Document Center

    Object Storage Service

    • Release Notes
      • Release notes
    • Product Introduction
      • What is OSS?
      • Benefits
      • Basic concepts
      • Scenarios
      • Functions
      • Limits
    • Security white paper
      • Security white paper
    • Pricing
      • Billing items and methods
      • Overdue payments
    • Quick Start
      • Get started with Object Storage Service
      • Sign up for OSS
      • Create a bucket
      • Upload an object
      • Download an object
      • Delete an object
      • Delete a bucket
    • Developer Guide
      • Usage instructions
      • Basic concepts
      • Endpoint
        • Regions and endpoints
        • Endpoints
        • How do ECS users use OSS intranet addresses?
      • Storage classes
        • Introduction to storage classes
        • Convert between storage classes
        • Create and use Archive buckets
      • Access OSS
        • Quick start
        • OSS-based app development
      • Compliant retention policy
      • Disaster recovery
        • Redundant storage across zones
        • Cross-region replication
      • Buckets
        • Create a bucket
        • Set the ACL for a bucket
        • Obtain the region information of a bucket
        • View the bucket list
        • Enable the pay-by-requester mode
        • Bind a custom domain
        • Configure hotlink protection
        • Transfer acceleration
        • Set CORS rules
        • Bucket tagging
        • Delete a bucket
      • Objects
        • Upload files
          • Simple upload
          • Form upload
          • Multipart upload and resumable upload
          • Append upload
          • Authorized third-party upload
          • Upload callback
          • RTMP-based stream ingest
        • Download files
          • Simple download
          • Resumable download
          • Authorized third-party download
          • OSS Select
        • Manage files
          • Manage Object Meta
          • View the object list
          • Copy objects
          • Delete objects
          • Manage back-to-origin configurations
          • Use the SelectObject API
          • Object tagging
      • Versioning
      • Single-connection bandwidth throttling
      • Object lifecycle
        • Manage lifecycle rules
        • Lifecycle rule configuration examples
        • FAQ
      • Signature
        • OSS request process
        • Add a signature to the header
        • Add a signature to a URL
      • Identity authentication
        • What is RAM and STS
        • RAM user
        • Access OSS with a temporary access token provided by STS
      • Access and control
        • Overview
        • Access control based on ACLs
        • Bucket policy
        • Access control based on RAM Policy
          • RAM policy
          • Tutorial: Use RAM Policy to control access to buckets and folders
        • Cross-account authorization
          • Overview
          • Tutorial:Authorize a RAM user under another Alibaba Cloud account by adding a bucket policy
          • Tutorial: Grant OSS bucket permission to another Alibaba Cloud account
      • Manage logs
        • Access logging
        • Real-time log query
      • Data encryption
        • Server-side encryption
        • Introduction to client-side encryption SDK
      • Static website hosting
        • Configure static website hosting
        • Tutorial: Host a static website using a custom domain name
      • OSS sandbox
      • Monitoring service
        • Monitoring service overview
        • Monitoring service user guide
        • Alert service
        • Metric item reference
        • Monitoring indicators reference
        • Service monitoring, diagnosis, and troubleshooting
      • Cloud data processing
      • Event notification
    • Tools
      • OSS tools
      • ossbrowser
        • Quick start
        • Permission management
      • ossutil
        • Overview
        • Download and installation
        • Common commands
          • appendfromfile
          • bucket-encryption
          • bucket-policy
          • bucket-tagging
          • cat
          • config
          • cors
          • cors-options
          • cp
          • create-symlink
          • du
          • getallpartsize
          • hash
          • help
          • lifecycle
          • listpart
          • logging
          • ls
          • mb
          • mkdir
          • object-tagging
          • probe
          • read-symlink
          • referer
          • restore
          • request-payment
          • rm
          • set-acl
          • set-meta
          • sign
          • stat
          • update
          • website
        • View all supported options
        • Bucket-related commands
        • Object-related commands
        • Multipart-related commands
      • ossimport
        • Architecture and configuration
        • Standalone deployment
        • Distributed deployment
        • FAQ
      • RAM Policy Editor
      • ossftp
        • Quick installation for OSS FTP
        • How to store remote attachments to your OSS instance with Discuz
        • How to store remote attachments to your OSS instance with PHPWind
        • How to store remote attachments to your OSS instance with WordPress
        • How to integrate RAM for file sharing
        • FAQ
      • ossfs
        • Quick installation
        • FAQ
      • osscmd (unavailable)
        • Overview
        • Quick start
        • Commands for operations on buckets
        • Commands for operations on objects
        • Commands for operations on parts
    • SDK Reference
      • Introduction
      • Java
        • Preface
        • Installation
        • Quick start
        • Initialization
        • Manage a bucket
        • Enable pay-by-requester mode
        • Single-connection bandwidth throttling
        • Bucket tagging
        • Object tagging
          • Configure object tagging
          • Obtain the tags added to an object
          • Delete the tags added to an object
          • Object tagging and lifecycle rules
        • Server-side encryption
        • Upload objects
          • Overview
          • Simple upload
          • Form upload
          • Append upload
          • Resumable upload
          • Multipart upload
          • Upload progress bars
          • Upload callback
        • Download objects
          • Overview
          • Streaming download
          • Download to your local file
          • Range download
          • Resumable download
          • Conditional download
          • Download progress bars
        • Manage objects
          • Overview
          • Determine whether a specified object exists
          • Manage ACL for an object
          • Manage Object Meta
          • Convert the storage class of an object
          • List objects
          • Delete objects
          • Copy objects
          • Restore an archive object
          • Manage a symbolic link
        • Data security
        • Authorized access
        • Manage lifecycle rules
        • CORS
        • Set logging
        • Static website hosting
        • Hotlink protection
        • Cross-region replication
        • Image processing
        • Exception handling
        • FAQ
      • Python
        • Preface
        • Installation
        • Quick start
        • Initialization
        • Bucket
        • Enable pay-by-requester mode
        • Single-connection bandwidth throttling
        • Bucket tagging
        • Object tagging
          • Configure object tagging
          • Obtain the tags added to an object
          • Delete the tags added to an object
          • Object tagging and lifecycle rules
        • Upload objects
          • Overview
          • Simple upload
          • Append upload
          • Resumable upload
          • Multipart upload
          • Upload progress bars
          • Upload callback
        • Download objects
          • Overview
          • Streaming download
          • Download to your local file
          • Range download
          • Resumable download
          • Download progress bars
        • Manage objects
          • Overview
          • Determine whether a specified object exists
          • Manage ACL for an object
          • Manage Object Meta
          • Convert the storage class of an object
          • List objects
          • Delete objects
          • Copy objects
          • Restore an archive object
          • Manage a symbolic link
        • Authorized access
        • Enable logging in Python SDK
        • Data encryption
          • Client-side encryption
          • Server-side encryption
        • Static website hosting
        • Manage lifecycle rules
        • CORS
        • Set logging
        • Hotlink protection
        • Image processing
        • Chinese character and time
        • Exception handling
      • Go
        • Preface
        • Installation
        • Quick start
        • Initialization
        • Bucket
        • Pay-by-requester mode
        • Single-connection bandwidth throttling
        • Bucket tagging
        • Server-side encryption
        • Object tagging
          • Configure object tagging
          • Obtain the tags added to an object
          • Delete the tags added to an object
          • Object tagging and lifecycle rules
        • Upload objects
          • Overview
          • Simple upload
          • Append upload
          • Resumable upload
          • Multipart upload
          • Progress bars
        • Download objects
          • Overview
          • Streaming download
          • Range download
          • Download to your local file
          • Resumable download
          • Conditional download
          • Download a compressed object
          • Progress bars
        • Manage objects
          • Overview
          • Determine whether a specified object exists
          • Manage ACL for an object
          • Manage Object Meta
          • List objects
          • Delete objects
          • Copy objects
          • Restore an archive object
          • Manage a symbolic link
          • Convert the storage class of an object
        • Authorized access
        • Manage lifecycle rules
        • Set logging
        • Static website hosting
        • Hotlink protection
        • CORS
        • Image processing
        • Error handling
      • C++
        • Overview
        • Installation
        • Quick start
        • Initialization
        • Buckets
        • Pay-by-requester mode
        • Single-connection bandwidth throttling
        • Object tagging
          • Configure object tagging
          • Obtain the tags added to an object
          • Delete the tags added to an object
          • Object tagging and lifecycle rules
        • Upload objects
          • Overview
          • Simple upload
          • Append upload
          • Resumable upload
          • Multipart upload
          • Interrupt an upload task
          • Use a progress bar
          • Upload callback
        • Download objects
          • Overview
          • Download to a local file
          • Download to local memory
          • Range download
          • Resumable download
          • Use a progress bar
        • Manage objects
          • Overview
          • Manage the ACL of an object
          • Manage Object Meta
          • List objects
          • Delete objects
          • Copy an object
          • Determine whether the specified object exists
          • Restore an archive object
          • Manage a symbolic link
          • Convert the storage class of an object
        • Authorized access
        • Lifecyle rules
        • CORS
        • Access logging
        • Static website hosting
        • Hotlink protection
        • IMG
      • PHP
        • Preface
        • Installation
        • Quick start
        • Initialization
        • Bucket
        • Upload objects
          • Overview
          • Simple upload
          • Append upload
          • Multipart upload
          • Upload callback
        • Download objects
          • Overview
          • Download to your local file
          • Download to your local memory
          • Range download
          • Conditional download
        • Manage objects
          • Overview
          • Determine whether a specified object exists
          • Manage ACL for an object
          • Manage Object Meta
          • List objects
          • Delete objects
          • Copy objects
          • Restore an archive object
          • Manage a symbolic link
          • Enable MD5 verification
        • Authorized access
        • Static website hosting
        • Manage lifecycle rules
        • Set logging
        • CORS
        • Hotlink protection
        • Bind a custom domain name
        • Image processing
        • Exception handling
      • C
        • Preface
        • Installation
        • Quick start
        • Initialization
        • Bucket
        • Upload objects
          • Overview
          • Simple upload
          • Append upload
          • Resumable upload
          • Multipart upload
          • Upload progress bars
          • Upload callback
        • Download objects
          • Overview
          • Download an object to a local file
          • Download to your local memory
          • Range download
          • Resumable download
          • Download progress bars
        • Manage objects
          • Overview
          • Manage ACL for an object
          • Manage Object Meta
          • List objects
          • Delete objects
          • Copy objects
          • Restore an archive object
          • Manage a symbolic link
        • Authorized access
        • Manage lifecycle rules
        • Image processing
        • CORS
        • Set logging
        • Hotlink protection
        • Static website hosting
        • Error handling
        • FAQ
      • . NET
        • Preface
        • Installation
        • Quick start
        • Initialization
        • Manage a bucket
        • Upload objects
          • Overview
          • Simple upload
          • Append upload
          • Resumable upload
          • Multipart upload
          • Upload progress bars
          • Upload callback
        • Download objects
          • Overview
          • Streaming download
          • Range download
          • Resumable download
          • Download progress bars
        • Manage objects
          • Overview
          • Determine whether a specified object exists
          • Manage ACL for an object
          • Manage Object Meta
          • List objects
          • Delete objects
          • Copy objects
          • Restore an archive object
          • Manage a symbolic link
        • Authorized access
        • Manage lifecycle rules
        • Set logging
        • CORS
        • Static website hosting
        • Hotlink protection
        • Image processing
        • Exception handling
      • Android
        • Preface
        • Installation
        • Quick start
        • Initialization
        • Manage buckets
        • Upload objects
          • Overview
          • Simple upload
          • Append upload
          • Resumable upload
          • Progress bar
          • Upload callback
        • Download objects
          • Overview
          • Streaming download
          • Range download
          • Download an object to a local file
          • Conditional download
          • Resumable download
        • Manage objects
          • Overview
          • Determine whether a specified object exists
          • Copy an object
          • List objects
          • Delete an object
          • Set the Content-Type of an object
          • Obtain the metadata of an object
        • Data security
        • Hotlink protection
        • Sign a URL
        • Authorized access
        • Image processing
        • Exception handling
      • iOS
        • Preface
        • Installation
        • Quick start
        • Initialization
        • Manage a bucket
        • Upload objects
          • Overview
          • Simple upload
          • Multipart upload
          • Append upload
          • Upload callback
          • Resumable upload
        • Download objects
          • Overview
          • Simple download
          • Streaming download
          • Range download
          • Resumable download
        • Manage objects
          • Overview
          • Determine whether the specified object exists
          • Obtain Object Meta
          • List objects
          • Copy an object
          • Delete an object
        • Data security
        • Signed URLs
        • Authorized access
        • IMG
        • Exception handling
      • Node. js
        • Installation
        • Options
        • Quick start
        • Initialization
        • Manage a bucket
        • Upload objects
          • Overview
          • Upload a local file
          • Upload from local memory
          • Streaming upload
          • Multipart upload
          • Append upload
          • Resumable upload
        • Download objects
          • Overview
          • Download to a local file
          • Download to local memory
          • Streaming download
          • HTTP-based download
        • Manage objects
          • Overview
          • Determine whether an object exists
          • Manage Object Meta
          • List all objects in a bucket
          • List the objects and subfolders of a folder
          • Copy an object
          • Delete objects
          • Restore an Archive object
        • CNAME
        • Authorized access
        • Set ACLs
        • Manage lifecycle rules
        • Set logging
        • Static website hosting
        • Hotlink protection
        • Image processing
        • Exception handling
        • FAQ
      • Browser.js
        • Installation
        • Quick start
        • Options
        • Upload objects
        • Download objects
        • Manage objects
        • CNAME
        • Authorized access
        • Set ACLs
        • Image processing
        • Browser
        • Exception handling
        • FAQ
      • Ruby
        • Installation
        • Quick start
        • Manage buckets
        • Upload objects
        • Download objects
        • Manage objects
        • CNAME
        • Use STS to access OSS
        • Set ACLs
        • Manage lifecycle rules
        • Set logging
        • Static website hosting
        • Hotlink protection
        • CORS
        • Exception handling
        • Application of Rails
      • Media-C
        • Preface
        • Installation
        • Initialization
        • Client operations
        • Server operations
        • HLS basic interfaces
        • HLS encapsulated interfaces
        • Scenarios
        • FAQ
    • Data Processing
      • Image Processing
        • Image processing
        • Image processing access rules
        • Resize images
        • Crop images
          • Incircle
          • Crop
          • Indexed cut
          • Rounded rectangle
        • Rotate images
          • Adaptive orientation
          • Rotate
        • Apply effects
          • Blur
          • Brightness
          • Contrast
          • Sharpen
        • Convert formats
          • Format conversion
          • Gradual display
          • Quality Transformation
        • Add watermarks
        • Obtain image information
          • Retrieve dominant image tones
          • Obtain information
        • Image style
        • Source image protection
        • Save processing result
        • FAQ on using old and new versions of APIs and domain names
        • Response to errors
      • Capture video frames
    • Console User Guide
      • Log on to the OSS console
        • Log on to the OSS console as a RAM user
        • Log on to OSS console
      • Manage buckets
        • Bucket overview
        • Create a bucket
        • Change bucket ACL
        • Enable pay-by-requester mode for a bucket
        • Configure server-side encryption
        • Configure a compliant retention policy
        • Manage a domain
          • Attach a custom domain name
          • Attach a CDN acceleration domain name
          • Certificate hosting
        • Configure static website hosting
        • Configure hotlink protection
        • Configure CORS rules
        • Configure transfer acceleration
        • Set lifecycle
        • Configure cross-region replication
        • Set back-to-origin rules
        • Configure bucket tagging
        • Delete a bucket
      • Upload、download and manage objects
        • Overview
        • Upload objects
        • Create a folder
        • Search for objects
        • Change object ACL
        • Modify the storage class of an object
        • Use bucket policies to authorize other users to access OSS resources
        • Download an object
        • Set an HTTP header
        • Delete an object
        • Delete a folder
        • Restore an Archive object
        • OSS Select
        • Set a symbolic link
        • Configure object tagging
      • Manage logs
        • Set logging
        • Real-time log query
        • Log analysis
      • Manage fragments
      • Configure Event Notifications
      • Check resource usage
    • Best Practices
      • Migrate data to OSS
        • Migrate data between buckets in OSS
        • Migrate data sources from a third party to OSS
        • Migrate data from Amazon S3 to Alibaba Cloud OSS
        • Use ossimport to migrate data
        • Back up an HDFS to OSS for disaster tolerance
      • Upload data to OSS through Web applications
        • Use PostObject to upload data to OSS through Web applications
          • Overview of direct transfer on Web client
          • Javascript client signature pass-through
          • Direct transfer after adding a signature on the server
          • Directly add a signature on the server, transfer the file, and set upload callback
      • Application server
        • Set up direct data transfer for mobile apps
        • Permission control
        • Set up data callback for mobile apps
      • Data processing and analysis
        • Construct a data warehouse by using OSS and MaxCompute
        • EMR+OSS: Separated storage and computing for offline computing
      • Data backup and recovery
        • Back up buckets
      • Bucket management
        • Cross-origin resource sharing (CORS)
        • Hotlink protection
        • Static website hosting
      • Data security
        • Check data transmission integrity by using 64-bit CRC
        • Protect data by performing server-side encryption
      • OSS resource monitoring and alarm service
      • OSS performance and scalability best practice
      • OssDemo for Android
        • OssDemo introduction
        • Use the setup application server
        • Upload a file
        • Image processing
      • Terraform
        • Introduction
        • Use Terraform to manage OSS
    • API Reference
      • Overview
      • API overview
      • Definitions of common HTTP headers
      • Access control
        • User signature authentication
        • Add a signature to the header
        • Add a signature to a URL
        • Bucket access control
      • Service operations
        • GetService (ListBuckets)
      • Bucket operations
        • PutBucket
        • DeleteBucket
        • PutBucketACL
        • GetBucketAcl
        • PutBucketLifecycle
        • GetBucketLifecycle
        • DeleteBucketLifecycle
        • GetBucket (ListObject)
        • PutBucketLogging
        • GetBucketLogging
        • DeleteBucketLogging
        • PutBucketWebsite
        • GetBucketWebsite
        • DeleteBucketWebsite
        • PutBucketReferer
        • GetBucketReferer
        • GetBucketLocation
        • GetBucketInfo
        • PutBucketTags
        • GetBucketTags
        • DeleteBucketTags
        • PutBucketEncryption
        • GetBucketEncryption
        • DeleteBucketEncryption
        • PutBucketRequestPayment
        • GetBucketRequestPayment
      • Object operations
        • PutObject
        • CopyObject
        • GetObject
        • AppendObject
        • DeleteObject
        • DeleteMultipleObjects
        • HeadObject
        • GetObjectMeta
        • PutObjectACL
        • GetObjectACL
        • PostObject
        • Callback
        • PutSymlink
        • GetSymlink
        • RestoreObject
        • SelectObject
        • PutObjectTagging
        • GetObjectTagging
        • DeleteObjectTagging
      • Multipart upload operations
        • Introduction
        • InitiateMultipartUpload
        • UploadPart
        • UploadPartCopy
        • CompleteMultipartUpload
        • AbortMultipartUpload
        • ListMultipartUploads
        • ListParts
      • Cross-Origin Resource Sharing
        • Introduction
        • PutBucketcors
        • GetBucketcors
        • DeleteBucketcors
        • OptionObject
      • LiveChannel-related operations
        • Overview
        • RTMP ingest URLs and signatures
        • PutLiveChannel
        • ListLiveChannel
        • DeleteLiveChannel
        • PutLiveChannelStatus
        • GetLiveChannelInfo
        • GetLiveChannelStat
        • GetLiveChannelHistory
        • PostVodPlaylist
        • GetVodPlaylist
        • FAQ
    • Errors and Troubleshooting
      • OSS error response
      • Network connection timeout handling
      • PostObject
      • OSS permission
      • Referer
      • Upload callback
      • STS common errors and troubleshooting
      • OSS CORS
      • OSS 403
    • FAQ
      • Data migration/synchronization
      • Data protection
      • Domain/network
      • Bucket management
      • Object management
      • Signature
      • API/SDK
    • General Reference
      • Guidelines for the use of documentation
        • Alibaba Cloud documentation
        • Instructions for open source documentation
          • Open-Source Documentation Code of Conduct
          • Editing Open-Source Documentation
      • Alibaba Cloud console
      • Regions and zones
      • Service limits
      • Best practice of primary account security
      • Create an AccessKey
      • ICP Filing
      • Glossary
 
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    Overview

    Edit in Github
    Last Updated: May 07, 2019 Edit in Github

    This document describes how to use the OSS iOS SDK to download objects.

    The OSS iOS SDK provides the following download methods:
    • Simple download
    • Streaming download
    • Range download
    • Resumable download
    Previous: Resumable upload Next: Simple download

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