// 这时 assetsFetchResults 中包含的，应该就是各个资源（PHAsset）
for ( PHAsset *phAsset in assets) {
// 获取一个资源（PHAsset）
if (phAsset.mediaType == PHAssetMediaTypeVideo) {//视频
PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
options.version = PHImageRequestOptionsVersionCurrent;
options.deliveryMode = PHVideoRequestOptionsDeliveryModeAutomatic;
PHImageManager *manager = [PHImageManager defaultManager];
[manager requestAVAssetForVideo:phAsset options:options resultHandler:^(AVAsset * _Nullable asset, AVAudioMix * _Nullable audioMix, NSDictionary * _Nullable info) {
AVURLAsset *urlAsset = (AVURLAsset *)asset;
NSURL *videoURL = urlAsset.URL;
NSURL *mp4 = [self _convert2Mp4:videoURL];
NSFileManager *fileman = [NSFileManager defaultManager];
if ([fileman fileExistsAtPath:videoURL.path]) {
NSError *error = nil;
[fileman removeItemAtURL:videoURL error:&error];
if (error) {
NSLog(@"failed to remove file, error:%@.", error);
}
}
[self sendVideoMessageWithURL:mp4];
}];
}else{//图片或者gif
PHImageRequestOptions *option = [[PHImageRequestOptions alloc] init];
option.resizeMode = PHImageRequestOptionsResizeModeExact;
option.networkAccessAllowed = YES;
option.synchronous = YES;//同步执行
[[PHImageManager defaultManager] requestImageDataForAsset:phAsset options:option resultHandler:^(NSData *data, NSString *uti, UIImageOrientation orientation, NSDictionary *dic){
if ([uti isEqualToString:@"com.compuserve.gif"]) {
if (data != nil) {
NSString *path;
NSURL *urlPath = [dic objectForKey:@"PHImageFileURLKey"];
NSString *fileName = nil;
if (urlPath) {
fileName = [[urlPath absoluteString] lastPathComponent];
path = [self convertGIFData:data fileName:fileName];
}
[self sendImageMessageWithLocalPath:path ext:@{CHAT_GIF_EXT_KEY: @(YES)}];
}
return;
}
NSData *imageDataW = nil;
if ([uti isEqualToString:@"public.heif"] || [uti isEqualToString:@"public.heic"]) {
CIImage *ciImage = [CIImage imageWithData:data];
CIContext *context = [CIContext context];
NSData *jpgData = [context JPEGRepresentationOfImage:ciImage colorSpace:ciImage.colorSpace options:@{}];
imageDataW = jpgData;
} else {
imageDataW = data;
}
// if ([imageDataW length] / (1024 * 1024) > 3.0) {
// imageDataW = [[UIImage imageWithData: imageDataW] compressAndResize]; //图片大于3M压缩操作，可不调用此方法
// }
if (imageDataW != nil) {
[self sendImageMessageWithData:imageDataW];
} else {
[self showHint:NSEaseLocalizedString(@"message.smallerImage", @"The image size is too large, please choose another one")];
}
}];
}
}
用PHAsset获取照片名称目前网上有三种方法。
第一种：
[[PHImageManager defaultManager] requestImageForAsset:asset targetSize:size contentMode:PHImageContentModeDefault options:options resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
NSURL *url = [info valueForKey:@"PHImageFileURLKey"];
NSString *str = [url absoluteString]; //url>string
NSArray *arr = [str componentsSeparatedByString:@"/"];
NSString *imgName = [arr lastObject];
}]
这种方法是通过获取图片的URL路径，然后再获取图片名称。经过多次测试，图片URL路径有时候可以获取到，有时候获取不到，所以会导致图片名称有时候获取不到，所以这种方法并不靠谱。
第二种
NSArray *resources = [PHAssetResource assetResourcesForAsset:asset];
NSString *orgFilename = ((PHAssetResource*)resources[0]).originalFilename;
经过测试，这种方法只有在iOS 9.0以上的系统才有作用，iOS8.0用这个方法获取不到，所以这种方法并不靠谱。
第三种(靠谱的方法)
NSString *filename = [asset valueForKey:@"filename"];
