由于最近看到現(xiàn)在的招聘簡(jiǎn)歷一言不合就來一波熟悉ReactiveCocoa函數(shù)鏈?zhǔn)骄幊?，為了緊跟時(shí)代，于是作為菜鳥的我也來研究一波rac, 何為ReactiveCocoa(以下簡(jiǎn)稱rac)? rac 由GitHub開源的一個(gè)應(yīng)用于iOS和OS X開發(fā)的新框架(由19個(gè)大牛編寫而來)。rac具有函數(shù)式編程和響應(yīng)式編程的特性, 作為ios程序員，為何要使用rac呢? 請(qǐng)看下圖:
RAC.png
沒看懂？or不想看？好吧，作為只會(huì)Ctr C +V的我來說，敲代碼就是一把梭，我可以說學(xué)習(xí)rac就是為了裝一波X么？會(huì)不會(huì)被那打死？？??
言歸正傳，當(dāng)pod下來rac的代碼下來試一波，你就會(huì)發(fā)現(xiàn)，rac用著巨爽，主要是為ios程序員省掉了很多代碼量，可以讓代碼更加優(yōu)雅，比如在OC里面的的常見事件處理，在rac里面的代碼量就很少了,請(qǐng)看下圖：
rac->structure.png
rac->UI.png
從上圖我們可以看到rac對(duì)UI控件、代理、等等做了支持，具體的不多說，看下面的代碼：
//taget-Action
[[self.touch rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(id x) {
NSLog(@"x = %@",x);
_alertView = [[UIAlertView alloc] initWithTitle:@"xxx" message:@"xxx" delegate:self cancelButtonTitle:@"cancel" otherButtonTitles:@"other", nil];
[_alertView show];
/*
//對(duì)delegate的支持
[[self rac_signalForSelector:@selector(alertView:clickedButtonAtIndex:) fromProtocol:@protocol(UIAlertViewDelegate)] subscribeNext:^(RACTuple *tupe) {
NSLog(@"first = %@",tupe.first);
NSLog(@"second = %@",tupe.second);
}];
*/
@weakify(self);
[[_alertView rac_buttonClickedSignal] subscribeNext:^(id x) {
@strongify(self);
//rac里面是使用weakify和stringify來避免循環(huán)引用
NSLog(@"x = %@",x);
NSInteger index = [x integerValue];
NSLog(@"你點(diǎn)擊的是第%zd個(gè)按鈕",index);
if (index == 1) {
NextVC *next = [NextVC new];
next.delegate = self;
[self.navigationController pushViewController:next animated:YES];
///rac對(duì)代理支持，但是這里值得注意的是，rac的代理目前只能支持返回值是void的代理，帶有返回值的代理是不支持的
[[self rac_signalForSelector:@selector(nextVC:value:) fromProtocol:@protocol(NextVCDelegate)] subscribeNext:^(RACTuple * tupe) {
NSLog(@"value = %@",tupe);
}];
}
}];
//dismiss
[[_alertView rac_willDismissSignal] subscribeNext:^(id x) {
NSLog(@"alertView will dismiss \n x = %@",x);
}];
}];
//通知
[[[NSNotificationCenter defaultCenter] rac_addObserverForName:UIApplicationDidEnterBackgroundNotification object:nil] subscribeNext:^(NSNotification *noti) {
NSLog(@"notification = %@",noti.name);
}];
//KVO
[RACObserve(self.touch, frame) subscribeNext:^(id x) {
// NSLog(@"frame = %@",[x CGRectValue]);
}];
self.view.userInteractionEnabled = YES;
//對(duì)tap的監(jiān)聽
UITapGestureRecognizer *tap = [UITapGestureRecognizer new];
[[tap rac_gestureSignal] subscribeNext:^(id x) {
NSLog(@"tapview = %@",((UITapGestureRecognizer *)x).view);
}];
[self.view addGestureRecognizer:tap];
//信號(hào)量
RACSignal *signal = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
//發(fā)送next信號(hào)
[subscriber sendNext:@"Chan"];
//發(fā)送完成
[subscriber sendCompleted];
//釋放操作
return [RACDisposable disposableWithBlock:^{
}];
}];
//訂閱
[signal subscribeNext:^(id x) {
NSLog(@"x = %@",x);
}];
//訂閱錯(cuò)誤
[signal doError:^(NSError *error) {
NSLog(@"subcribe error = %@",error.localizedDescription);
}];
//訂閱完成
[signal doCompleted:^{
}];
_pickerController = [UIImagePickerController new];
_pickerController.delegate = self;
_pickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
_pickerController.allowsEditing = NO;
}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
self.touch.frame = CGRectMake(100, 100, 120, 50);
[self presentViewController:_pickerController animated:YES completion:nil];
[[self rac_signalForSelector:@selector(imagePickerController:didFinishPickingMediaWithInfo:) fromProtocol:@protocol(UIImagePickerControllerDelegate)] subscribeNext:^(RACTuple *tupe) {
// tupe里面存著delegate里面的參數(shù)
NSLog(@"first = %@\n second = %@",tupe.first,tupe.second);
}];
}
