ios - 将 View Controller 连接到委托(delegate)类 - CLLocationManager/iOS8

Question

在尝试将我的 View Controller 链接到委托(delegate)类(实现 CLLocation 回调)时，我在初始化委托(delegate)时遇到错误。

我的 VC.h:

@interface ViewController : UIViewController <MyLocationControllerDelegate> {
  MyLocationController *CLController;
}

在主 VC.m 中实例化 MyLocationController:

CLController = [[MyLocationController 分配] 初始化]; CLController.locationManager.delegate = self; [CLController.locationManager requestWhenInUseAuthorization]; CLController.locationManager.distanceFilter = kCLDistanceFilterNone; CLController.locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; [CLController.locationManager startUpdatingLocation];

类头文件:

#import <Foundation/Foundation.h>
#import <CoreLocation/CoreLocation.h>

@protocol MyLocationControllerDelegate;

@interface MyLocationController: NSObject {
    CLLocationManager *locationManager;
   __weak id delegate;

}

@property (nonatomic, strong) CLLocationManager *locationManager;
@property (nonatomic, weak) id delegate;

@end

和 .m 文件(我收到错误的地方):

- (id)init 
{
    self = [super init];

    if(self != nil) {
        self.locationManager = [[CLLocationManager alloc] init]; // Create new instance of locationManager
        self.locationManager.delegate = self; // Set the delegate as self.

    }

    return self;
}

我注意到这个错误不会出现在以前的 iOS 版本中。

感谢您的帮助。

Answer 1

根据 the documentation , MyLocationController 必须符合 CLLocationManagerDelegate。

@interface MyLocationController: NSObject <CLLocationManagerDelegate>

@property (nonatomic, strong) CLLocationManager *locationManager;
@property (nonatomic, weak) id delegate;

@end

附带说明一下，您不需要为属性 locationManager 和 delegate 声明 iVar。 iVars _locationManager 和 _delegate 将为您自动生成。