iOS开发之获取系统相册中的图片与视频(内带url转换)
@话不多说,直接上代码
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#import // 必须导入// 照片原图路径#define KOriginalPhotoImagePath [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@OriginalPhotoImages]// 视频URL路径#define KVideoUrlPath [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@VideoURL]// caches路径#define KCachesPath [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0]// MainViewController@interface MTHMainViewController ()@property (nonatomic,strong) MTHNextViewController *nextVC;@property (nonatomic,strong) NSMutableArray *groupArrays;@property (nonatomic,strong) UIImageView *litimgView;@end@implementation MTHMainViewController- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{ self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self;}- (void)viewDidLoad{ [super viewDidLoad]; // Do any additional setup after loading the view. self.navigationItem.title = @Demo; self.view.backgroundColor = [UIColor clearColor]; // 初始化 self.groupArrays = [NSMutableArray array]; // 测试BarItem self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@测试 style:UIBarButtonItemStylePlain target:self action:@selector(testRun)]; // 测试手势 UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(didClickPanGestureRecognizer:)]; [self.navigationController.view addGestureRecognizer:panRecognizer]; // 图片或者视频的缩略图显示 self.litimgView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 200, 120, 120)]; [self.view addSubview:_litimgView];}- (void)testRun{ __weak MTHMainViewController *weakSelf = self; dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ ALAssetsLibraryGroupsEnumerationResultsBlock listGroupBlock = ^(ALAssetsGroup *group, BOOL *stop) { if (group != nil) { [weakSelf.groupArrays addObject:group]; } else { [weakSelf.groupArrays enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { [obj enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) { if ([result thumbnail] != nil) { // 照片 if ([[result valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypePhoto]){ NSDate *date= [result valueForProperty:ALAssetPropertyDate]; UIImage *image = [UIImage imageWithCGImage:[result thumbnail]]; NSString *fileName = [[result defaultRepresentation] filename]; NSURL *url = [[result defaultRepresentation] url]; int64_t fileSize = [[result defaultRepresentation] size]; NSLog(@date = %@,date); NSLog(@fileName = %@,fileName); NSLog(@url = %@,url); NSLog(@fileSize = %lld,fileSize); // UI的更新记得放在主线程,要不然等子线程排队过来都不知道什么年代了,会很慢的 dispatch_async(dispatch_get_main_queue(), ^{ self.litimgView.image = image; }); } // 视频 else if ([[result valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypeVideo] ){ // 和图片方法类似 } } }]; }]; } }; ALAssetsLibraryAccessFailureBlock failureBlock = ^(NSError *error) { NSString *errorMessage = nil; switch ([error code]) { case ALAssetsLibraryAccessUserDeniedError: case ALAssetsLibraryAccessGloballyDeniedError: errorMessage = @用户拒绝访问相册,请在<隐私>中开启; break; default: errorMessage = @Reason unknown.; break; } dispatch_async(dispatch_get_main_queue(), ^{ UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@错误,无法访问! message:errorMessage delegate:self cancelButtonTitle:@确定 otherButtonTitles:nil, nil]; [alertView show]; }); }; ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init]; [assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:listGroupBlock failureBlock:failureBlock]; });}</assetslibrary> |
@但是:
按照上面方法直接取出来的路径是无法传输的,必须自己转化成NSData对象重新写入沙盒路径
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// 将原始图片的URL转化为NSData数据,写入沙盒- (void)imageWithUrl:(NSURL *)url withFileName:(NSString *)fileName{ // 进这个方法的时候也应该加判断,如果已经转化了的就不要调用这个方法了 // 如何判断已经转化了,通过是否存在文件路径 ALAssetsLibrary *assetLibrary = [[ALAssetsLibrary alloc] init]; // 创建存放原始图的文件夹--->OriginalPhotoImages NSFileManager * fileManager = [NSFileManager defaultManager]; if (![fileManager fileExistsAtPath:KOriginalPhotoImagePath]) { [fileManager createDirectoryAtPath:KOriginalPhotoImagePath withIntermediateDirectories:YES attributes:nil error:nil]; } dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ if (url) { // 主要方法 [assetLibrary assetForURL:url resultBlock:^(ALAsset *asset) { ALAssetRepresentation *rep = [asset defaultRepresentation]; Byte *buffer = (Byte*)malloc((unsigned long)rep.size); NSUInteger buffered = [rep getBytes:buffer fromOffset:0.0 length:((unsigned long)rep.size) error:nil]; NSData *data = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:YES]; NSString * imagePath = [KOriginalPhotoImagePath stringByAppendingPathComponent:fileName]; [data writeToFile:imagePath atomically:YES]; } failureBlock:nil]; } });}// 将原始视频的URL转化为NSData数据,写入沙盒- (void)videoWithUrl:(NSURL *)url withFileName:(NSString *)fileName{ // 解析一下,为什么视频不像图片一样一次性开辟本身大小的内存写入? // 想想,如果1个视频有1G多,难道直接开辟1G多的空间大小来写? ALAssetsLibrary *assetLibrary = [[ALAssetsLibrary alloc] init]; dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ if (url) { [assetLibrary assetForURL:url resultBlock:^(ALAsset *asset) { ALAssetRepresentation *rep = [asset defaultRepresentation]; NSString * videoPath = [KCachesPath stringByAppendingPathComponent:fileName]; char const *cvideoPath = [videoPath UTF8String]; FILE *file = fopen(cvideoPath, a+); if (file) { const int bufferSize = 1024 * 1024; // 初始化一个1M的buffer Byte *buffer = (Byte*)malloc(bufferSize); NSUInteger read = 0, offset = 0, written = 0; NSError* err = nil; if (rep.size != 0) { do { read = [rep getBytes:buffer fromOffset:offset length:bufferSize error:&err]; written = fwrite(buffer, sizeof(char), read, file); offset += read; } while (read != 0 && !err);//没到结尾，没出错，ok继续 } // 释放缓冲区，关闭文件 free(buffer); buffer = NULL; fclose(file); file = NULL; } } failureBlock:nil]; } }); |
