1.給按鈕綁定方法
[[self.button rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(id x) {
NSLog(@"%@",x);
}];
2.添加代理方法
UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"RAC" message:@"RAC TEST" delegate:self cancelButtonTitle:@"CANCEL" otherButtonTitles:@"other", @"1111",@"2222",nil];
[[self rac_signalForSelector:@selector(alertView:clickedButtonAtIndex:)fromProtocol:@protocol(UIAlertViewDelegate)]subscribeNext:^(RACTuple *tuple) {
NSLog(@"tuple%@",tuple);
}];
[[alertView rac_buttonClickedSignal]subscribeNext:^(id x) {
NSLog(@"%@",x);
}];
3.接收通知
[[[NSNotificationCenter defaultCenter] rac_addObserverForName:@"postData" object:nil]subscribeNext:^(NSNotification * notification) {
NSLog(@"%@",notification.name);
NSLog(@"%@",notification.object);
}];
4.KVO
UIScrollView *scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 300, 400, 300)];
scrollView.backgroundColor = [UIColor redColor];
scrollView.contentSize = CGSizeMake(0, 1000);
[self.view addSubview:scrollView];
[RACObserve(scrollView, contentOffset)subscribeNext:^(id x) {
NSLog(@"%@",x);
}];
MAP
映射的意思，就是創建一個訂閱者的映射并且返回數據
我理解為攔截到信號內容,返回想要的內容
[[[self.button rac_signalForControlEvents:UIControlEventTouchUpInside]map:^id(id value) {
NSLog(@"value: %@",value);
return @"aaaa";
}]subscribeNext:^(id x) {
NSLog(@"x:%@",x);
}];
輸出
2017-03-08 09:52:59.566726 RACDemo[6241:2176773] value: <UIButton: 0x1005113d0; frame = (20 154; 374 30); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x174039f40>>
2017-03-08 09:52:59.567147 RACDemo[6241:2176773] x:aaaa
filter 過濾
在 filter 中,如果返回 yes 則發送信號,no 則取消發送,達到過濾的效果
[[self.textField.rac_textSignal filter:^BOOL(id value) {
return [value length] > 3;
}]subscribeNext:^(id x) {
NSLog(@"x:%@",x);
}];
輸出
2017-03-08 10:06:27.552855 RACDemo[6257:2180433] x:1111
2017-03-08 10:06:28.166590 RACDemo[6257:2180433] x:11111
2017-03-08 10:06:28.397429 RACDemo[6257:2180433] x:111111
take
選取前幾個信號進行發送
take 2 選取前兩個信號發送
[[self.button rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(id x) {
[self.textField endEditing:YES];
// [alertView show];
//創建信號
RACSignal *signal = [[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
[subscriber sendNext:@"1"];
[subscriber sendNext:@"2"];
[subscriber sendNext:@"3"];
[subscriber sendNext:@"4"];
[subscriber sendCompleted];
return nil;
}] take:2];
//發送信號
[signal subscribeNext:^(id x) {
NSLog(@"x : %@",x);
} completed:^{
NSLog(@"completed");
}];
}];
輸出
2017-03-08 10:15:11.815895 RACDemo[6274:2184570] x : 1
2017-03-08 10:15:11.816197 RACDemo[6274:2184570] x : 2
2017-03-08 10:15:11.816323 RACDemo[6274:2184570] completed
skip
跳過信號
把上文中 take 替換成 skip
輸出:
2017-03-08 10:18:16.362060 RACDemo[6281:2185871] x : 3
2017-03-08 10:18:16.362506 RACDemo[6281:2185871] x : 4
2017-03-08 10:18:16.362658 RACDemo[6281:2185871] completed
repeat
把 take 2 替換成 repeat
信號會無限制的重復發送
相似的還有takeLast takeUntil takeWhileBlock skipWhileBlock skipUntilBlock repeatWhileBlock都可以根據字面意思來理解。
delay
延遲發送信號
//創建信號
RACSignal *signal = [[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
[subscriber sendNext:@"1"];
[subscriber sendNext:@"2"];
[subscriber sendNext:@"3"];
[subscriber sendNext:@"4"];
[subscriber sendCompleted];
return nil;
}] delay:3]take:3];
//發送信號
[signal subscribeNext:^(id x) {
NSLog(@"x : %@",x);
} completed:^{
NSLog(@"completed");
}];
輸出
2017-03-08 10:24:25.470258 RACDemo[6294:2188587] x : 1
2017-03-08 10:24:25.470626 RACDemo[6294:2188587] x : 2
2017-03-08 10:24:25.470870 RACDemo[6294:2188587] x : 3
2017-03-08 10:24:25.471233 RACDemo[6294:2188587] completed
throttle
加了節流管道，后面跟上了類型為NSTimeInterval的參數后，只有0.5S內信號不產生變化才會發送請求，這樣快速的輸入也不會造成多次輸出。
[[[self.textFild rac_textSignal] throttle:0.5] subscribeNext:^(id x) {
NSLog(@"%@", x);
}];
distinctUntilChanged
網絡請求中為了減輕服務器壓力，無用的請求我們應該盡可能不發送。distinctUntilChanged的作用是使RAC不會連續發送兩次相同的信號，這樣就解決了這個問題。
[[[self.textFild rac_textSignal] distinctUntilChanged] subscribeNext:^(id x) {
NSLog(@"%@", x);
}];
timeout
超時信號，當超出限定時間后會給訂閱者發送error信號
//創建信號 延遲3秒發送,但是信號時限為2秒
RACSignal *signal = [[[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
[subscriber sendNext:@"1"];
[subscriber sendNext:@"2"];
[subscriber sendNext:@"3"];
[subscriber sendNext:@"4"];
[subscriber sendCompleted];
return nil;
}] delay:3]take:3]timeout:2 onScheduler:[RACScheduler mainThreadScheduler]];
//發送信號
[signal subscribeNext:^(id x) {
NSLog(@"x: %@",x);
} error:^(NSError *error) {
NSLog(@"error : %@",error);
}];
輸出
2017-03-08 10:32:32.149072 RACDemo[6302:2191123] error : Error Domain=RACSignalErrorDomain Code=1 "(null)"
ignore
忽略信號，指定一個任意類型的量（可以是字符串，數組等），當需要發送信號時講進行判斷，若相同則該信號會被忽略發送。
//創建信號 take 3 發送三個信號,但是忽略內容為@"1"的信號
RACSignal *signal = [[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
[subscriber sendNext:@"1"];
[subscriber sendNext:@"2"];
[subscriber sendNext:@"3"];
[subscriber sendNext:@"4"];
[subscriber sendCompleted];
return nil;
}]take:3]ignore:@"1"];
//發送信號
[signal subscribeNext:^(id x) {
NSLog(@"x: %@",x);
} completed:^{
NSLog(@"completed");
}];
輸出
2017-03-08 10:38:36.399691 RACDemo[6313:2193199] x: 2
2017-03-08 10:38:36.400032 RACDemo[6313:2193199] x: 3
2017-03-08 10:38:36.400198 RACDemo[6313:2193199] completed
ignore 可以連續使用
//創建信號
RACSignal *signal = [[[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
[subscriber sendNext:@"1"];
[subscriber sendNext:@"2"];
[subscriber sendNext:@"3"];
[subscriber sendNext:@"4"];
[subscriber sendCompleted];
return nil;
}]take:3]ignore:@"1"]ignore:@"2"];
//發送信號
[signal subscribeNext:^(id x) {
NSLog(@"x: %@",x);
} completed:^{
NSLog(@"completed");
}];
輸出
2017-03-08 10:39:07.841313 RACDemo[6316:2193759] x: 3
2017-03-08 10:39:07.841681 RACDemo[6316:2193759] completed
參拷貝:
http://www.lxweimin.com/p/ff79a5ae0353
http://www.lxweimin.com/p/aa155560bfed
