManager defaultManager] createDirectoryAtPath:folderPath attributes:nil];
}