最近做了个功能，就是关于打开手机相册取照片，或者是通过相机照相
作为菜鸟的我，花了两天的时间才学会，在此分享给大家
基本思路：
1 打开相机：直接打开，通过代理方法取到我们拍下的照片（在进行照片压缩上传等操作...）
2 打开相册：1）、打开系统预设的相册风格（可使用代理传递选择的照片） 2）、自定义一个相册（样式、打开的是哪个相册、多选等等，这种方法需要自己设置方法传递选择照片，我用的通知）
好，上代码，具体问题在代码里面我再说
！！第一部分：打开相机相册，回调预览
//打开相机
-(void)openCamera
{
//相机是否访问受限制
if ([ALAssetsLibrary authorizationStatus] == ALAuthorizationStatusRestricted || [ALAssetsLibrary authorizationStatus] == ALAuthorizationStatusDenied) {
AccessLimitedViewController *limitedVC = [[AccessLimitedViewController alloc]init];
limitedVC.limiteType =LimiteTypeCamera;
[self.navigationController pushViewController:limitedVC animated:YES];//自己定义受限制的界面吧，在此不在添加
return;
}
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
imagePickerController.delegate = self;//设置代理，以便取照片
[self presentViewController:imagePickerController animated:YES completion:NULL];
}
else
{
[PromoteView showPromoteViewWithContent:@"设备不支持摄像功能" andRect:CGRectMake((WIDTH-200)/2, HEIGHT/2-25, 200, 50) andTime:2 andObject:self];
}
}
//打开相册 这里自定义的相册
- (void)openPhotoLibrary
{
//相册是否访问受限
if ([ALAssetsLibrary authorizationStatus] == ALAuthorizationStatusRestricted || [ALAssetsLibrary authorizationStatus] == ALAuthorizationStatusDenied) {
AccessLimitedViewController *limitedVC = [[AccessLimitedViewController alloc]init];
limitedVC.limiteType = LimiteTypePhtoLibrary;
[self.navigationController pushViewController:limitedVC animated:YES];//同上 自己定义该界面吧
return;
}
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(photoSelected:) name:@"selectOver" object:nil];
ShowPhotoViewController*photoVc=[[ShowPhotoViewController alloc]init];
photoVc.MaxImageNum=CANSelectNum;
photoVc.numberOfSelectedImage=self.selectedImageArray.count;
[self.navigationController pushViewController:photoVc animated:YES];
}
//回调，收到选择完毕的通知，缓存选择的图片
- (void)photoSelected:(NSNotification*)sender{
[[NSNotificationCenter defaultCenter]removeObserver:self name:@"selectOver" object:nil];
if ([[sender object] isKindOfClass:[NSMutableArray class]]) {
NSMutableArray *array=(NSMutableArray*)[sender object];
for (ALAsset *asset in array) {
//用于上传
ALAssetRepresentation *representation=asset.defaultRepresentation;
CGImageRef imageRef=[representation fullScreenImage];
UIImage *image=[UIImage imageWithCGImage:imageRef];
[self.selectedImageArray addObject:image];
//用于展示 两种图片的效果不一样fullScreenImage、thumbnail
UIImage *imageShow=[UIImage imageWithCGImage:asset.thumbnail];
[self.ImageArrayToShow addObject:imageShow];
if (self.ImageArrayToShow.count==CANSelectNum) {
openPhotoLibrary.hidden=YES;
}
}
}
[self showPhotoSelected];
//开始进行图片压缩、上传
[self loopForUpImage];
}
//存储相机拍摄的照片
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
[picker dismissViewControllerAnimated:YES completion:^{
UIImage * image = [info objectForKey:UIImagePickerControllerOriginalImage];
[self.selectedImageArray addObject:image];
[self.ImageArrayToShow addObject:image];
[self showPhotoSelected];
if (self.ImageArrayToShow.count==CANSelectNum) {
openPhotoLibrary.hidden=YES;
}
}];
}
//相机的取消按钮
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
[self dismissViewControllerAnimated:YES completion:NULL];
}
//展示照片
-(void)showPhotoSelected
{
[showBackView removeFromSuperview];
if (self.ImageArrayToShow.count==0) {
return;
}
showBackView=[[UIView alloc]init];
showBackView.frame=CGRectMake(0, 290, WIDTH, (self.ImageArrayToShow.count/4+1)*(WIDTH-15-20+40)/4);
showBackView.backgroundColor=[UIColor yellowColor];
[self.view addSubview:showBackView];
for (int i=0; i<self.ImageArrayToShow.count; i++) {
int y=0;
int j=i;
if (i>3)
{
j=i-4;
y=1;
}
UIImageView *imageShow=[[UIImageView alloc]init];
imageShow.frame=CGRectMake(10+j*(WIDTH-15)/4, 10+y*(WIDTH-15)/4, (WIDTH-15-20)/4, (WIDTH-15-20)/4);
imageShow.image=(UIImage *)self.ImageArrayToShow[i];
imageShow.userInteractionEnabled=YES;
[imageShow addSubview:[self createDeleteImageButtonWithTag:i]];
[showBackView addSubview: imageShow];
//添加图片预览
imageShow.userInteractionEnabled=YES;
imageShow.tag=i;
UITapGestureRecognizer *tapImageToLook=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(lookImage:)];
[imageShow addGestureRecognizer:tapImageToLook];
}
}
-(UIButton *)createDeleteImageButtonWithTag:(int)tag//删除选定的图片的按钮
{
UIButton *button=[[UIButton alloc]init];
button.frame=CGRectMake((WIDTH-15-20)/4-16, -4, 20, 20);
button.tag=tag;
[button setBackgroundImage:[UIImage imageNamed:@"deleteimage"] forState:UIControlStateNormal];
[button addTarget:self action:@selector(deleteImage:) forControlEvents:UIControlEventTouchUpInside];
return button;
}
//删除图片
-(void)deleteImage:(UIButton *)sender
{
NSInteger i=sender.tag;
[self.selectedImageArray removeObjectAtIndex:i];
[self.ImageArrayToShow removeObjectAtIndex:i];
[self showPhotoSelected];
openPhotoLibrary.hidden=NO;
}
//预览图片
-(void)lookImage:(UITapGestureRecognizer *)tap
{
self.navigationController.navigationBarHidden=YES;
//滚动预览
scroolShowAllImage =[[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)];
scroolShowAllImage.contentSize=CGSizeMake(self.selectedImageArray.count*WIDTH, HEIGHT);
scroolShowAllImage.backgroundColor=[UIColor blackColor];
scroolShowAllImage.pagingEnabled=YES;
[self.view addSubview:scroolShowAllImage];
// 起始图片
NSInteger indexPath=tap.view.tag;
scroolShowAllImage.contentOffset=CGPointMake(indexPath*WIDTH, 0);
for (int i=0; i<self.selectedImageArray.count; i++) {
//尺寸控制
UIImage *image=[[UIImage alloc]init];
image=(UIImage *)self.selectedImageArray[i];
CGFloat imageWidth=image.size.width/2;
CGFloat imageHeight=image.size.height/2;
CGFloat scale=imageWidth/imageHeight;//比例缩放
if(imageWidth>WIDTH)
{
imageWidth=WIDTH;
imageHeight=imageWidth/scale;
}
if(imageHeight>HEIGHT)
{
imageHeight=HEIGHT;
imageWidth=imageHeight*scale;
}
imageView=[[UIImageView alloc]initWithFrame:CGRectMake((WIDTH-imageWidth)/2+WIDTH*i, (HEIGHT-imageHeight)/2, imageWidth, imageHeight)];
imageView.image=image;
[scroolShowAllImage addSubview:imageView];
//关闭预览效果
imageView.userInteractionEnabled=YES;
UITapGestureRecognizer *tapImageToClose=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(closeImage)];
[imageView addGestureRecognizer:tapImageToClose];
}
}
//关闭预览
-(void)closeImage
{
[imageView removeFromSuperview];
[scroolShowAllImage removeFromSuperview];
self.navigationController.navigationBarHidden=NO;
}
上面基本就是打开相册或者相机的方法， 有几个全局变量大家自行设置。另外需要声明代理
<UIImagePickerControllerDelegate,UIActionSheetDelegate>
几个属性 ：
@property(nonatomic,strong) NSMutableArray * uploadImageUrl;//存网址
@property(nonatomic,strong)NSMutableArray * selectedImageArray;//存放已选择照片的数组
@property(nonatomic,strong)NSMutableArray * ImageArrayToShow;//存放已选择照片的数组_需要展示的
@property(nonatomic,assign)NSInteger currentUpLoadIndex;//当前上传的第几张
第二部分： 自定义的相册 （相册列表、具体相册）
//获取相册信息
-(void)getPhotoFromALAssetsLibrary
{
if(self.photoLibrary ==nil){
NSMutableArray * array =[[NSMutableArray alloc]init];
self.photoLibrary =array;
}
lib = [[ALAssetsLibrary alloc]init];
[lib enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
if(group != nil){
//这是一个数据模型（ 注释在下面）
PhotoLibraryDataModel * libraryData = [[PhotoLibraryDataModel alloc]init];
/*<p style="margin-top: 0px; margin-bottom: 0px; font-size: 14px; line-height: normal; font-family: Menlo; color: rgb(0, 132, 0);">/*!</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 14px; line-height: normal; font-family: Menlo; color: rgb(0, 132, 0);"> <span style="font-variant-ligatures: no-common-ligatures; color: #004c14">@brief</span> <span style="line-height: normal; font-family: 'PingFang SC';">相册名字</span></p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 14px; line-height: normal; font-family: Menlo; color: rgb(0, 132, 0);"> */</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 14px; line-height: normal; font-family: Menlo; color: rgb(187, 44, 162);">@property<span style="font-variant-ligatures: no-common-ligatures; color: #000000">(</span>nonatomic<span style="font-variant-ligatures: no-common-ligatures; color: #000000">,</span>strong<span style="font-variant-ligatures: no-common-ligatures; color: #000000">)</span><span style="font-variant-ligatures: no-common-ligatures; color: #703daa">NSString</span><span style="font-variant-ligatures: no-common-ligatures; color: #000000"> *albumName;</span></p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 14px; line-height: normal; font-family: Menlo; min-height: 16px;">
</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 14px; line-height: normal; font-family: Menlo; min-height: 16px;">
</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 14px; line-height: normal; font-family: Menlo; color: rgb(0, 132, 0);">/*!</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 14px; line-height: normal; font-family: Menlo; color: rgb(0, 132, 0);"> <span style="font-variant-ligatures: no-common-ligatures; color: #004c14">@brief</span> <span style="line-height: normal; font-family: 'PingFang SC';">相册内照片的数量</span></p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 14px; line-height: normal; font-family: Menlo; color: rgb(0, 132, 0);"> */</p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 14px; line-height: normal; font-family: Menlo; color: rgb(187, 44, 162);">@property<span style="font-variant-ligatures: no-common-ligatures; color: #000000">(</span>nonatomic<span style="font-variant-ligatures: no-common-ligatures; color: #000000">,</span>assign<span style="font-variant-ligatures: no-common-ligatures; color: #000000">)</span><span style="font-variant-ligatures: no-common-ligatures; color: #703daa">NSInteger</span><span style="font-variant-ligatures: no-common-ligatures; color: #000000"> number;</span></p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 14px; line-height: normal; font-family: Menlo; color: rgb(187, 44, 162);">@property<span style="font-variant-ligatures: no-common-ligatures; color: #000000">(</span>nonatomic<span style="font-variant-ligatures: no-common-ligatures; color: #000000">,</span>strong<span style="font-variant-ligatures: no-common-ligatures; color: #000000">)</span><span style="font-variant-ligatures: no-common-ligatures; color: #703daa">ALAssetsGroup</span><span style="font-variant-ligatures: no-common-ligatures; color: #000000"> * group; </span><span style="font-variant-ligatures: no-common-ligatures; color: #008400">//</span><span style="line-height: normal; font-family: 'PingFang SC'; color: rgb(0, 132, 0);">相册对象</span></p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 14px; line-height: normal; font-family: Menlo; color: rgb(187, 44, 162);">@property<span style="font-variant-ligatures: no-common-ligatures; color: #000000">(</span>nonatomic<span style="font-variant-ligatures: no-common-ligatures; color: #000000">,</span>assign<span style="font-variant-ligatures: no-common-ligatures; color: #000000">,</span>readwrite<span style="font-variant-ligatures: no-common-ligatures; color: #000000">)</span><span style="font-variant-ligatures: no-common-ligatures; color: #703daa">CGImageRef</span><span style="font-variant-ligatures: no-common-ligatures; color: #000000"> posterImage; </span><span style="font-variant-ligatures: no-common-ligatures; color: #008400">//</span><span style="line-height: normal; font-family: 'PingFang SC'; color: rgb(0, 132, 0);">相册头图</span></p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 14px; line-height: normal; font-family: Menlo; color: rgb(187, 44, 162);">@property<span style="font-variant-ligatures: no-common-ligatures; color: #000000">(</span>nonatomic<span style="font-variant-ligatures: no-common-ligatures; color: #000000">,</span>strong<span style="font-variant-ligatures: no-common-ligatures; color: #000000">)</span><span style="font-variant-ligatures: no-common-ligatures; color: #703daa">NSMutableArray</span><span style="font-variant-ligatures: no-common-ligatures; color: #000000"> * photoArray; </span><span style="font-variant-ligatures: no-common-ligatures; color: #008400">//</span><span style="line-height: normal; font-family: 'PingFang SC'; color: rgb(0, 132, 0);">存放相册组中所有</span><span style="font-variant-ligatures: no-common-ligatures; color: #008400">ALASSet</span></p>*/
NSString * groupName = [group valueForProperty:ALAssetsGroupPropertyName];
libraryData.albumName = groupName;
libraryData.posterImage = group.posterImage;
NSMutableArray * photoArray = [[NSMutableArray alloc]init];
[group enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
if(result!= nil){
NSString * assetType = [result valueForProperty:ALAssetPropertyType];
if([assetType isEqualToString:ALAssetTypePhoto]){
[photoArray addObject:result];
}else if([assetType isEqualToString:ALAssetTypeVideo]){
}else if ([assetType isEqualToString:ALAssetTypeUnknown]){
}
}
if(index+1 ==group.numberOfAssets){
libraryData.group = group;
libraryData.photoArray = photoArray;
if ([groupName isEqualToString:@"相机胶卷"]) {
[self.photoLibrary insertObject:libraryData atIndex:0];
} else {
[self.photoLibrary addObject:libraryData];
}
[self creatTableView];
}
}];
}
} failureBlock:^(NSError *error) {
}];
}
//取到照片头图，相册名称 用表格的形式显示出来，有两个参数是我自定义的cell大家忽略即可，只看头图如何取，相册名如取
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
{
static NSString* identity=@"cell";
ShowPhotoTableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:identity];
if (cell==nil) {
cell=[[ShowPhotoTableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:identity];
}
PhotoLibraryDataModel * libraryData = [[PhotoLibraryDataModel alloc]init];
libraryData=(PhotoLibraryDataModel *)[self.photoLibrary objectAtIndex:indexPath.row];
cell.posterImage.image=[UIImage imageWithCGImage:libraryData.group.posterImage];//头图
cell.albumName.text=libraryData.albumName;//相册名
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath;
{//表格的点击事件，传值跳转
PhotoLibraryDataModel * libraryData = [[PhotoLibraryDataModel alloc]init];
libraryData=(PhotoLibraryDataModel *)[self.photoLibrary objectAtIndex:indexPath.row];
PhotoDetailViewController *detail=[[PhotoDetailViewController alloc]init];
detail.MaxImageNum=self.MaxImageNum;
detail.numberOfSelectedImage=self.numberOfSelectedImage;
detail.albumDataModel=libraryData;
[self.navigationController pushViewController:detail animated:YES];
}
接下来就相册详情，可以看到具体的照片，进行选定等操作，代码不上了分享了一下链接，感兴趣自行下载