获取相册图片的大小

从 iphone 的 照片库中选取的图片，由于系统不能返回其文件的具体路径，所以要用到 ALAssetsLibrary 这个框架

首先导入框架 ALAssetsLibrary

导入头文件

#pragma mark UIImagePickerController 的代理方法 进行自定义控制器的操作-----

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary*)info{

__weak typeof(self) weakself = self;

[picker dismissViewControllerAnimated:YES completion:^{

UIImage *imageOriginal = [info objectForKey:UIImagePickerControllerOriginalImage];

ALAssetsLibrary* alLibrary = [[ALAssetsLibrary alloc] init];

[alLibrary assetForURL:[info objectForKey:UIImagePickerControllerReferenceURL] resultBlock:^(ALAsset *asset) {

ALAssetRepresentation *representation = [asset defaultRepresentation];

NSString *fileSize = [NSString stringWithFormat:@"(%@)",[weakself getFileSizeByBt:[NSNumber numberWithLongLong:representation.size]]];

NSLog(@"#################%@##################",fileSize);

} failureBlock:^(NSError *error) {

}];.h

//计算图片大小

- (NSString *)getFileSizeByBt:(NSNumber *)fileSize{

CGFloat size = [fileSize floatValue];

if (size >= 1024*1024*1024) {

return [NSString stringWithFormat:@"%.2fG",size/(1024*1024*1024)];

}else if (size >= 1024*1024) {

return [NSString stringWithFormat:@"%.2fM",size/(1024*1024)];

}else{

return [NSString stringWithFormat:@"%.2fK",size/1024];

}

}