Question

在尝试将我的视图控制器链接到委托类（实现CLLocation回调）时，我在初始化委托时遇到错误。

我的VC.h：

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

在主VC.m中实例化MyLocationController：

CLController = [[MyLocationController alloc] init]; 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）：

- (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;
}

我注意到以前的iOS版本中没有显示此错误。

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

作为旁注，您无需为属性locationManager和delegate声明iVar。将自动为您生成iVars _locationManager和_delegate。

将viewcontroller连接到委托类--CLLocationManager / iOS8

1 个答案: