IOS 8 Objective-Csearch栏和表格视图使用Google自动完成

我是iOS开发的新手，现在我一直被这个问题困住了两个星期。我正在尝试使用Googlesearch结果中的自动完成function创buildsearch栏。我已经能够做到的最接近的是通过Hybrid Forge学习本教程。（我发现的其他教程不使用ARC，已经非常过时了。）

我能够看到URL连接通过NSLog正常工作，但问题在于我重新分配我的build议数组。如果我注释掉这部分：

_suggestionArray = [NSArray arrayWithArray:json[@"responseData"][@"results"]]; [_tableView reloadData];

它给出了这个错误：

 [__NSCFDictionary isEqualToString:]: unrecognized selector sent to instance 0x7f968be3a060 2015-05-21 17:43:11.277 AutoComplete[865:65704] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary isEqualToString:]: unrecognized selector sent to instance 0x7f968be3a060' *** First throw call stack: ( 0 CoreFoundation 0x00000001077daa75 __exceptionPreprocess + 165 1 libobjc.A.dylib 0x0000000107473bb7 objc_exception_throw + 45 2 CoreFoundation 0x00000001077e1d1d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205 3 CoreFoundation 0x00000001077399dc ___forwarding___ + 988 4 CoreFoundation 0x0000000107739578 _CF_forwarding_prep_0 + 120 5 UIKit 0x0000000107f4cdbd -[UITableViewLabel setText:] + 81 6 AutoComplete 0x0000000106f40acd -[ViewController tableView:cellForRowAtIndexPath:] + 333 7 UIKit 0x0000000107cc1e03 -[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 508 8 UIKit 0x0000000107ca1901 -[UITableView _updateVisibleCellsNow:isRecursive:] + 2846 9 UIKit 0x0000000107cb778c -[UITableView layoutSubviews] + 213 10 UIKit 0x0000000107c441c3 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 521 11 QuartzCore 0x000000010b4d6c58 -[CALayer layoutSublayers] + 150 12 QuartzCore 0x000000010b4cb87e _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380 13 QuartzCore 0x000000010b4cb6ee _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24 14 QuartzCore 0x000000010b43936e _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 242 15 QuartzCore 0x000000010b43a482 _ZN2CA11Transaction6commitEv + 390 16 QuartzCore 0x000000010b43aaed _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 89 17 CoreFoundation 0x000000010770f507 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23 18 CoreFoundation 0x000000010770f460 __CFRunLoopDoObservers + 368 19 CoreFoundation 0x0000000107705293 __CFRunLoopRun + 1123 20 CoreFoundation 0x0000000107704bc6 CFRunLoopRunSpecific + 470 21 GraphicsServices 0x000000010adcaa58 GSEventRunModal + 161 22 UIKit 0x0000000107bca580 UIApplicationMain + 1282 23 AutoComplete 0x0000000106f41663 main + 115 24 libdyld.dylib 0x0000000109d88145 start + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)

这是我的代码如下：[ViewController.h]

 #import <UIKit/UIKit.h> @interface ViewController : UIViewController @property (weak, nonatomic) IBOutlet UITableView *tableView; @property (weak, nonatomic) IBOutlet UISearchBar *searchBar; @property (strong, readwrite, nonatomic) NSArray *suggestionArray; @end

[ViewController.m]

 #import "ViewController.h" @interface ViewController () @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } #pragma mark - UITableViewDataSource Methods - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return _suggestionArray.count; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if(cell == nil) { cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; } cell.textLabel.text = [_suggestionArray objectAtIndex:indexPath.row]; return cell; } #pragma mark - UITableViewDelegate Methods - (void)tableView:(NSIndexPath *)indexPath { _searchBar.text = [_suggestionArray objectAtIndex:indexPath.row]; } - (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText { [searchText stringByReplacingOccurrencesOfString:@" " withString:@"+"]; [searchText stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; NSLog(@"%@", searchText); NSURLSession *session = [NSURLSession sharedSession]; NSURLSessionDataTask *dataTask = [session dataTaskWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://ajax.googleapis.com/ajax/services/search/web?v=1.0&rsz=large&q=%@",searchText]] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil]; NSLog(@"connection test marker"); NSLog(@"%@", [NSArray arrayWithArray:json[@"responseData"][@"results"]]); //_suggestionArray = [NSArray arrayWithArray:[NSArray arrayWithArray:json[@"responseData"][@"results"]]]; //[_tableView reloadData]; }]; [dataTask resume]; } @end

我也做了Ctrl +从search显示控制器拖到表视图，并select“searchResultsDelegate”（把它放在这里，以防万一）。

任何帮助将不胜感激。谢谢！ 🙂

 NSURLSessionDataTask *dataTask = [session dataTaskWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://ajax.googleapis.com/ajax/services/search/web?v=1.0&rsz=large&q=%@",searchText]] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil]; if(!json){ // is a valid json ? return; } NSDictionary * jsonDict = [json objectForKey:@"responseData"]; _suggestionArray = = [jsonDict objectForKey:@"results"] [_tableView reloadData]; }];

然后改变键（例如：“titleNoFormatting”）

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if(cell == nil) { cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; } cell.textLabel.text = [[_suggestionArray objectAtIndex:indexPath.row] valueForKey:@"titleNoFormatting"]; return cell;

}