通常，这段代码对我来说非常有效，直到最近我去更新项目以支持最新的iOS，并且在单击地图按钮时收到错误；
Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArray0 objectAtIndex:]: index 0 beyond bounds for empty NSArray'
在使用Xcode 9之前，它可以正常工作，所以我猜现在代码的工作方式略有不同。
该数组为NSArray *arr_OfCountryCode;
然后我们在viewDidLoad
//Initialize NSArray object with Images
arr_OfCountryCode=@[@"AF",@"AL",@"DZ",@"AS",@"AD",@"AO",@"AI",@"AQ",@"AG",@"AR",@"AM",@"AW",@"AC",@"AU",@"AT",@"AZ",@"BS",@"BH",@"BD",@"BB",@"BY",@"BE",@"BZ",@"BJ",@"BM",@"BT",@"BO",@"BA",@"BW",@"BV",@"BR",@"IO",@"VG",@"BN",@"BG",@"BF",@"BI",@"KH",@"CM",@"CA",@"IC",@",CV",@"BQ",@"KY",@"CF",@"EA",@"TD",@"CL",@"CN",@"CX",@"CP",@"CC",@"CO",@"KM",@"CD",@"CG",@"CK",@"CR",@"HR",@"CU",@"CW",@"CY",@"CZ",@"CI",@"DK",@"DG",@"DJ",@"DM",@"DO",@"EC",@"EG",@"SV",@"GQ",@"ER",@"EE",@"ET",@"FK",@"FO",@"FJ",@"FI",@"FR",@"FG",@"PF",@"TF",@"GA",@"GM",@"GE",@"DE",@"GH",@"GI",@"GR",@"GL",@"GD",@"GP",@"GU",@"GT",@"GG",@"GN",@"GW",@"GY",@"HT",@"HM",@"HN",@"HK",@"HU",@"IS",@"IN",@"ID",@"IR",@"IQ",@"IE",@"IM",@"IL",@"IT",@"JM",@"JP",@"JE",@"JO",@"KZ",@"KE",@"KI",@"XK",@"KW",@"KG",@"LA",@"LV",@"LB",@"LS",@"LR",@"LY",@"LI",@"LT",@"LU",@"MO",@"MK",@"MG",@"MW",@"MY",@"MV",@"ML",@"MT",@"MH",@"MQ",@"MR",@"MU",@"YT",@"MX",@"FM",@"MD",@"MC",@"MN",@"ME",@"MS",@"MA",@"MZ",@"MM",@"NA",@"NR",@"NP",@"NL",@"NC",@"NZ",@"NI",@"NE",@"NG",@"NU",@"NF",@"KP",@"MP",@"NO",@"OM",@"PK",@"PW",@"PS",@"PA",@"PG",@"PY",@"PE",@"PH",@"PN",@"PL",@"PT",@"PR",@"QA",@"RO",@"RU",@"RW",@"RE",@"WS",@"SM",@"SA",@"SN",@"RS",@"SC",@"SL",@"SG",@"SX",@"SK",@"SI",@"SB",@"SO",@"ZA",@"GS",@"KR",@"SS",@"ES",@"LK",@"BL",@"SH",@"KN",@"LC",@"MF",@"PM",@"VC",@"SD",@"SR",@"SJ",@"SZ",@"SE",@"CH",@"SY",@"ST",@"TW",@"TJ",@"TZ",@"TH",@"TL",@"TG",@"TK",@"TO",@"TT",@"TA",@"TN",@"TR",@"TM",@"TC",@"TV",@"UM",@"VI",@"UG",@"UA",@"AE",@"GB",@"US",@"UY",@"UZ",@"VU",@"VA",@"VE",@"VN",@"WF",@"EH",@"YE",@"ZM",@"ZW",@"AX"];
当用户点击按钮时，会在actionMethod中随机显示地图上的位置；
str_Type = @"Randum";
self.mapView.hidden = NO;
int randomIndex = arc4random() % [arr_OfCountryCode count];
NSString *urlString = [NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/geocode/json?address=%@&sensor=false",[arr_OfCountryCode objectAtIndex:randomIndex]];
NSURL *url = [[NSURL alloc] initWithString:urlString];
我正在为数组在最新版本之前可用于多个iOS版本和设备而为何将数组分类为空而苦苦挣扎。
当我在Xcode中检查它时，它显示为nil，其他数组在初始化之前都没有问题，我什至尝试复制一个现有数组，将其重命名为*arr_OfCountryCode;，但仍然显示为nil！
在这种方法中（下面有整个文章），我相信是问题所在。
- (IBAction)actionMethod:(UIButton *)sender {
if ([sender tag] == 0) {
self.musicView.hidden = NO;
[self.tbl_MusicTable reloadData];
} else if ([sender tag] == 1) {
str_Type = @"Randum";
self.mapView.hidden = NO;
int randomIndex = arc4random() % [arr_OfCountryCode count];
NSString *urlString = [NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/geocode/json?address=%@&sensor=false",[arr_OfCountryCode objectAtIndex:randomIndex]];
NSURL *url = [[NSURL alloc] initWithString:urlString];
[NSURLConnection sendAsynchronousRequest:[[NSURLRequest alloc] initWithURL:url] queue:[[NSOperationQueue alloc] init] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
if (error) {
NSLog(@"%@",error.description);
} else {
NSDictionary *jsonObject=[NSJSONSerialization
JSONObjectWithData:data
options:NSJSONReadingMutableLeaves
error:nil];
NSDictionary *places = [[[[jsonObject objectForKey:@"results"] objectAtIndex:0] objectForKey:@"geometry"] objectForKey:@"location"];
NSDictionary *locations = [[[jsonObject objectForKey:@"results"] objectAtIndex:0] objectForKey:@"address_components"];
float lat = [[places objectForKey:@"lat"] floatValue];
float lon = [[places objectForKey:@"lng"] floatValue];
MKCoordinateRegion region;
MKCoordinateSpan span;
span.latitudeDelta = 0.50;
span.longitudeDelta = 0.50;
location.latitude = lat;
location.longitude = lon;
region.span = span;
region.center = location;
[self.mk_MapView setRegion:region animated:YES];
NSString *str_Title = [[locations valueForKey:@"long_name"] objectAtIndex:0];
NSString *str_Short = [[locations valueForKey:@"short_name"] objectAtIndex:0];
MKPointAnnotation *point = [[MKPointAnnotation alloc] init];
point.coordinate = location;
point.title = str_Title;
point.subtitle = str_Short;
[self.mk_MapView addAnnotation:point];
}
}];
}
}
进一步的核心定位代码在这里
#pragma mark - CLLocationManager Delegate Method
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
if ([str_Type isEqualToString:@"Custom"]) {
CLLocation *currentLocation = newLocation;
NSString *str_Longitude;
NSString *str_Latitude;
MKCoordinateRegion region;
MKCoordinateSpan span;
span.latitudeDelta = 0.020;
span.longitudeDelta = 0.020;
location.latitude = currentLocation.coordinate.latitude;
location.longitude = currentLocation.coordinate.longitude;
region.span = span;
region.center = location;
[self.mk_MapView setRegion:region animated:YES];
if (currentLocation != nil) {
str_Longitude = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.longitude];
str_Latitude = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.latitude];
}
// Reverse Geocoding
[geocoder reverseGeocodeLocation:currentLocation completionHandler:^(NSArray *placemarks, NSError *error) {
if (error == nil && [placemarks count] > 0) {
placemark = [placemarks lastObject];
MKPointAnnotation *point = [[MKPointAnnotation alloc] init];
point.coordinate = currentLocation.coordinate;
point.title = placemark.country;
point.subtitle = placemark.locality;
[self.mk_MapView addAnnotation:point];
} else {
NSLog(@"%@", error.debugDescription);
}
} ];
} else {
MKPointAnnotation *point = [[MKPointAnnotation alloc] init];
point.coordinate = location;
point.title = placemark.country;
point.subtitle = placemark.locality;
[self.mk_MapView addAnnotation:point];
}
}
#pragma mark - MKMapView Delegate Methods
-(MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:(id <MKAnnotation>)annotation
{
MKAnnotationView *pinView = nil;
if(annotation != self.mk_MapView.userLocation)
{
static NSString *defaultPinID = @"com.invasivecode.pin";
pinView = (MKAnnotationView *)[self.mk_MapView dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
if ( pinView == nil )
pinView = [[MKAnnotationView alloc]
initWithAnnotation:annotation reuseIdentifier:defaultPinID];
//pinView.pinColor = MKPinAnnotationColorGreen;
pinView.canShowCallout = YES;
//pinView.animatesDrop = YES;
pinView.image = [UIImage imageNamed:@"HesOnThisMap"]; //
}
else {
//[self.mk_MapView.userLocation setTitle:@"I am here"];
}
return pinView;
}
- (void)mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views {
MKAnnotationView *aV;
for (aV in views) {
CGRect endFrame = aV.frame;
aV.frame = CGRectMake(aV.frame.origin.x, aV.frame.origin.y - 230.0, aV.frame.size.width, aV.frame.size.height);
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.45];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[aV setFrame:endFrame];
[UIView commitAnimations];
}
}
答案 0 :(得分：0)
这与google maps api回调有关，当它达到最大回调时崩溃了