我有一个搜索栏,搜索4square Api的场地。
有时,当我搜索特定单词并向下滚动时,我的应用程序会因空数组而崩溃。
以下是我的代码和错误代码。
*** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayI objectAtIndex:]: index 11 beyond bounds for empty array'
*** First throw call stack:
(0x335683e7 0x3b259963 0x334b321d 0xc7ce3 0x353c2569 0x353a7391 0x353be827 0x3537a8c7 0x35126513 0x351260b5 0x35126fd9 0x351269c3 0x351267d5 0x35126639 0x3353d941 0x3353bc39 0x334af263 0x334af0c9 0x3708d33b 0x353cb2b9 0xc173d 0x3b686b20)
libc++abi.dylib: terminate called throwing an exception
(lldb)
libsystem_kernel.dylib`__pthread_kill:
0x3b74d348: mov r12, #328
0x3b74d34c: svc #128
0x3b74d350: blo 0x3b74d368 ; __pthread_kill + 32
0x3b74d354: ldr r12, [pc, #4] ; __pthread_kill + 24
0x3b74d358: ldr r12, [pc, r12]
0x3b74d35c: b 0x3b74d364 ; __pthread_kill + 28
0x3b74d360: .long 0x01ac5cc4 ; unknown opcode
0x3b74d364: bx r12
0x3b74d368: bx lr
这是我的代码
RecipeDetailViewController.h
#import <UIKit/UIKit.h>
@interface RecipeDetailViewController : UIViewController <UITextFieldDelegate, UISearchBarDelegate, UITableViewDelegate, UITableViewDataSource, UISearchDisplayDelegate>{
UITableView *searchTableView;
UISearchBar *sBar;
UISearchDisplayController *searchDisplayController;
}
@property (strong, nonatomic) NSArray *loadedSearches;
@end
RecipeDetailViewController.m
#import "RecipeDetailViewController.h"
#import "AFJSONRequestOperation.h"
@interface RecipeDetailViewController ()
@end
@implementation RecipeDetailViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
self.title = @"Search";
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
searchTableView = [[UITableView alloc] initWithFrame:self.view.bounds];
searchTableView.delegate = self;
searchTableView.dataSource = self;
[self.view addSubview:searchTableView];
sBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 160, 44)];
sBar.placeholder = @"Search for Inspection Equipment...";
sBar.tintColor = [UIColor colorWithRed:red/255.0f green:green/255.0f blue:blue/255.0f alpha:1.0];
sBar.backgroundImage = [UIImage imageNamed:@"searchbarbackground.png"];
sBar.delegate = self;
searchDisplayController = [[UISearchDisplayController alloc] initWithSearchBar:sBar contentsController:self];
searchDisplayController.delegate = self;
searchDisplayController.searchResultsDataSource = searchTableView.dataSource;
searchDisplayController.searchResultsDelegate = searchTableView.delegate;
searchTableView.tableHeaderView = sBar;
// UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
// [refreshControl addTarget:self action:@selector(refreshView:) forControlEvents:UIControlEventValueChanged];
// [searchTableView addSubview:refreshControl];
}
-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
NSString *searchQuery = [NSString stringWithFormat:@"https://api.foursquare.com/v2/venues/search?ll=40.4263,-86.9177&client_id=EI10B1E0VF2KGLXL4G5YXQVSNGXD4ABXUHOYN3RWKY3ZUPD0&client_secret=D4BT4LC3MTNULCGLC30YKWITCHIOURNOEXRR04AL3H4YUVKK&v=20121223&query='%@'",searchText];
searchQuery = [searchQuery stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *url = [[NSURL alloc] initWithString:searchQuery];
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request
success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON)
{
self.loadedSearches = JSON[@"response"][@"venues"];
// refreshing the TableView when the block gets the response
[searchTableView reloadData];
}
failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON)
{
NSLog(@"%@", error.localizedDescription);
}];
[operation start];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return self.loadedSearches.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
if(cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"];
}
cell.textLabel.text = self.loadedSearches[indexPath.row][@"name"];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"TableCell Tapped" message:@"Yeah you tapped a table cell" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
[alert show];
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
答案 0 :(得分:1)
您可以尝试在viewDidLoad中初始化loadedSearches NSArray吗?