保存照片到系统相册
保存照片到系统相册这个功能很多社交类的APP都有的，今天我们简单讲解一下，如何将图片保存到系统相册（Photo Album）。
1.创建UIImageView
创建UIImageView是为了将照片展示出来，我们是要把UIImage保存到系统相册（Photo Album）:
#define SCREEN [UIScreen mainScreen].bounds.size
self.image = [UIImage imageNamed:@"iOSDevTip"];
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake((SCREEN.width - 300) / 2, 70, 300, 150)];
imageView.image = self.image;
[self.view addSubview:imageView];
2.创建UIButton
创建UIButton并绑定actionClick:事件:
UIButton *button = [[UIButton alloc] init];
button.frame = CGRectMake( 100, 300, SCREEN.width - 200, 40);
[button addTarget:self action:@selector(actionClick:) forControlEvents:UIControlEventTouchUpInside];
[button setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
[button setBackgroundColor:[UIColor orangeColor]];
[button setTitle:@"SavePhoto" forState:UIControlStateNormal];
[self.view addSubview:button];
- (void)actionClick:(UIButton *)button
{
}
3.保存照片到系统相册（Photo Album）
在actionClick:方法里调用：
UIImageWriteToSavedPhotosAlbum(self.image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
这个时候，我们想知道保存是否成功，所以需要制定回调方法
// 指定回调方法
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
{
if(!error){
NSLog(@"save success");
}else{
NSLog(@"save failed");
}
}
在这个方法里，我们就知道照片是否保存成功。
保存照片到自己创建的相簿
接下来，我们来详细讲解一下关于系统相册权限获取、保存照片、创建自己的相簿等等功能。
1.创建自己的相簿
这也是一种比较创建的作法，创建自己的相簿，然后把照片或者视频保存到自己的相簿中。相关代码如下：
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library addAssetsGroupAlbumWithName:@"test" resultBlock:^(ALAssetsGroup *group) {
//创建相簿成功
} failureBlock:^(NSError *error) {
//失败
}];
2.保存照片
这个方法也是将照片保存到系统相簿里面，不是保存到自己创建的相簿里面。代码如下：
ALAssetsLibrary *library = [[ALAssetsLibrary alloc]init];
[library writeImageToSavedPhotosAlbum:image.CGImage orientation:(ALAssetOrientation)image.imageOrientation completionBlock:^(NSURL *asSetUrl,NSError *error){
if (error) {
//失败
}else{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"存储成功"
message:nil
delegate:nil
cancelButtonTitle:@"确定"
otherButtonTitles:nil, nil];
[alert show];
}
}];
3.获取权限
在保存照片之前，如果用户关闭相册权限，这个时候是保存失败的。如果你不做任何处理，用户是不会知道自己保存失败了。所以，我们可以在保存照片之前，做出相应的提示。如何获取这个权限呢？一般有两种方法：
（1）创建相簿失败
（2）保存照片失败
在上面两个方法创建自己的相簿和保存照片的失败结果里，我们可以弹出获取照片权限失败的提示。我们拿第一个创建相簿失败来举例：
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library addAssetsGroupAlbumWithName:@"test" resultBlock:^(ALAssetsGroup *group) {
//创建相簿成功
} failureBlock:^(NSError *error) {
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"存储失败"
message:@"请打开 设置-隐私-照片 来进行设置"
delegate:nil
cancelButtonTitle:@"确定"
otherButtonTitles:nil, nil];
[alert show];
}];
在保存照片失败的结果里，我们也可以弹出相应的提示，让用户打开应用程序的相册权限。
4.保存照片到自己的相簿
下面这段代码是在大谷歌里面找到的，亲自测试过是可以用的，整理如下：
#pragma mark - 创建相册
- (void)createAlbum
{
ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];
NSMutableArray *groups=[[NSMutableArray alloc]init];
ALAssetsLibraryGroupsEnumerationResultsBlock listGroupBlock = ^(ALAssetsGroup *group, BOOL *stop)
{
if (group)
{
[groups addObject:group];
}
else
{
BOOL haveHDRGroup = NO;
for (ALAssetsGroup *gp in groups)
{
NSString *name =[gp valueForProperty:ALAssetsGroupPropertyName];
if ([name isEqualToString:@"iOSDevTip"])
{
haveHDRGroup = YES;
}
}
if (!haveHDRGroup)
{
//do add a group named "XXXX"
[assetsLibrary addAssetsGroupAlbumWithName:@"iOSDevTip"
resultBlock:^(ALAssetsGroup *group)
{
[groups addObject:group];
}
failureBlock:nil];
haveHDRGroup = YES;
}
}
};
//创建相簿
[assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAlbum usingBlock:listGroupBlock failureBlock:nil];
[self saveToAlbumWithMetadata:nil imageData:UIImagePNGRepresentation(self.image) customAlbumName:@"iOSDevTip" completionBlock:^
{
//这里可以创建添加成功的方法
}
failureBlock:^(NSError *error)
{
//处理添加失败的方法显示alert让它回到主线程执行，不然那个框框死活不肯弹出来
dispatch_async(dispatch_get_main_queue(), ^{
//添加失败一般是由用户不允许应用访问相册造成的，这边可以取出这种情况加以判断一下
if([error.localizedDescription rangeOfString:@"User denied access"].location != NSNotFound ||[error.localizedDescription rangeOfString:@"用户拒绝访问"].location!=NSNotFound){
UIAlertView *alert=[[UIAlertView alloc]initWithTitle:error.localizedDescription message:error.localizedFailureReason delegate:nil cancelButtonTitle:NSLocalizedString(@"ok", nil) otherButtonTitles: nil];
[alert show];
}
});
}];
}
- (void)saveToAlbumWithMetadata:(NSDictionary *)metadata
imageData:(NSData *)imageData
customAlbumName:(NSString *)customAlbumName
completionBlock:(void (^)(void))completionBlock
failureBlock:(void (^)(NSError *error))failureBlock
{
ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];
__weak ALAssetsLibrary *weakSelf = assetsLibrary;
void (^AddAsset)(ALAssetsLibrary *, NSURL *) = ^(ALAssetsLibrary *assetsLibrary, NSURL *assetURL) {
[assetsLibrary assetForURL:assetURL resultBlock:^(ALAsset *asset) {
[assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
if ([[group valueForProperty:ALAssetsGroupPropertyName] isEqualToString:customAlbumName]) {
[group addAsset:asset];
if (completionBlock) {
completionBlock();
}
}
} failureBlock:^(NSError *error) {
if (failureBlock) {
failureBlock(error);
}
}];
} failureBlock:^(NSError *error) {
if (failureBlock) {
failureBlock(error);
}
}];
};
[assetsLibrary writeImageDataToSavedPhotosAlbum:imageData metadata:metadata completionBlock:^(NSURL *assetURL, NSError *error) {
if (customAlbumName) {
[assetsLibrary addAssetsGroupAlbumWithName:customAlbumName resultBlock:^(ALAssetsGroup *group) {
if (group) {
[weakSelf assetForURL:assetURL resultBlock:^(ALAsset *asset) {
[group addAsset:asset];
if (completionBlock) {
completionBlock();
}
} failureBlock:^(NSError *error) {
if (failureBlock) {
failureBlock(error);
}
}];
} else {
AddAsset(weakSelf, assetURL);
}
} failureBlock:^(NSError *error) {
AddAsset(weakSelf, assetURL);
}];
} else {
if (completionBlock) {
completionBlock();
}
}
}];
}