iphone - objective-c : strange error when init a variable declared in my header file

Question

当我添加以下行时，我得到:

locMan = [[CLLocationManager alloc] init];

对于我的.m文件中的viewDidLoad方法，我遇到了一些以前从未见过的错误。错误如下:

我一生都无法弄清楚为什么添加该行会引起问题。如果有人能阐明一点，我将不胜感激。

我有这个头文件:

#import <UIKit/UIKit.h>
#import "CoreLocation/CoreLocation.h"


@interface RobotWarsViewController : UIViewController 
<CLLocationManagerDelegate> {

    CLLocationManager *locMan;

    // Current Location View
    IBOutlet UIView  *currentLocationView;
    IBOutlet UILabel *currentLocationLabel;


}

@property (assign, nonatomic) UIView  *currentLocationView;
@property (assign, nonatomic) UILabel *currentLocationLabel;
@property (assign, nonatomic) CLLocationManager *locMan;                           

- (IBAction)dropEMP:(id)sender;
- (IBAction)armEMP:(id)sender;

@end

这个.m文件:

#import "RobotWarsViewController.h"

@implementation RobotWarsViewController


@synthesize locMan;
@synthesize currentLocationView;
@synthesize currentLocationLabel;

- (void)viewDidLoad {
    [super viewDidLoad];

    locMan = [[CLLocationManager alloc] init];
//  locMan.delegate = self;

}

- (IBAction)dropEMP:(id)sender{

    NSLog(@"Boo");

}

- (IBAction)armEMP:(id)sender{

    NSLog(@"boo");

}

- (void)locationManager:(CLLocationManager *)manager 
    didUpdateToLocation:(CLLocation *)newLocation 
           fromLocation:(CLLocation *)oldLocation {

    NSLog(@"location update");

}



- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (void)dealloc {
    [super dealloc];
    [currentLocationView release];
    [currentLocationLabel release];

}

@end

Answer 1

您是否将CoreLocation框架添加到您的项目中？

展开Frameworks组，然后查看那里是否列出了CoreLocation。如果没有，请右键单击它并添加。