RAC(ReactiveCocoa)使用方法(一)
RAC(ReactiveCocoa)使用方法(二)
上篇文章:RAC(ReactiveCocoa)使用方法(一)
中主要介绍了一些RAC中常见类的用法，这篇文章主要总结日常开发中结合一些UI控件的用法。
RAC给常见的很多UI类拓展了用法，使得开发变得越来越简单，减少了很多不必要的代理和Target代码，RAC内部已经处理好了这些事件。
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网络请求
贴上核心代码，具体代码见Github;
//
// ViewModel.m
//
//
// Created by soliloquy on 2017/11/28.
////豆瓣电影API
#define url @"https://api.douban.com/v2/movie/in_theaters?apikey=0b2bdeda43b5688921839c8ecb20399b&city=%E5%8C%97%E4%BA%AC&start=0&count=100&client=&udid="#import "ViewModel.h"
#import <AFNetworking/AFNetworking.h>
#import <MJExtension/MJExtension.h>
#import "Model.h"@implementation ViewModel
- (instancetype)init
{self = [super init];if (self) {__weak typeof (self)weakSelf = self;self.command = [[RACCommand alloc]initWithSignalBlock:^RACSignal *(id input) {return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {[weakSelf fetchData:^(NSArray *arr) {[subscriber sendNext:arr];[subscriber sendCompleted];} failure:^(NSError *error) {[subscriber sendError:error];}];return nil;}];}];}return self;
}- (void)fetchData:(void(^)(NSArray *arr))successBlock failure:(void(^)(NSError *error))failure{AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];manager.requestSerializer = [AFJSONRequestSerializer serializer];manager.responseSerializer = [AFJSONResponseSerializer serializer];[manager GET:url parameters:nil progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {NSArray *arr = [Model mj_objectArrayWithKeyValuesArray:responseObject[@"subjects"]];/** 方法一：block回调出去if (self.dataSourceBlock) {self.dataSourceBlock(arr);}*//**方法二 ： ReactiveCocoa*/if (successBlock) {successBlock(arr);}} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {if (failure) {failure(error);}}];
}@end
- (void)viewDidLoad {[super viewDidLoad];[self bindViewModel];
}- (void)bindViewModel {/** RAC */@weakify(self)[self.viewModel.command.executionSignals.switchToLatest subscribeNext:^(NSArray *dataSource) {@strongify(self);self.dataSource = dataSource;NSLog(@"%@",dataSource);}];// 返回错误[self.viewModel.command.errors subscribeNext:^(NSError *_Nullable x) {NSLog(@"-- error : %@", x.description);}];//执行command[self.viewModel.command execute:nil];
}代理
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"标题" message:@"123456" delegate:self cancelButtonTitle:@"cancel" otherButtonTitles:@"other", nil];
[[self rac_signalForSelector:@selector(alertView:clickedButtonAtIndex:) fromProtocol:@protocol(UIAlertViewDelegate)] subscribeNext:^(RACTuple *tuple) {NSLog(@"%@",tuple.first);NSLog(@"%@",tuple.second);NSLog(@"%@",tuple.third);
}];
[alertView show];通知
- 发送通知
NSMutableArray *dataArray = [[NSMutableArray alloc] initWithObjects:@"1", @"2", @"3", nil];
[[NSNotificationCenter defaultCenter] postNotificationName:@"notiName" object:dataArray];- 接收通知
[[[NSNotificationCenter defaultCenter] rac_addObserverForName:@"notiName" object:nil] subscribeNext:^(NSNotification *notification) {NSLog(@"%@", notification.name);NSLog(@"%@", notification.object);
}];KVO
UIScrollView *scrolView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];scrolView.contentSize = CGSizeMake(200, 800);scrolView.backgroundColor = [UIColor redColor];[self.view addSubview:scrolView];[RACObserve(scrolView, contentOffset) subscribeNext:^(id x) {NSLog(@"contentOffset: %@",x);}];Target-Action
UIButton
[[self.button rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(id x) {NSLog(@"x:%@", x);}];UITextField
[self.tf.rac_textSignal subscribeNext:^(id x) {NSLog(@"x:%@", x);self.label.text = x;}];[[self.tf.rac_textSignal map:^id(id value) {return [UIColor redColor];}] subscribeNext:^(id x) {
// NSLog(@"x:%@", x);}];UIView
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]init];[tap.rac_gestureSignal subscribeNext:^(id x) {NSLog(@"x:%@", x);self.redView.backgroundColor = [UIColor yellowColor];}];[self.redView addGestureRecognizer: tap];详情见github.
