点击特定地址单元格时Google Maps搜索栏触发NSRangeException异常求助

Problem Overview #

I’m displaying addresses in a search bar, but tapping a corresponding table view cell triggers an immediate crash with this error message:

Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSSingleObjectArrayI objectAtIndex:]: index 1 beyond bounds [0 .. 0]'

Relevant code snippet from the tableView(_:didSelectRowAt:) method:

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    self.dismiss(animated: true, completion: nil)
    let urlpath = "https://maps.googleapis.com/maps/api/geocode/json?address=\(self.searchRes..."
    // Remaining code to handle the API request
}

Solution Breakdown #

This is a classic array out-of-bounds error—you’re trying to access index 1 of an array that only contains one element (valid index range is [0..0]). Here’s how to fix it step by step:

1. Fix Invalid Array Index Access #

The crash occurs because you’re either hardcoding index 1 when accessing self.searchRes, or you’re not validating that the selected row’s index exists in the array. Replace unsafe index access with a safety check and use the tapped row’s actual index:

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    self.dismiss(animated: true, completion: nil)
    
    // Guard against out-of-bounds index
    guard indexPath.row < self.searchRes.count else {
        print("Selected index is outside the range of search results!")
        return
    }
    
    // Get the address from the tapped row
    let selectedAddress = self.searchRes[indexPath.row]
    
    // URL-encode the address to handle spaces/special characters (critical for API requests)
    guard let encodedAddress = selectedAddress.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) else {
        print("Failed to encode address for API request!")
        return
    }
    
    let urlpath = "https://maps.googleapis.com/maps/api/geocode/json?address=\(encodedAddress)"
    // Proceed with your API request logic...
}

2. Debug the searchRes Array #

To prevent this issue from recurring, add debug prints when you populate searchRes to verify its contents and count:

// When you load or update your search results:
print("Total search results: \(searchRes.count)")
print("Search results content: \(searchRes)")

This will help you confirm if the array is being populated correctly and matches your expected number of elements.

3. Handle Edge Cases #

Add logic to handle empty search results (e.g., show a "No results found" label in your table view) to prevent users from tapping empty cells entirely.

内容的提问来源于stack exchange，提问作者user9395315