我的应用程序在启动后立即崩溃

Question

正如标题所写，我的应用程序在启动后立即崩溃。我真的不知道，该怎么办。谢谢你的帮助。这是代码：

#import "ViewController.h"
@import CoreLocation;

@interface ViewController () <CLLocationManagerDelegate>
@property (strong, nonatomic) CLLocationManager *locationManager;
@property (weak, nonatomic) IBOutlet UILabel *location;
@property (weak, nonatomic) IBOutlet UILabel *date;
@end

@implementation ViewController
-(void)viewDidLoad
{
    [super viewDidLoad];

    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;

    if ([self.locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) {
        [self.locationManager requestWhenInUseAuthorization];
    }

    [self.locationManager startUpdatingLocation];

    //date
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

    [dateFormatter setDateFormat:@"MMMM d, YYYY"];

    NSString *dateString = [dateFormatter stringFromDate:[NSDate date]];
    NSLog(@"%@", dateString);
    self.date.text = (@"%@", dateString);
}

-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    NSLog(@"%@", [locations lastObject]);
    self.location.text = (@"%@", [locations lastObject]);
}

@end

崩溃后显示： http://i.stack.imgur.com/k0eVO.png

Answer 1

在您的应用中应用异常断点并重试。它会告诉您崩溃的确切位置

Answer 2

您的代码不完整，您可以检查一下并重新发布一次

你有

@selector(requestWhenInUseAuthorization) 

你还没有设置函数requestWhenInUseAuthorization

您将下面的代码放在哪个方法中。您已将它放在 viewDidLoad 下方，但它不在任何方法中。正确检查您的代码

[self.locationManager startUpdatingLocation];

 //date
 NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

 [dateFormatter setDateFormat:@"MMMM d, YYYY"];

 NSString *dateString = [dateFormatter stringFromDate:[NSDate date]];
 NSLog(@"%@", dateString);
 self.date.text = (@"%@", dateString);
}