【iOS】json文件转成NSArray

在项目中，因为需求的更迭，一个列表里的数据会不断的改变，有人会选择直接在控制器里用代码写死数组，需求更迭的时候，去控制器里增删改数组元素，有人会选择用plist来处理，我之前一直用的是plist方法，比前者的可操作性更强，这篇文章介绍的方法，跟plist的逻辑是一样的，只是把plist换成了json。

不多说，直接上图上代码

applications.json：

[ { "display_name": "500px", "developer_name": "500px", "identifier": "471965292" }, { "display_name": "Airbnb", "developer_name": "Airbnb, Inc.", "identifier": "401626263" }, { "display_name": "AppStore", "developer_name": "Apple, Inc.", "identifier": "" }, { "display_name": "Camera", "developer_name": "Apple, Inc.", "identifier": "" }, { "display_name": "Dropbox", "developer_name": "Dropbox, Inc.", "identifier": "327630330" }, { "display_name": "Facebook", "developer_name": "Facebook, Inc.", "identifier": "284882215" }, { "display_name": "Fancy", "developer_name": "Thing Daemon, Inc.", "identifier": "407324335" }, { "display_name": "Foursquare", "developer_name": "Foursquare Labs", "identifier": "306934924" }, { "display_name": "iCloud", "developer_name": "Apple, Inc.", "identifier": "" }, { "display_name": "Instagram", "developer_name": "Instagram, Inc.", "identifier": "389801252" }, { "display_name": "iTunes Connect", "developer_name": "Apple, Inc.", "identifier": "376771144" }, { "display_name": "Kickstarter", "developer_name": "Kickstarter, Inc.", "identifier": "596961532" }, { "display_name": "Path", "developer_name": "Path, Inc.", "identifier": "403639508" }, { "display_name": "Pinterest", "developer_name": "Pinterest, Inc.", "identifier": "429047995" }, { "display_name": "Photos", "developer_name": "Apple, Inc.", "identifier": "" }, { "display_name": "Podcasts", "developer_name": "Apple, Inc.", "identifier": "525463029" }, { "display_name": "Remote", "developer_name": "Apple, Inc.", "identifier": "284417350" }, { "display_name": "Safari", "developer_name": "Apple, Inc.", "identifier": "" }, { "display_name": "Skype", "developer_name": "Skype Communications S.a.r.l", "identifier": "304878510" }, { "display_name": "Slack", "developer_name": "Tiny Speck, Inc.", "identifier": "618783545" }, { "display_name": "Tumblr", "developer_name": "Tumblr, Inc.", "identifier": "305343404" }, { "display_name": "Twitter", "developer_name": "Twitter, Inc.", "identifier": "333903271" }, { "display_name": "Vesper", "developer_name": "Q Branch", "identifier": "655895325" }, { "display_name": "Videos", "developer_name": "Apple, Inc.", "identifier": "" }, { "display_name": "Vine", "developer_name": "Vine Labs, Inc.", "identifier": "592447445" }, { "display_name": "WhatsApp", "developer_name": "WhatsApp, Inc.", "identifier": "310633997" }, { "display_name": "WWDC", "developer_name": "Apple, Inc.", "identifier": "640199958" }, ]

Application.h：

#import <Foundation/Foundation.h> @interface Application : NSObject @property (nonatomic, strong) NSString *displayName; @property (nonatomic, strong) NSString *developerName; @property (nonatomic, strong) NSString *identifier; - (instancetype)initWithDictionary:(NSDictionary *)dict; + (NSArray *)applicationsFromJSONAtPath:(NSString *)path; + (NSArray *)applicationsFromJSON:(id)JSON; @end

Application.m：

#import "Application.h" @implementation Application - (instancetype)initWithDictionary:(NSDictionary *)dict { self = [super init]; if (self) { self.displayName = dict[@"display_name"]; self.developerName = dict[@"developer_name"]; self.identifier = dict[@"identifier"]; } return self; } + (NSArray *)applicationsFromJSONAtPath:(NSString *)path { NSData *data = [NSData dataWithContentsOfFile:path]; NSArray *JSON = [[NSJSONSerialization JSONObjectWithData:data options:kNilOptions|NSJSONWritingPrettyPrinted error:nil] mutableCopy]; return [self applicationsFromJSON:JSON]; } + (NSArray *)applicationsFromJSON:(id)JSON { NSMutableArray *objects = [NSMutableArray new]; for (NSDictionary *dictionary in JSON) { Application *obj = [[Application alloc] initWithDictionary:dictionary]; [objects addObject:obj]; } return objects; } @end

JsonToArrayViewController.m：

#import "JsonToArrayViewController.h" #import "Application.h" static NSString *identifier = @"Cell"; @interface JsonToArrayViewController () @property(nonatomic,strong)NSArray* arrayData; @end @implementation JsonToArrayViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. } -(NSArray*)arrayData { if (!_arrayData) { NSString *path = [[NSBundle mainBundle] pathForResource:@"applications" ofType:@"json"]; _arrayData = [Application applicationsFromJSONAtPath:path]; } return _arrayData; } -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{ return self.arrayData.count; } -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier]; if (!cell) { cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier]; cell.backgroundColor = [UIColor whiteColor]; cell.selectionStyle = UITableViewCellSelectionStyleGray; } Application *app = [[self arrayData] objectAtIndex:indexPath.row]; cell.textLabel.text = app.displayName; return cell; } -(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{ [tableView deselectRowAtIndexPath:indexPath animated:YES]; } @end

效果图如下：