关于ios:ReactiveCocoa框架程序定位

应用 RAC 形式与传统形式做定位性能的比照

首先，因为应用定位性能，所以要在 info.plist 文件外面做申请形容设置

增加上面两个字段：
Privacy – Location Always Usage Description
Privacy – Location When In Use Usage Description

而后是代码局部：

.h 文件
`#import “ViewController.h”

@import ReactiveCocoa;

@interface ViewController ()<CLLocationManagerDelegate>

@property (nonatomic,strong)CLLocationManager * manager;// 地位管理器
@property (nonatomic) CLGeocoder * geocoder;// 返地理位置编码
@property (weak, nonatomic) IBOutlet UILabel *placeLabel;

@end

@implementation ViewController

-(CLLocationManager *)manager{

if (!_manager) {_manager = [[CLLocationManager alloc]init];
    _manager.delegate = self;
}
return _manager;

}

-(CLGeocoder *)geocoder{

if (!_geocoder) {_geocoder = [[CLGeocoder alloc]init];
}
return _geocoder;

}

-(RACSignal *)authorizedSignal{

if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusNotDetermined) {[self.manager requestAlwaysAuthorization];

    return [[self rac_signalForSelector:@selector(locationManager:didChangeAuthorizationStatus:) fromProtocol:@protocol(CLLocationManagerDelegate)] map:^id(id value) {return @([value[1] integerValue] == kCLAuthorizationStatusAuthorizedAlways);

    }];
}
return [RACSignal return:@([CLLocationManager authorizationStatus]== kCLAuthorizationStatusAuthorizedAlways)];

}

(void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
// RACSequence * s1 = [[[@[@(1),@(2),@(3)] rac_sequence] map:^id(id value) {
//
// return @([value integerValue]+2);
// }] filter:^BOOL(id value) {
//
// return [value integerValue] <5;
// }];
//
// NSLog(@”%@”,[s1 array]);
// //3,4

// RACSequence * s1 = [@[@(1),@(2),@(3)] rac_sequence];
// RACSequence * s2 = [@[@(1),@(3),@(9)] rac_sequence];
//
// RACSequence s3 =[[@[s1,s2] rac_sequence] flattenMap:^RACStream (id value) {
//
// return [value filter:^BOOL(id value) {
//
// return [value integerValue] % 3 ==0;
// }];
// }];
// NSLog(@”%@”,[s3 array]);
// //3,3,9

// 知识点：获取某个对象的属性时，生成信号量
// 传统 OC 应用 KVO 技术

// RAC RACObserve 观察者(对象，属性)
// RACSignal * signal = RACObserve(self, title);
//
// [signal subscribeNext:^(id x) {
//
//
// }];

// 常见的应用形式, 进行绑定，将咱们一个已知的属性绑定到另外一个对象的属性上
// RAC() = RACObserve(<#TARGET#>, <#KEYPATH#>)

[[[[[self authorizedSignal] filter:^BOOL(id value) {
```
return [value boolValue];
```
}] flattenMap:^RACStream *(id value){
```
return [[[[[[self rac_signalForSelector:@selector(locationManager:didUpdateLocations:) fromProtocol:@protocol(CLLocationManagerDelegate)] map:^id(id value) {return value[1];
}] merge:[[self rac_signalForSelector:@selector(locationManager:didFailWithError:) fromProtocol:@protocol(CLLocationManagerDelegate)]map:^id(id value) {return [RACSignal error:value[1]];
}]] take:1] initially:^{[self.manager startUpdatingLocation];
}] finally:^{[self.manager stopUpdatingLocation];
}];
```
}] flattenMap:^RACStream *(id value) {
```
CLLocation * location =[value firstObject];
return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {[self.geocoder reverseGeocodeLocation:location completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {if (error) {[subscriber sendError:error];
        }else{[subscriber sendNext:[placemarks firstObject]];
            [subscriber sendCompleted];
        }
    }];
    return [RACDisposable disposableWithBlock:^{
```

        }];
    }];
}] subscribeNext:^(id x) {NSLog(@"%@",x);
    self.placeLabel.text =[x addressDictionary][@"Name"];
    NSLog(@"地址 %@",self.placeLabel.text);
}];