最近找了个三方的图片选择器QBImagePickerController，集成到项目中，基本功能都满足了，那么就它了，顺便写了点其他应用相册选取图片视频的代码，下面记录下来
Snip20170215_1.png
前四个都是采用系统的实现的，多图选择使用的是三方QBImagePickerController，先从QBImagePickerController的使用说起；
导入头文件
#import
初始化QBImagePickerController
//选择多张图
- (void)loadQBImagePickerController
{
QBImagePickerController *QBImagePickerC = [[QBImagePickerController alloc]init];
QBImagePickerC.delegate = self;
QBImagePickerC.allowsMultipleSelection = YES;//是否允许多选
QBImagePickerC.maximumNumberOfSelection = 9;//最多可选数量
QBImagePickerC.mediaType = QBImagePickerMediaTypeImage;//三种类型 图片，视频，图片和视频
QBImagePickerC.numberOfColumnsInPortrait = 4;//竖屏下一行现实的照片张数
QBImagePickerC.numberOfColumnsInLandscape = 7;//横屏下一行现实的照片张数
QBImagePickerC.prompt = @"请选择照片";//界面上方现实的文字
QBImagePickerC.showsNumberOfSelectedAssets = YES;//是否显示已选数量
QBImagePickerC.assetCollectionSubtypes = @[@(PHAssetCollectionSubtypeSmartAlbumUserLibrary), //相机胶卷
@(PHAssetCollectionSubtypeAlbumMyPhotoStream), //我的照片流
@(PHAssetCollectionSubtypeSmartAlbumPanoramas), //全景图
@(PHAssetCollectionSubtypeSmartAlbumVideos), //视频
@(PHAssetCollectionSubtypeSmartAlbumBursts) //连拍模式拍摄的照片
];
[self presentViewController:QBImagePickerC animated:YES completion:nil];
}
QBImagePickerController的代理方法
- (void)qb_imagePickerController:(QBImagePickerController *)imagePickerController didFinishPickingAssets:(NSArray *)assets;
- (void)qb_imagePickerControllerDidCancel:(QBImagePickerController *)imagePickerController;
- (BOOL)qb_imagePickerController:(QBImagePickerController *)imagePickerController shouldSelectAsset:(PHAsset *)asset;
- (void)qb_imagePickerController:(QBImagePickerController *)imagePickerController didSelectAsset:(PHAsset *)asset;
- (void)qb_imagePickerController:(QBImagePickerController *)imagePickerController didDeselectAsset:(PHAsset *)asset;
前两个代理方法最为常用：
第一个是选中图片后点击done的回调；
第二个是取消的回调；
- (void)qb_imagePickerController:(QBImagePickerController *)imagePickerController didFinishPickingAssets:(NSArray *)assets
{
[self.imageArr removeAllObjects];
for (PHAsset *set in assets) {
if(set.mediaType == PHAssetMediaTypeImage){
PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
options.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
[[PHImageManager defaultManager] requestImageForAsset:set targetSize:[UIScreen mainScreen].bounds.size contentMode:PHImageContentModeAspectFit options:options resultHandler:^(UIImage *result, NSDictionary *info) {
//设置图片
[self.imageArr addObject:result];
}];
}
}
[imagePickerController dismissViewControllerAnimated:YES completion:nil];
}
在done的回调中获取图片，获取图片后去进行需要的操作，例如压缩，上传等，这里我就不过多介绍了；
接下来是用系统方法获取图片和视频的代码；
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UIAlertController *action = [UIAlertController alertControllerWithTitle:@"" message:@"请选择" preferredStyle:UIAlertControllerStyleActionSheet];
[action addAction:[UIAlertAction actionWithTitle:@"拍摄" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[self loadCameraMovie];
}]];
[action addAction:[UIAlertAction actionWithTitle:@"拍照" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[self loadCamera];
}]];
[action addAction:[UIAlertAction actionWithTitle:@"从相册选择视频" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[self loadPhotoLibraryMovie];
}]];
[action addAction:[UIAlertAction actionWithTitle:@"从相册选择照片" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[self loadPhotoLibraryPhoto];
}]];
[action addAction:[UIAlertAction actionWithTitle:@"从相册选择多张照片" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[self loadQBImagePickerController];
}]];
[action addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
}]];
[self presentViewController:action animated:YES completion:nil];
}
拍视频
//拍摄
- (void)loadCameraMovie
{
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"" message:@"对不起，您的设备不支持拍摄功能" preferredStyle:UIAlertControllerStyleAlert];
[alert addAction:[UIAlertAction actionWithTitle:@"知道了" style:UIAlertActionStyleCancel handler:nil]];
[self presentViewController:alert animated:YES completion:nil];
}else{
UIImagePickerController *pic = [[UIImagePickerController alloc]init];
pic.sourceType = UIImagePickerControllerSourceTypeCamera;
pic.allowsEditing = YES;
pic.delegate = self;
pic.mediaTypes = @[(NSString *)kUTTypeMovie];
pic.videoMaximumDuration = 10;
[self presentViewController:pic animated:YES completion:nil];
}
}
拍照片
//拍照
- (void)loadCamera
{
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"" message:@"对不起，您的设备不支持拍照功能" preferredStyle:UIAlertControllerStyleAlert];
[alert addAction:[UIAlertAction actionWithTitle:@"知道了" style:UIAlertActionStyleCancel handler:nil]];
[self presentViewController:alert animated:YES completion:nil];
}else{
UIImagePickerController *pic = [[UIImagePickerController alloc]init];
pic.sourceType = UIImagePickerControllerSourceTypeCamera;
pic.mediaTypes = @[(NSString *)kUTTypeImage];
pic.delegate = self;
pic.allowsEditing = YES;
[self presentViewController:pic animated:YES completion:nil];
}
}
从相册选视频
//从相册选视频
- (void)loadPhotoLibraryMovie
{
UIImagePickerController *pic = [[UIImagePickerController alloc]init];
pic.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
pic.mediaTypes = @[(NSString *)kUTTypeMovie];
pic.delegate = self;
pic.allowsEditing = YES;
[self presentViewController:pic animated:YES completion:nil];
}
从相册选照片
//从相册选照片
- (void)loadPhotoLibraryPhoto
{
UIImagePickerController *pic = [[UIImagePickerController alloc]init];
pic.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
pic.mediaTypes = @[(NSString *)kUTTypeImage];
pic.delegate = self;
pic.allowsEditing = YES;
[self presentViewController:pic animated:YES completion:nil];
}
系统的回调
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
if([info[@"UIImagePickerControllerMediaType"]isEqualToString:(NSString *)kUTTypeImage]){
UIImage *pickerImage = info[@"UIImagePickerControllerOriginalImage"];
self.headimage.image = pickerImage;
[picker dismissViewControllerAnimated:YES completion:nil];
}
if([info[@"UIImagePickerControllerMediaType"]isEqualToString:(NSString *)kUTTypeMovie]){
NSURL *movieUrl = info[@"UIImagePickerControllerMediaURL"];
self.headimage.image = [self getVideoPreViewImage:movieUrl];
[picker dismissViewControllerAnimated:YES completion:nil];
}
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
[picker dismissViewControllerAnimated:YES completion:nil];
}
获取视频的缩略图
- (UIImage *)getVideoPreViewImage:(NSURL *)videoPath
{
AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:videoPath options:nil];
AVAssetImageGenerator *gen = [[AVAssetImageGenerator alloc] initWithAsset:asset];
gen.appliesPreferredTrackTransform = YES;
CMTime time = CMTimeMakeWithSeconds(0.0, 10);
NSError *error = nil;
CMTime actualTime;
CGImageRef image = [gen copyCGImageAtTime:time actualTime:&actualTime error:&error];
UIImage *img = [[UIImage alloc] initWithCGImage:image];
CGImageRelease(image);
return img;
}