app is crashing without any error - ios

Question

I am trying to integrate the google map sdk and followed this link to start from google. I have created the API key and used it in appDelegate. I wrote below code in my ViewController.m and I have imported all the frameworks required, and also put the -ObjC in other linker flag but still the app is crashing on run time. I have used breakpoints but no log is been shown up. Below is the entire code and haven't used any outlet.
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad {
GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:-33.86
longitude:151.20 zoom:6];
mapView_ = [GMSMapView mapWithFrame:CGRectZero camera:camera]; // crashing here, even gave different frames rather CGRectZero
mapView_.myLocationEnabled = YES;
self.view = mapView_;
// Creates a marker in the center of the map.
GMSMarker *marker = [[GMSMarker alloc] init];
marker.position = CLLocationCoordinate2DMake(-33.86, 151.20);
marker.title = #"Sydney";
marker.snippet = #"Australia";
marker.map = mapView_;
}
#end
DEMO SAMPLE LINK

Answer 1

I downloaded the code and run it. It works perfectly well. Just remove the old app and clear the target. Re-install the app. It should work fine.

Answer 2

Why do you pass CGRectZero to the frame of the map?
Try the following code:-
- (void)viewDidLoad {
GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:-33.86
longitude:151.20 zoom:6];
mapView_ = [GMSMapView mapWithFrame:CGRectMake(0, 0, 320, 320) camera:camera]; // crashing here
mapView_.myLocationEnabled = YES;
[self.view addSubview:mapView_];
// Creates a marker in the center of the map.
GMSMarker *marker = [[GMSMarker alloc] init];
marker.position = CLLocationCoordinate2DMake(-33.86, 151.20);
marker.title = #"Sydney";
marker.snippet = #"Australia";
marker.map = mapView_;
}