我需要做什么才能将我的程序生成的图像（可能是相机，可能不是）保存到iPhone上的系统照片库？
答案 0 :(得分：409)
您可以使用此功能：
UIImageWriteToSavedPhotosAlbum(UIImage *image,
id completionTarget,
SEL completionSelector,
void *contextInfo);
如果您希望在保存UIImage时收到通知，则只需 completionTarget ， completionSelector 和 contextInfo ，否则你可以传递nil。
请参阅official documentation for UIImageWriteToSavedPhotosAlbum()。
答案 1 :(得分：63)
在iOS 9.0中弃用。
使用iOS 4.0+ AssetsLibrary框架实现它的速度要快得多UIImageWriteToSavedPhotosAlbum
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];
答案 2 :(得分：27)
最简单的方法是：
UIImageWriteToSavedPhotosAlbum(myUIImage, nil, nil, nil);
对于Swift，您可以参考Saving to the iOS photo library using swift
答案 3 :(得分：13)
要记住的一件事：如果您使用回调，请确保您的选择符符合以下格式：
- (void) image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo;
否则，您将因以下错误而崩溃：
[NSInvocation setArgument:atIndex:]: index (2) out of bounds [-1, 1]
答案 4 :(得分：10)
只需将数组中的图像传递给它
-(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);
}
}
很抱歉打字错误就是这样，但你明白了这一点
答案 5 :(得分：4)
保存照片数组时，请勿使用for循环，请执行以下操作
-(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);
}
}
答案 6 :(得分：4)
在 Swift ：
// 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.
}
}
答案 7 :(得分：4)
以下功能可行。你可以从这里复制并粘贴在那里......
-(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");
}
}];
}
答案 8 :(得分：2)
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];
}
答案 9 :(得分：1)
我的上一个答案将会这样做..
对于要保存的每个图像，将其添加到NSMutableArray
//in the .h file put:
NSMutableArray *myPhotoArray;
///then in the .m
- (void) viewDidLoad {
myPhotoArray = [[NSMutableArray alloc]init];
}
//However Your getting images
- (void) someOtherMethod {
UIImage *someImage = [your prefered method of using this];
[myPhotoArray addObject:someImage];
}
-(void) saveMePlease {
//Loop through the array here
for (int i=0:i<[myPhotoArray count]:i++){
NSString *file = [myPhotoArray 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);
}
}
答案 10 :(得分：1)
我根据上面的一些答案为此创建了一个UIImageView类别。
标题文件：
@interface UIImageView (SaveImage) <UIActionSheetDelegate>
- (void)addHoldToSave;
@end
实施
@implementation UIImageView (SaveImage)
- (void)addHoldToSave{
UILongPressGestureRecognizer* longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];
longPress.minimumPressDuration = 1.0f;
[self addGestureRecognizer:longPress];
}
- (void)handleLongPress:(UILongPressGestureRecognizer*)sender {
if (sender.state == UIGestureRecognizerStateEnded) {
UIActionSheet* _attachmentMenuSheet = [[UIActionSheet alloc] initWithTitle:nil
delegate:self
cancelButtonTitle:@"Cancel"
destructiveButtonTitle:nil
otherButtonTitles:@"Save Image", nil];
[_attachmentMenuSheet showInView:[[UIView alloc] initWithFrame:self.frame]];
}
else if (sender.state == UIGestureRecognizerStateBegan){
//Do nothing
}
}
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
if (buttonIndex == 0) {
UIImageWriteToSavedPhotosAlbum(self.image, nil,nil, nil);
}
}
@end
现在只需在您的imageview上调用此函数：
[self.imageView addHoldToSave];
您可以选择更改minimumPressDuration参数。
答案 11 :(得分：1)
在 Swift 2.2
中UIImageWriteToSavedPhotosAlbum(image: UIImage, _ completionTarget: AnyObject?, _ completionSelector: Selector, _ contextInfo: UnsafeMutablePointer<Void>)
如果您不想在图片保存时收到通知，那么您可以在 completionTarget ， completionSelector 和 contextInfo 中传递nil参数。
示例：
UIImageWriteToSavedPhotosAlbum(image, self, #selector(self.imageSaved(_:didFinishSavingWithError:contextInfo:)), nil)
func imageSaved(image: UIImage!, didFinishSavingWithError error: NSError?, contextInfo: AnyObject?) {
if (error != nil) {
// Something wrong happened.
} else {
// Everything is alright.
}
}
这里要注意的重要一点是，观察图像保存的方法应该具有这3个参数，否则您将遇到NSInvocation错误。
希望它有所帮助。
答案 12 :(得分：0)
您可以使用此
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
UIImageWriteToSavedPhotosAlbum(img.image, nil, nil, nil);
});
答案 13 :(得分：0)
雨燕4
func writeImage(image: UIImage) {
UIImageWriteToSavedPhotosAlbum(image, self, #selector(finishWriteImage), nil)
}
@objc private func finishWriteImage(_ image: UIImage, didFinishSavingWithError error: NSError?, contextInfo: UnsafeRawPointer) {
}
答案 14 :(得分：0)
对于Swift 5.0
我使用此代码将图像复制到应用程序创建的相册中； 当我要复制图像文件时，我调用“ startSavingPhotoAlbume（）”函数。 首先，我从App文件夹中获取UIImage，然后将其保存到相册中。 因为这无关紧要，所以我不展示如何从App文件夹中读取图像。
var saveToPhotoAlbumCounter = 0
func startSavingPhotoAlbume(){
saveToPhotoAlbumCounter = 0
saveToPhotoAlbume()
}
func saveToPhotoAlbume(){
let image = loadImageFile(fileName: imagefileList[saveToPhotoAlbumCounter], folderName: folderName)
UIImageWriteToSavedPhotosAlbum(image!, self, #selector(image(_:didFinishSavingWithError:contextInfo:)), nil)
}
@objc func image(_ image: UIImage, didFinishSavingWithError error: NSError?, contextInfo: UnsafeRawPointer) {
if (error != nil) {
print("ptoto albume savin error for \(imageFileList[saveToPhotoAlbumCounter])")
} else {
if saveToPhotoAlbumCounter < imageFileList.count - 1 {
saveToPhotoAlbumCounter += 1
saveToPhotoAlbume()
} else {
print("saveToPhotoAlbume is finished with \(saveToPhotoAlbumCounter) files")
}
}
}