iOS8、Xcode6上地图定位不调用代理方法的解决方法(一)

IDE:Xcode Version 6.1 (6A1052d),系统:OS X Yosemite 10.10.2 (14C109)

使用 CoreLocation/CoreLocation.h 定位时，出现了 CLLocationManagerDelegate 方法不调用的问题。

主要代码如下: #import “ViewController.h” #import <CoreLocation/CoreLocation.h>

@interface ViewController ()<CLLocationManagerDelegate>
@property (nonatomic,strong)CLLocationManager *mgr;
@end

@implementation ViewController	
// 懒加载
- (CLLocationManager *)mgr {
    
    if (_mgr == nil) {
        _mgr = [[CLLocationManager alloc] init];
        _mgr.delegate = self;
    }
    return _mgr;
}

- (void)viewDidLoad {
    [super viewDidLoad];	    
    // 开始定位
    [self.mgr startUpdatingLocation];	    
}

#pragma mark - 实现代理方法
/**
 *  获取位置
 *
 *  @param locations 获取经度、纬度
 */
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
    
    CLLocation *location = [locations lastObject];
    CLLocationCoordinate2D coordinate = location.coordinate;
    NSLog(@"纬度：%f  经度：%f",coordinate.latitude,coordinate.longitude);
    
}

/**
 *  错误信息
 *
 *  @param error   位置获取失败时显示的信息
 */
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {	
    NSLog(@"%@",error);	
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

方法中，在懒加载处 _mgr.delegate = self ,@interface 处也写明了 ,之后写了获取位置的代理方法，locationManager:didUpdateLocations: ，看似没啥错误了，代理方法就是不执行...

解决办法:

在 info.plist 文件中添加 NSLocationAlwaysUsageDescription NSLocationWhenInUseUsageDescription 这两个字段

还有一个操作就是:

在 CoreLocation 前调用

requestWhenInUseAuthorization() 或者 ​	
requestAlwaysAuthorization() 到这里，运行代码，问题已经解决

附修改后的代码

#import "ViewController.h"
#import <CoreLocation/CoreLocation.h>	
@interface ViewController ()<CLLocationManagerDelegate>
@property (nonatomic,strong)CLLocationManager *mgr;
@end

@implementation ViewController	    	
// 懒加载
- (CLLocationManager *)mgr {
    	    
    if (_mgr == nil) {
        _mgr = [[CLLocationManager alloc] init];
        _mgr.delegate = self;
        [_mgr requestAlwaysAuthorization];
    }
    return _mgr;
}

- (void)viewDidLoad {
    [super viewDidLoad];	    
    // 开始定位
    [self.mgr startUpdatingLocation];	    
}

#pragma mark - 实现代理方法
/**
 *  获取位置
 *
 *  @param locations 获取经度、纬度
 */
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
    
    CLLocation *location = [locations lastObject];
    CLLocationCoordinate2D coordinate = location.coordinate;
    NSLog(@"纬度：%f  经度：%f",coordinate.latitude,coordinate.longitude);
    
}
/**
 *  错误信息
 *
 *  @param error   位置获取失败时显示的信息
 */
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {	
    NSLog(@"%@",error);	
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

info.plist 文件前后对比