上篇文章: 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。
网络请求
贴上核心代码，具体代码见;
//// 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#import #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 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复制代码
- (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];}复制代码 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];复制代码 通知
- 发送通知
NSMutableArray *dataArray = [[NSMutableArray alloc] initWithObjects:@"1", @"2", @"3", nil];[[NSNotificationCenter defaultCenter] postNotificationName:@"notiName" object:dataArray];复制代码
- 接收通知
[[[NSNotificationCenter defaultCenter] rac_addObserverForName:@"notiName" object:nil] subscribeNext:^(NSNotification *notification) { NSLog(@"%@", notification.name); NSLog(@"%@", notification.object);}];复制代码 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); }];复制代码 ####Target-Action
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UIButton
[[self.button rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(id x) { NSLog(@"x:%@", x); }];复制代码 -
UITextField
[self.tf.rac_textSignal subscribeNext:^(id x) { NSLog(@"x:%@", x); self.label.text = x; }];复制代码 [[self.tf.rac_textSignal map:^id(id value) { return [UIColor redColor]; }] subscribeNext:^(id x) {// NSLog(@"x:%@", x); }];复制代码 -
UIView
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]init]; [tap.rac_gestureSignal subscribeNext:^(id x) { NSLog(@"x:%@", x); self.redView.backgroundColor = [UIColor yellowColor]; }]; [self.redView addGestureRecognizer: tap];复制代码 详情见.