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);}];

}`