RAC
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
/*******************************第一部分----簡單使用*******************************/
//文本框事件：
[self textFiledTest];
//手勢
[self gestureTest];
//通知
[self notificationTest];
//定時器NSTime
[self timeTest];
//代理 (有局限，只能取代沒有返回值的代理方法)
[self delegateTest];
//KVO
[self kvoTest];
/*******************************第二部分----進階*******************************/
//雙向綁定
[self banding];
//信號 （創建信號 & 激活信號 & 廢棄信號）
[self createSignal];
//信號的處理
//map (映射)和filter
[self mapAndFilter];
//delay延遲
[self delay];
//最先開始的時候
[self startWith];
//超時
[self timeOut];
//take skip
[self takeOrSkip];
//throttle(截流) 結合即時搜索優化來講
[self throttle];
//repeat 重復
[self repeatTest];
//merge 合并信號
[self mergeTest];
//RAC(TARGET, ...) 宏
[self RAC];
//rac做一個秒表
[self stopwatch];
//壓縮同合并 ab: ab=>
[self zipWith];
//活合并 ab: a=> b=>
[self merge];
//過濾合并 ab: b=>
[self then];
//順序合并 ab: a->b=>
[self concat];
}
#pragma mark 0.雙向綁定
- (void)banding{
RACChannelTerminal *channelA = RACChannelTo(self, valueA);
RACChannelTerminal *channelB = RACChannelTo(self, valueB);
[[channelA map:^id(NSString *value) {
if ([value isEqualToString:@"西"]) {
return @"東";
}
return value;
}] subscribe:channelB];
[[channelB map:^id(NSString *value) {
if ([value isEqualToString:@"左"]) {
return @"右";
}
return value;
}] subscribe:channelA];
[RACObserve(self, valueA) subscribeNext:^(NSString* x) {
NSLog(@"你向%@", x);
}];
[RACObserve(self, valueB) subscribeNext:^(NSString* x) {
NSLog(@"他向%@", x);
}];
self.valueA = @"西";
self.valueB = @"左";
}
#pragma mark 1.文本框事件
- (void)textFiledTest{
UITextField * textField = ({
UITextField * textField = [[UITextField alloc]init];
textField.backgroundColor = [UIColor cyanColor];
textField;
});
[self.view addSubview:textField];
@weakify(self); // __weak __typeof__(self) self_weak_ = self;
[textField mas_makeConstraints:^(MASConstraintMaker *make) {
@strongify(self); // __strong __typeof__(self) self = self_weak_;
make.size.mas_equalTo(CGSizeMake(180, 40));
make.center.equalTo(self.view);
}];
[[textField rac_signalForControlEvents:UIControlEventEditingChanged]
subscribeNext:^(id x) {
LxDBAnyVar(x);
}];
//更簡單的方式
[textField.rac_textSignal subscribeNext:^(NSString *x) {
LxDBAnyVar(x);
}];
}
#pragma mark 2.手勢
- (void)gestureTest
{
self.view.userInteractionEnabled = YES;
UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc]init];
[[tap rac_gestureSignal] subscribeNext:^(UITapGestureRecognizer * tap) {
LxDBAnyVar(tap);
}];
[self.view addGestureRecognizer:tap];
}
#pragma mark 3.通知
- (void)notificationTest
{
[[[NSNotificationCenter defaultCenter] rac_addObserverForName:UIApplicationDidEnterBackgroundNotification object:nil] subscribeNext:^(NSNotification * notification) {
LxDBAnyVar(notification);
}];
//不需要removeObserver
}
#pragma mark 4.定時器
- (void)timeTest
{
//1. 延遲某個時間后再做某件事
[[RACScheduler mainThreadScheduler]afterDelay:2 schedule:^{
LxPrintAnything(rac);
}];
//2. 每間隔多長時間做一件事
[[RACSignal interval:1 onScheduler:[RACScheduler mainThreadScheduler]]subscribeNext:^(NSDate * date) {
LxDBAnyVar(date);
}];
}
#pragma mark 5.代理
- (void)delegateTest
{
UIAlertView * alertView = [[UIAlertView alloc]initWithTitle:@"RAC" message:@"ReactiveCocoa" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ensure", nil];
[[self rac_signalForSelector:@selector(alertView:clickedButtonAtIndex:) fromProtocol:@protocol(UIAlertViewDelegate)] subscribeNext:^(RACTuple * tuple) {
LxDBAnyVar(tuple);
LxDBAnyVar(tuple.first);
LxDBAnyVar(tuple.second);
LxDBAnyVar(tuple.third);
}];
[alertView show];
// 更簡單的方式：
[[alertView rac_buttonClickedSignal]subscribeNext:^(id x) {
LxDBAnyVar(x);
}];
}
#pragma mark 6.KVO
/**
* KVO
* RACObserveL:快速的監聽某個對象的某個屬性改變
* 返回的是一個信號,對象的某個屬性改變的信號
- (void)test2 {
[RACObserve(self.view, center) subscribeNext:^(id x) {
NSLog(@"%@", x);
}];
}
- (void)testAndtest2 // textField輸入的值賦值給label，監聽label文字改變,
{
RAC(self.label, text) = self.textField.rac_textSignal;
[RACObserve(self.label, text) subscribeNext:^(id x) {
NSLog(@"====label的文字變了");
}];
}
*/
- (void)kvoTest
{
UIScrollView * scrollView = [[UIScrollView alloc]init];
scrollView.delegate = (id<UIScrollViewDelegate>)self;
[self.view addSubview:scrollView];
UIView * scrollViewContentView = [[UIView alloc]init];
scrollViewContentView.backgroundColor = [UIColor yellowColor];
[scrollView addSubview:scrollViewContentView];
@weakify(self);
[scrollView mas_makeConstraints:^(MASConstraintMaker *make) {
@strongify(self);
make.edges.equalTo(self.view).insets(UIEdgeInsetsMake(80, 80, 80, 80));
}];
[scrollViewContentView mas_makeConstraints:^(MASConstraintMaker *make) {
@strongify(self);
make.edges.equalTo(scrollView);
make.size.mas_equalTo(CGSizeMake(CGRectGetWidth(self.view.frame), CGRectGetHeight(self.view.frame)));
}];
[RACObserve(scrollView, contentOffset) subscribeNext:^(id x) {
LxDBAnyVar(x);
}];
// （好處：寫法簡單，keypath有代碼提示）
}
#pragma mark - concat 順序合并
// concat----- 使用需求：有兩部分數據：想讓上部分先執行，完了之后再讓下部分執行（都可獲取值）
- (void)concat {
// 組合
// 創建信號A
RACSignal *signalA = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
// 發送請求
NSLog(@"----發送上部分請求---afn");
[subscriber sendNext:@"上部分數據"];
[subscriber sendCompleted]; // 必須要調用sendCompleted方法！
return nil;
}];
// 創建信號B，
RACSignal *signalsB = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
// 發送請求
NSLog(@"--發送下部分請求--afn");
[subscriber sendNext:@"下部分數據"];
return nil;
}];
// concat:按順序去鏈接
//**-注意-**：concat，第一個信號必須要調用sendCompleted
// 創建組合信號
RACSignal *concatSignal = [signalA concat:signalsB];
// 訂閱組合信號
[concatSignal subscribeNext:^(id x) {
NSLog(@"%@",x);
}];
}
#pragma mark - zipWith 只有當兩個信號同時發出信號內容時
- (void)zipWith {
//zipWith:把兩個信號壓縮成一個信號，只有當兩個信號同時發出信號內容時，并且把兩個信號的內容合并成一個元祖，才會觸發壓縮流的next事件。
// 創建信號A
RACSubject *signalA = [RACSubject subject];
// 創建信號B
RACSubject *signalB = [RACSubject subject];
// 壓縮成一個信號
// **-zipWith-**: 當一個界面多個請求的時候，要等所有請求完成才更新UI
// 等所有信號都發送內容的時候才會調用
RACSignal *zipSignal = [signalA zipWith:signalB];
[zipSignal subscribeNext:^(id x) {
NSLog(@"%@", x); //所有的值都被包裝成了元組
}];
// 發送信號 交互順序，元組內元素的順序不會變，跟發送的順序無關，而是跟壓縮的順序有關[signalA zipWith:signalB]---先是A后是B
[signalA sendNext:@1];
[signalB sendNext:@2];
}
#pragma mark - merge 多個信號合并成一個信號，任何一個信號有新值就會調用
// 任何一個信號請求完成都會被訂閱到
// merge:多個信號合并成一個信號，任何一個信號有新值就會調用
- (void)merge {
// 創建信號A
RACSubject *signalA = [RACSubject subject];
// 創建信號B
RACSubject *signalB = [RACSubject subject];
//組合信號
RACSignal *mergeSignal = [signalA merge:signalB];
// 訂閱信號
[mergeSignal subscribeNext:^(id x) {
NSLog(@"%@", x);
}];
// 發送信號---交換位置則數據結果順序也會交換
[signalB sendNext:@"下部分"];
[signalA sendNext:@"上部分"];
}
#pragma mark - then
// then --- 使用需求：有兩部分數據：想讓上部分先進行網絡請求但是過濾掉數據，然后進行下部分的，拿到下部分數據
- (void)then {
// 創建信號A
RACSignal *signalA = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
// 發送請求
NSLog(@"----發送上部分請求---afn");
[subscriber sendNext:@"上部分數據"];
[subscriber sendCompleted]; // 必須要調用sendCompleted方法！
return nil;
}];
// 創建信號B，
RACSignal *signalsB = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
// 發送請求
NSLog(@"--發送下部分請求--afn");
[subscriber sendNext:@"下部分數據"];
[subscriber sendCompleted];
return nil;
}];
// 創建組合信號
// then;忽略掉第一個信號的所有值
RACSignal *thenSignal = [signalA then:^RACSignal *{
// 返回的信號就是要組合的信號
return signalsB;
}];
// 訂閱信號
[thenSignal subscribeNext:^(id x) {
NSLog(@"%@", x);
}];
}
#pragma mark stopwatch
- (void)stopwatch
{
UILabel * label = ({
UILabel * label = [[UILabel alloc]init];
label.backgroundColor = [UIColor cyanColor];
label;
});
[self.view addSubview:label];
@weakify(self);
[label mas_makeConstraints:^(MASConstraintMaker *make) {
@strongify(self);
make.size.mas_equalTo(CGSizeMake(240, 40));
make.center.equalTo(self.view);
}];
RAC(label, text) = [[RACSignal interval:1 onScheduler:[RACScheduler mainThreadScheduler]] map:^NSString *(NSDate * date) {
return date.description;
}];
}
#pragma mark 8.RAC
- (void)RAC
{
//button setBackgroundColor:forState:
UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];
[self.view addSubview:button];
@weakify(self);
[button mas_makeConstraints:^(MASConstraintMaker *make) {
@strongify(self);
make.size.mas_equalTo(CGSizeMake(180, 40));
make.center.equalTo(self.view);
}];
/**
RAC:把一個對象的某個屬性綁定一個信號,只要發出信號,就會把信號的內容給對象的屬性賦值
給label的text屬性綁定了文本框改變的信號
RAC(self.label, text) = self.textField.rac_textSignal;
[self.textField.rac_textSignal subscribeNext:^(id x) {
self.label.text = x;
}];
*/
RAC(button, backgroundColor) = [RACObserve(button, selected) map:^UIColor *(NSNumber * selected) {
return [selected boolValue] ? [UIColor redColor] : [UIColor greenColor];
}];
//rac_valuesForKeyPath:
[[button rac_signalForControlEvents:UIControlEventTouchUpInside]subscribeNext:^(UIButton * btn) {
btn.selected = !btn.selected;
}];
//tableView Cell
// [[[button rac_signalForControlEvents:UIControlEventTouchUpInside] takeUntil:self.rac_prepareForReuseSignal] subscribeNext:^(UIButton *x) {
// do other things
// }];
}
#pragma mark - 9.RACSignal
/**
RACSignal使用步驟：
1.創建信號 + (RACSignal *)createSignal:(RACDisposable * (^)(id<RACSubscriber> subscriber))didSubscribe
2.訂閱信號,才會激活信號. - (RACDisposable *)subscribeNext:(void (^)(id x))nextBlock
3.發送信號 - (void)sendNext:(id)value
RACSignal底層實現：
1.創建信號，首先把didSubscribe保存到信號中，還不會觸發。
2.當信號被訂閱，也就是調用signal的subscribeNext:nextBlock
2.2 subscribeNext內部會創建訂閱者subscriber，并且把nextBlock保存到subscriber中。
2.1 subscribeNext內部會調用siganl的didSubscribe
3.siganl的didSubscribe中調用[subscriber sendNext:@1];
3.1 sendNext底層其實就是執行subscriber的nextBlock
* 總結：
我們完全可以用RACSubject代替代理/通知，確實方便許多
這里我們點擊TwoViewController的pop的時候將字符串"ws"傳給了ViewController的button的title。
步驟：
// 1.創建信號
RACSubject *subject = [RACSubject subject];
// 2.訂閱信號
[subject subscribeNext:^(id x) {
// block:當有數據發出的時候就會調用
// block:處理數據
NSLog(@"%@",x);
}];
// 3.發送信號
[subject sendNext:value];
**注意：~~**
RACSubject和RACReplaySubject的區別
RACSubject必須要先訂閱信號之后才能發送信號，而RACReplaySubject可以先發送信號后訂閱.
RACSubject 代碼中體現為：先走TwoViewController的sendNext，后走ViewController的subscribeNext訂閱
RACReplaySubject 代碼中體現為：先走ViewController的subscribeNext訂閱，后走TwoViewController的sendNext
可按實際情況各取所需。
*/
#pragma mark repeat
- (void)repeatTest
{
//repeat:
[[[[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
[subscriber sendNext:@"rac"];
[subscriber sendCompleted];
return nil;
}]delay:1]repeat]take:3] subscribeNext:^(id x) {
LxDBAnyVar(x);
} completed:^{
LxPrintAnything(completed);
}];
}
#pragma mark throttle
- (void)throttle
{
UITextField * textField = [[UITextField alloc]init];
textField.backgroundColor = [UIColor cyanColor];
[self.view addSubview:textField];
@weakify(self);
[textField mas_makeConstraints:^(MASConstraintMaker *make) {
@strongify(self);
make.size.mas_equalTo(CGSizeMake(180, 40));
make.center.equalTo(self.view);
}];
//throttle 后面是個時間 表示rac_textSignal發送消息，0.3秒內沒有再次發送就會相應，若是0.3內又發送消息了，便會在新的信息處重新計時
//distinctUntilChanged 表示兩個消息相同的時候，只會發送一個請求
//ignore 表示如果消息和ignore后面的消息相同，則會忽略掉這條消息，不讓其發送
[[[[[[textField.rac_textSignal throttle:0.3] distinctUntilChanged] ignore:@""] map:^id(id value) {
return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
// network request
[subscriber sendNext:value];
[subscriber sendCompleted];
return [RACDisposable disposableWithBlock:^{
// cancel request
}];
}];
}]switchToLatest] subscribeNext:^(id x) {
LxDBAnyVar(x);
}];
}
#pragma mark takeOrSkip
- (void)takeOrSkip
{
RACSignal * signal = [[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
[subscriber sendNext:@"rac1"];
[subscriber sendNext:@"rac2"];
[subscriber sendNext:@"rac3"];
[subscriber sendNext:@"rac4"];
[subscriber sendCompleted];
return nil;
}]take:2];//Skip takeLast takeUntil takeWhileBlock: skipWhileBlock: skipUntilBlock:
[signal subscribeNext:^(id x) {
LxDBAnyVar(x);
}];
}
#pragma mark timeOut
- (void)timeOut
{
[[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
[[RACScheduler mainThreadScheduler]afterDelay:3 schedule:^{
[subscriber sendNext:@"rac"];
[subscriber sendCompleted];
}];
return nil;
}] timeout:2 onScheduler:[RACScheduler mainThreadScheduler]]
subscribeNext:^(id x) {
LxDBAnyVar(x);
} error:^(NSError *error) {
LxDBAnyVar(error);
} completed:^{
LxPrintAnything(completed);
}];
}
#pragma mark startWith
- (void)startWith
{
RACSignal * signal = [[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
[subscriber sendNext:@"123"];//startWith:@"123"等同于這句話 也就是第一個發送，主要是位置
[subscriber sendNext:@"rac"];
[subscriber sendCompleted];
return nil;
}]startWith:@"123"];
LxPrintAnything(start);
//創建訂閱者
[signal subscribeNext:^(id x) {
LxDBAnyVar(x);
}];
}
#pragma mark delay
- (void)delay
{
//創建信號
RACSignal * signal = [[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
[subscriber sendNext:@"rac"];
[subscriber sendCompleted];
return nil;
}]delay:2];
LxPrintAnything(start);
//創建訂閱者
[signal subscribeNext:^(id x) {
LxDBAnyVar(x);
}];
}
#pragma mark map (映射)和filter
- (void)mapAndFilter
{
UITextField * textField = ({
UITextField * textField = [[UITextField alloc]init];
textField.backgroundColor = [UIColor cyanColor];
textField;
});
[self.view addSubview:textField];
@weakify(self); // __weak __typeof__(self) self_weak_ = self;
[textField mas_makeConstraints:^(MASConstraintMaker *make) {
@strongify(self); // __strong __typeof__(self) self = self_weak_;
make.size.mas_equalTo(CGSizeMake(180, 40));
make.center.equalTo(self.view);
}];
[[[textField.rac_textSignal map:^id(NSString *text) {
LxDBAnyVar(text);
return @(text.length);
}]filter:^BOOL(NSNumber *value) {
return value.integerValue > 3;
}] subscribeNext:^(id x) {
LxDBAnyVar(x);
}];
}
#pragma mark Signal
- (RACSignal *)createSignal
{
return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
RACDisposable * schedulerDisposable = [[RACScheduler mainThreadScheduler]afterDelay:2 schedule:^{
if (arc4random()%10 > 1) {
[subscriber sendNext:@"Login response"];
[subscriber sendCompleted];
}
else {
[subscriber sendError:[NSError errorWithDomain:@"LOGIN_ERROR_DOMAIN" code:444 userInfo:@{}]];
}
}];
return [RACDisposable disposableWithBlock:^{
[schedulerDisposable dispose];
}];
}];
}
#pragma mark 縮鍵盤
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
[self.view endEditing:YES];
}
@end
常見報錯
1.升級XCode7.3 后RAC報錯“Cannot create __weak reference in file using manual reference counting”解決辦法(http://blog.csdn.net/ouq68/article/details/51003876)
Please set ‘Weak References in Manual Retain Release:YES’.
2.[!] The Paopao [Debug] target overrides the PODS_ROOT build setting defined in `....
我想要使用 CocoaPods 中的設置，分別在我的項目中定義PODS_ROOT
和 Other Linker Flags 的地方，把他們的值用$(inherited) 替換掉，進入終端，執行
Demo 地址:RACDemo-master
