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Xcode 4.5.1 中的搜索栏在我输入内容时崩溃，而当我使用 Xcode 4.4 时它工作得很好，请帮忙

我使用了这个代码，它是另一个问题的答案，当我使用 Xcode 4/4 时它工作得很好，直到我将它更新到 4.5.1

- (void) searchBarSearchButtonClicked:(UISearchBar *)theSearchBar{

//Perform the JSON query.

[self searchCoordinatesForAddress:[theSearchBar text]];

//Hide the keyboard.
[theSearchBar resignFirstResponder];}

-(void) searchCoordinatesForAddress:(NSString *)inAddress{

NSMutableString *urlString = [NSMutableString stringWithFormat:@"http://maps.google.com/maps/geo?q=%@&output=json",inAddress];

//Replace Spaces with a '+' character.
[urlString setString:[urlString stringByReplacingOccurrencesOfString:@" " withString:@"+"]];

NSURL *url = [NSURL URLWithString:urlString];

//Setup and start an async download.
//Note that we should test for reachability!.
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{

NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];


NSError *error;
NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *results = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];

NSArray *placemark  = [results objectForKey:@"Placemark"];
NSArray *coordinates = [[placemark objectAtIndex:0] valueForKeyPath:@"Point.coordinates"];

double longitude = [[coordinates objectAtIndex:0] doubleValue];
double latitude = [[coordinates objectAtIndex:1] doubleValue];



[self zoomMapAndCenterAtLatitude:latitude andLongitude:longitude];}
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