我正在尝试在我的 iOS 应用程序中实现一个带有 twitter 提要的 tableview。我已经按照教程进行操作，并且能够获取用户的 Twitter 提要。我找到了哈希标签的 url，但在实现时出现错误：
'NSInvalidArgumentException'，原因：'-[__NSCFString objectForKeyedSubscript:]：无法识别的选择器发送到实例 0xa0b7e20'
我试图做一些研究，但所有尝试都失败了。任何建议都会很棒。谢谢你。
。H
#import <UIKit/UIKit.h>
#import <Social/Social.h>
#import <Accounts/Accounts.h>
@interface ViewController : UIViewController<UITableViewDataSource, UITableViewDelegate>
@property (strong, nonatomic) IBOutlet UITableView *tweetTableView;
@property (nonatomic, copy) NSArray *dataSource;
-(IBAction)refresh:(id)sender;
@end
.m
@implementation ViewController
- (void)getTimeLine {
ACAccountStore *account = [[ACAccountStore alloc] init];
ACAccountType *accountType = [account
accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierTwitter];
[account requestAccessToAccountsWithType:accountType
options:nil completion:^(BOOL granted, NSError *error)
{
if (granted == YES)
{
NSArray *arrayOfAccounts = [account
accountsWithAccountType:accountType];
if ([arrayOfAccounts count] > 0)
{
ACAccount *twitterAccount = [arrayOfAccounts lastObject];
/* NSString * kTwitterHashtag = @"#nasa";
NSString * kTwitterUsername = @"";
// Looking for #kTwitterHashtag or @kTwitterUsername
NSString *urlString = [[[@"http://search.twitter.com/search.json?q=%23" stringByAppendingString:(NSString *)kTwitterHashtag]
stringByAppendingString:@"+OR+%40"] stringByAppendingString:(NSString *)kTwitterUsername];
NSURL *requestURL = [NSURL URLWithString:urlString];
*/
NSURL *requestURL = [NSURL URLWithString:@"http://api.twitter.com/1/statuses/home_timeline.json"];
NSMutableDictionary *parameters =
[[NSMutableDictionary alloc] init];
[parameters setObject:@"20" forKey:@"count"];
[parameters setObject:@"1" forKey:@"include_entities"];
SLRequest *postRequest = [SLRequest
requestForServiceType:SLServiceTypeTwitter
requestMethod:SLRequestMethodGET
URL:requestURL parameters:parameters];
postRequest.account = twitterAccount;
[postRequest performRequestWithHandler:
^(NSData *responseData, NSHTTPURLResponse
*urlResponse, NSError *error)
{
self.dataSource = [NSJSONSerialization
JSONObjectWithData:responseData
options:NSJSONReadingMutableLeaves
error:&error];
if (self.dataSource.count != 0) {
dispatch_async(dispatch_get_main_queue(), ^{
[self.tweetTableView reloadData];
NSLog(@"_dataSource.count %d",_dataSource.count);
for(NSDictionary * tweet in _dataSource){
NSLog(@"tweet : %@",tweet[@"text"]);
}
});
}
}];
}
} else {
// Handle failure to get account access
}
}];
}
- (void)viewDidLoad
{
[super viewDidLoad];
_tweetTableView = [[UITableView alloc] init];
_dataSource = [[NSArray alloc] init];
[self getTimeLine];
}
-(IBAction)refresh:(id)sender{
[self getTimeLine];
[self.tweetTableView reloadData];
}
#pragma mark -
#pragma mark UITableViewDataSource
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return _dataSource.count;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [self.tweetTableView
dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc]
initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
NSDictionary *tweet = _dataSource[[indexPath row]];
NSLog(@"tweet : %@",tweet);
cell.textLabel.text = tweet[@"text"];
return cell;
}
@end