Question

当我尝试在模拟器（3.1.3，Xcode 3.1.4）上启动我的应用程序时，它会显示objc_msgSend并且应用程序无法启动。仅当我分配NSMUtable数组时才会发生这种情况这是我的代码部分，在viewDidLoad中，

 -(void)viewDidLoad{

   locationArray = [[NSMutableArray alloc] initWithObjects:@"new delhi", @"faridabad",@"meerut"];
   str1=[locationArray objectAtIndex:0];
   str2=[locationArray objectAtIndex:1];

      [super viewDidLoad];
 }

然后我想在以下方法中使用locationArray对象;

 -(CLLocationCoordinate2D) addressLocation1{

double latitude = 0.0;
double longitude = 0.0;
NSString *str= [locationArray NSString *str= [locationArray objectAtIndex:0];

    //NSString *str= @"new delhi"

NSString *urlString = [NSString stringWithFormat:@"http://maps.google.com/maps/geo?q=%@&output=csv", 
                       [str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSString *locationString = [NSString stringWithContentsOfURL:[NSURL URLWithString:urlString]];
NSArray *listItems = [locationString componentsSeparatedByString:@","];


if([listItems count] >= 4 && [[listItems objectAtIndex:0] isEqualToString:@"200"]) {
    latitude = [[listItems objectAtIndex:2] doubleValue];
    longitude = [[listItems objectAtIndex:3] doubleValue];
}
else {
    //Show error
}

CLLocationCoordinate2D location;
location.latitude = latitude;
location.longitude = longitude;


return location;

   }

问题只有在分配locationArray 时才会出现问题，请帮忙感谢

Answer 1

locationArray = [[NSMutableArray alloc] initWithObjects:@"new delhi", @"faridabad",@"meerut"];

尝试

locationArray = [[NSMutableArray alloc] initWithObjects:@"new delhi", @"faridabad",@"meerut", nil];

从The NSArray docs开始，您会看到initWithObjects:需要nil终止。如果您不想这样做，并且您知道自己拥有多少，则可以使用initWithObjects:count:

Objc_msgSend和app崩溃

1 个答案: