获取UITableView来填充来自另一个类的数据
我对Objective-C相当陌生，这是我第一次尝试实现MVC。 我有一个模型类，其中我有一个NSArray将填充来自JSON对象的数据。 我想填充我的UITableView （在我的视图控制器类），从这个数组中的对象。
请查看我的代码：
Droplets.h
@interface Droplets : NSObject { NSArray *dropletsArray; } // Get droplets data - (void) getDropletsList; //Object initilization - (id) init; //Public properties @property (strong, nonatomic) NSArray *dropletsArray; // Used to store the selected JSON data objects @end
Droplets.m
#define kBgQueue dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0) #define kDigialOceanApiURL [NSURL URLWithString:@"http://inspiredwd.com/api-test.php"] //Droplets API call #import "Droplets.h" @interface Droplets () //Private Properties @property (strong, nonatomic) NSMutableData *data; // Used to store all JSON data objects @end @implementation Droplets; @synthesize dropletsArray; @synthesize data; - (id)init { self = [super init]; if (self) { } return self; } - (void) getDropletsList { [UIApplication sharedApplication].networkActivityIndicatorVisible = YES; NSURL *url = kDigialOceanApiURL; // Predefined Digital Ocean URL API http request NSURLRequest *request = [NSURLRequest requestWithURL:url]; [NSURLConnection connectionWithRequest:request delegate:self]; //Should be: [[NSURLConnection alloc]initiWithRequest:request delegate:self]; ...however the instance of NSURLConnection is never used, which results in an "entity unsed" error. } - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { data = [[NSMutableData alloc]init]; // mutable data dictionary is allocated and initilized } - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)theData { [data appendData:theData]; // append 'theData' to the mutable data dictionary } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; //JSON foundation object returns JSON data from a foundation object. Assigned returned data to a dictionary 'json'. NSDictionary* jsonData = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:0]; self.dropletsArray = [jsonData objectForKey:@"droplets"]; //dictionary of arrays NSLog(@"Droplets %@", self.dropletsArray); } - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { // If the application is unable to connect to The Digital Ocean Server, then display an UIAlertView UIAlertView *errorView = [[UIAlertView alloc]initWithTitle:@"Error" message:@"Unable to connect to The Digital Ocean Server, please ensure that you are connected via either WIFI or 3G." delegate:nil cancelButtonTitle:@"Dismiss" otherButtonTitles:nil]; [errorView show]; [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; // Turn of the network activity indicator } @end
DropletsList.h
@class Droplets; @interface DropletsList : UITableViewController - (Droplets *) modelDroplets; @end
DropletsList.m
#define RGB(r, g, b) [UIColor colorWithRed:r/255.0 green:g/255.0 blue:b/255.0 alpha:1] @interface DropletsList () //Private properties @property (strong, nonatomic) Droplets *modelDroplets; @property (strong, nonatomic) NSArray *tableData; @end @implementation DropletsList @synthesize tableData; - (id)initWithStyle:(UITableViewStyle)style { self = [super initWithStyle:style]; if (self) { // Custom initialization NSLog(@"get my data from model"); } return self; } - (Droplets *) modelDroplets { if (!_modelDroplets) _modelDroplets = [[Droplets alloc]init]; return _modelDroplets; } - (void)viewDidLoad { [super viewDidLoad]; _modelDroplets = [[Droplets alloc]init]; self.tableData = [_modelDroplets dropletsArray]; [_modelDroplets getDropletsList]; [self.tableView reloadData]; // reload the droplets table controller } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } #pragma mark - Table view data source - (NSInteger)numberOfSectionsInTableView:(UITableView *)aTableView { return 1; // Return the number of sections. } - (NSInteger)tableView:(UITableView *)aTableView numberOfRowsInSection:(NSInteger)section { return [_modelDroplets.dropletsArray count]; // Return the number of rows in the section. } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { // The cell identified by "dropletsList", is assiged as the UITableViewCell UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"dropletsList"]; //NSLog(@"Droplets Name: %@",self.dropletsArray); // The UITableView text label is assigned the contents from 'dropletsArray', with the object key "name"- name of the droplet cell.textLabel.text=[[tableData objectAtIndex:indexPath.row]objectForKey:@"name"]; // The UITableView text detail label is assigned the contents from 'dropletsArray', with the object key "status"- status of the droplet cell.detailTextLabel.text=[[tableData objectAtIndex:indexPath.row]objectForKey:@"status"]; //Evalulate the status of each droplet, setting the colour appropriate to the staus if ([[[tableData objectAtIndex:indexPath.row] objectForKey:@"status"] isEqualToString:@"active"]) { //Set the detail text label colour cell.detailTextLabel.textColor = RGB (35,179,0); } return cell; } @end
基本上我的表不填充。 请有人可以帮忙吗？
- (void)viewDidLoad { [super viewDidLoad]; _modelDroplets = [[Droplets alloc]init]; self.tableData = [_modelDroplets dropletsArray]; [_modelDroplets getDropletsList]; [self.tableView reloadData]; // reload the droplets table controller }
在这个方法中，你从Web服务中获取液滴。 它是asynchronous的，到tableView重载数据时，它可能还没有完成获取数据。 你需要有一个callback，将完成webservice重新加载tableView。
编辑：
在Droplets创build一个类方法来获取所有数据
//Droplets.h typedef void (^NSArrayBlock)(NSArray * array); typedef void (^NSErrorBlock)(NSError * error); //Droplets.m + (void)getDropletsWithCompletion:(NSArrayBlock)arrayBlock onError:(NSErrorBlock)errorBlock { NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:kDigialOceanApiURL]; [urlRequest setHTTPMethod:@"GET"]; [urlRequest setCachePolicy:NSURLCacheStorageNotAllowed]; [urlRequest setTimeoutInterval:30.0f]; [urlRequest addValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; [NSURLConnection sendAsynchronousRequest:urlRequest queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *responseData, NSError *error) { if (error) { errorBlock(error); }else{ NSError *serializationError = nil; NSDictionary *json = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingAllowFragments error:&serializationError]; arrayBlock(json[@"droplets"]); } }]; } //DropletsList.h - (void)viewDidLoad { [super viewDidLoad]; [Droplets getDropletsWithCompletion:^(NSArray *array) { self.modelDroplets = droplets; [self.tableView reloadData]; } onError:^(NSError *error) { UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Error" message:error.localizedDescription delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil]; [alert show]; }]; }
免责声明：testing和validation:)