获取JSON数据并在iOS中填充TableView

Question

晚上好!

我需要一些帮助。我得到一些数据从谷歌的地方API JSON格式，但我没有得到在iPad中填充TableView(基于SplitView的应用程序)。我是从iOS开发开始的，所以可能会有很多错误!我使用了一个项目示例，该示例使用Twitter API检索帖子，并重新命名JSON数据名称。

我有四个文件在项目中使用并实现函数:

SimpleSplitController.h
SimpleSplitController.m
SplitSampleAppDelegate.h
SplitSampleAppDelegate.m

我得到一个错误在SplitSampleDelegate。

如果有人可以帮助我，我将非常感激!

下面是实现的代码:

SplitSampleAppDelegate.h

#import <UIKit/UIKit.h>
@class APTabBarControllerForSplitController;
@interface SplitSampleAppDelegate : NSObject <UIApplicationDelegate, UITabBarControllerDelegate> {
    NSMutableData *responseData;
    NSMutableArray *tweets;
}
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet APTabBarControllerForSplitController *tabBarController;
@property (nonatomic, retain) NSMutableArray *tweets;
@end

SplitSampleAppDelegate.m

#import "SplitSampleAppDelegate.h"
#import "APTabBarControllerForSplitController.h"
@implementation SplitSampleAppDelegate
@synthesize window=_window;
@synthesize tabBarController=_tabBarController;
@synthesize tweets;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.tabBarController.delegate = self;
    // Override point for customization after application launch.
    // Add the tab bar controller's current view as a subview of the window
    // Add the view controller's view to the window and display.
    responseData = [[NSMutableData data] retain];
    tweets = [NSMutableArray array];
    NSURLRequest *request = [NSURLRequest requestWithURL:
                             [NSURL URLWithString:@"https://maps.googleapis.com/maps/api/place/search/json?location=-15.815347,-47.9164097&radius=500&types=restaurant&sensor=true&key=AIzaSyBLY-lBALViJ6ybrgtOqQGhsCDQtsdKsnc"]];
    [[NSURLConnection alloc] initWithRequest:request delegate:self];

    self.window.rootViewController = self.tabBarController;
    [self.window makeKeyAndVisible];
    return YES;
}
#pragma mark NSURLConnection delegate methods
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    [responseData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [responseData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    [connection release];
    NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
    [responseData release];
    NSDictionary *results = [responseString JSONValue];
    NSMutableArray *allTweets = [results objectForKey:@"results"];
    //This is the part that I get an ERROR
    [viewController setTweets:allTweets];
    [window addSubview:viewController.view];
    [window makeKeyAndVisible];
}

SimpleSplitController.h

#import <UIKit/UIKit.h>
#import "APSplitViewController.h"
#import <MapKit/MapKit.h>
@interface SimpleSplitController : APSplitViewController {
    NSMutableData *responseData;
    NSArray *tweets;
}
@property (nonatomic, retain) UIViewController *left;
@property (nonatomic, retain) UIViewController *right;
@property (nonatomic, retain) NSArray *tweets;
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context;
@end

SimpleSplitController.m

#import "SimpleSplitController.h"
#import <QuartzCore/QuartzCore.h>
#import "JSON/JSON.h"
#import "Tweet.h"
@interface SimpleSplitController()
- (UIColor *) randomColor;
- (UIViewController*) randomViewController1;
- (UIViewController*) randomViewController2;
- (UIViewController*) randomViewController3;
- (void) buttonPushRandomViewController1;
- (void) buttonPushRandomViewController2;
@end
@implementation SimpleSplitController
@synthesize left, right;
@synthesize tweets;
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
    }
    // Configure the cell...
    NSDictionary *aTweet = [tweets objectAtIndex:[indexPath row]];
    cell.textLabel.text = [aTweet objectForKey:@"name"];
    cell.textLabel.adjustsFontSizeToFitWidth = YES;
    cell.textLabel.font = [UIFont systemFontOfSize:12];
    cell.textLabel.minimumFontSize = 10;
    cell.textLabel.numberOfLines = 4;
    cell.textLabel.lineBreakMode = UILineBreakModeWordWrap;
    cell.detailTextLabel.text = [aTweet objectForKey:@"vicinity"];
    NSURL *url = [NSURL URLWithString:[aTweet objectForKey:@"icon"]];
    NSData *data = [NSData dataWithContentsOfURL:url];
    cell.imageView.image = [UIImage imageWithData:data];
    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    return cell;
}

Answer 1

很可能你错了。您正在检查对象，而不是值。

 NSMutableArray *allTweets = [results valueForKey:@"results"];