將ViewController連接到委托類-CLLocationManager / iOS8

Question

嘗試將我的視圖控制器鏈接到委托類（實現CLLocation回調）時，初始化我的委托時遇到錯誤。

我的VC.h：

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

在主VC.m中實例化MyLocationController：

CLController = [[[MyLocationController alloc] init]; CLController.locationManager.delegate =自我; [CLController.locationManager requestWhenInUseAuthorization]; CLController.locationManager.distanceFilter = kCLDistanceFilterNone; CLController.locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; [CLController.locationManager startUpdatingLocation];

類頭文件：

#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（出現錯誤）：

- (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;
}

我注意到此錯誤在以前的iOS版本中沒有出現。

謝謝您的幫助。

Answer 1

根據文檔 ， MyLocationController必須符合CLLocationManagerDelegate 。

@interface MyLocationController: NSObject <CLLocationManagerDelegate>

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

@end

附帶說明一下，您不需要為屬性locationManager和delegate聲明iVars。 iVars _locationManager和_delegate將自動為您生成。