iOS Development-image compression/decompression into zip file

Compress/Unzip the image into a zip file

This article describes how to compress a picture into a zip file, first you need to download the third-party library ziparchive and import the project.

Ziparchive Library Address: https://github.com/mattconnolly/ZipArchive

First, the document structure:
Ii. Preparatory work:

1. Frame Import:

2. ziparchive.m file using non-arc mechanism

Three, code example:

viewcontroller.m//  unzipimgdemo////  Created bylotheve on 15/4/10.//  Copyright (c) 2015 Lotheve. All rights reserved.//#import "ViewController.h" #import "ZipArchive.h" @interface Viewcontroller () @property (weak, non Atomic) Iboutlet Uiimageview *imgview; @property (Weak, nonatomic) Iboutlet UIButton *zipbtn; @property (weak, nonatomic) Iboutlet UIButton *unzipbtn; @property ( Weak, nonatomic) Iboutlet UIButton *zipfiledebtn; @property (weak, nonatomic) Iboutlet UIButton *zipedfiledebtn; @property (Weak, nonatomic) Iboutlet UILabel *statuslabel; @end @implementation Viewcontroller-(void) viewdidload {    [super viewdidload];    [Self downloadimg];}

Load picture to local-(void) downloadimg{    nsstring *urlstring = @ "Https://www.baidu.com/img/bdlogo.png";    Nsurl *url = [Nsurl urlwithstring:urlstring];    NSData *data = [NSData Datawithcontentsofurl:url];       nsmutablestring *path = [Nssearchpathfordirectoriesindomains (nscachesdirectory, Nsuserdomainmask, YES) firstObject];;    nsstring *imgpath = [path stringbyappendingpathcomponent:@ "Baidu.png"];    [Data Writetofile:imgpath atomically:yes];}

Compressed file-(ibaction) ZipFile: (ID) Sender {    NSString *docspath = [Nssearchpathfordirectoriesindomains ( NSDocumentDirectory, Nsuserdomainmask, YES) firstobject];    NSString *cachespath = [Nssearchpathfordirectoriesindomains (nscachesdirectory, Nsuserdomainmask, YES) firstObject];    NSString *imgpath = [Cachespath stringbyappendingpathcomponent:@ "Baidu.png"];    NSString *zipfilepath = [Docspath stringbyappendingpathcomponent:@ "Newzipfile.zip"];    Instantiate a compressed document and create a file    ziparchive *za = [[ziparchive alloc]init];    [Za createzipfile2:zipfilepath];    Add a file in a compressed document    [za addfiletozip:imgpath newname:@ "baidu_zipped.png"];    Close zip file operation    BOOL success = [Za CloseZipFile2];    if (success) {        _statuslabel.text = @ "compression succeeded";    } else{        _statuslabel.text = @ "compression failed";    }}

//Extract File-(ibaction) Unzipfile: (ID) Sender {nsstring *docspath = [    Nssearchpathfordirectoriesindomains (NSDocumentDirectory, Nsuserdomainmask, YES) firstobject];    NSString *zippath = [Docspath stringbyappendingpathcomponent:@ "Newzipfile.zip"];    Ziparchive *za = [[Ziparchive alloc]init]; Unzip the file in memory if ([za unzipopenfile:zippath]) {//writes the extracted content to the disk BOOL success = [Za unzipfileto:docspath overwr        Ite:yes];        if (!success) {_statuslabel.text = @ "Decompression failed";            }else{//close compressed files [za unzipclosefile];            _statuslabel.text = @ "unzip successfully";            NSString *imgpath = [Docspath stringbyappendingpathcomponent:@ "Baidu_zipped.png"];            NSData *data = [NSData Datawithcontentsoffile:imgpath];            UIImage *image = [UIImage imagewithdata:data];        _imgview.image = image;    }}else{_statuslabel.text = @ "The compressed file does not exist"; }}

Delete compressed file-(ibaction) Deletezipfile: (ID) Sender {    NSString *docspath = [Nssearchpathfordirectoriesindomains ( NSDocumentDirectory, Nsuserdomainmask, YES) firstobject];    NSString *zippath = [Docspath stringbyappendingpathcomponent:@ "Newzipfile.zip"];    Create File Manager    Nsfilemanager *fm = [Nsfilemanager Defaultmanager];    Determines if the specified path file exists    BOOL exist = [FM Fileexistsatpath:zippath];    if (exist) {        Nserror *error = nil;        [FM Removeitematpath:zippath error:&error];        if (!error) {            _statuslabel.text = @ "Delete compressed file succeeded";        } else{            _statuslabel.text = @ "Delete compressed file failed";        }    } else{        _statuslabel.text = @ "file does not exist";    }}

Delete extract file-(ibaction) Deletezipedfile: (ID) Sender {    NSString *docspath = [Nssearchpathfordirectoriesindomains ( NSDocumentDirectory, Nsuserdomainmask, YES) firstobject];    NSString *zippedfilepath = [docspathstringbyappendingpathcomponent:@ "Baidu_zipped.png"];       Nsfilemanager *FM = [Nsfilemanager Defaultmanager];    BOOL exist = [FM Fileexistsatpath:zippedfilepath];    if (exist) {        Nserror *error = nil;        [FM Removeitematpath:zippedfilepath error:&error];        if (!error) {            _statuslabel.text = @ "Delete unzipped file succeeded";            _imgview.image = nil;        } else{            _statuslabel.text = @ "Delete unzip file failed";        }    } else{        _statuslabel.text = @ "file does not exist";    }}

@end

Four: Effect demonstration

Click the Compress button:

Click the Unzip button:

Delete button:

Attached: File please view in sandbox

iOS Development-image compression/decompression into zip file