[英]Connecting a viewcontroller to a delegate class - CLLocationManager / iOS8
While trying to link my view controller to a delegate class (that implements CLLocation call backs), I am getting an error when initializing my delegate. 尝试将我的视图控制器链接到委托类(实现CLLocation回调)时,初始化我的委托时遇到错误。
My VC.h: 我的VC.h:
@interface ViewController : UIViewController <MyLocationControllerDelegate> {
MyLocationController *CLController;
}
Instantiating MyLocationController in the main VC.m: 在主VC.m中实例化MyLocationController:
CLController = [[MyLocationController alloc] init]; CLController = [[[MyLocationController alloc] init]; CLController.locationManager.delegate = self;
CLController.locationManager.delegate =自我; [CLController.locationManager requestWhenInUseAuthorization];
[CLController.locationManager requestWhenInUseAuthorization]; CLController.locationManager.distanceFilter = kCLDistanceFilterNone;
CLController.locationManager.distanceFilter = kCLDistanceFilterNone; CLController.locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
CLController.locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; [CLController.locationManager startUpdatingLocation];
[CLController.locationManager startUpdatingLocation];
The class header file: 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
and .m file (where I get the error): 和.m文件(出现错误):
- (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;
}
I noticed that this error does not show up in previous iOS versions. 我注意到此错误在以前的iOS版本中没有出现。
Thanks for the help. 谢谢您的帮助。
According to the documentation , MyLocationController
must conform to CLLocationManagerDelegate
. 根据文档 ,
MyLocationController
必须符合CLLocationManagerDelegate
。
@interface MyLocationController: NSObject <CLLocationManagerDelegate>
@property (nonatomic, strong) CLLocationManager *locationManager;
@property (nonatomic, weak) id delegate;
@end
As a side note, you don't need to declare the iVars for the properties locationManager
and delegate
. 附带说明一下,您不需要为属性
locationManager
和delegate
声明iVars。 The iVars _locationManager
and _delegate
will be auto generated for you. iVars
_locationManager
和_delegate
将自动为您生成。
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