ReactiveCocoa
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很早就开始关注ReactiveCocoa了，前段时间决定把它加入到项目中，理由如下
从开始了解 @weakify(self);
[[self.nextButton rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(id x) {
@strongify(self);
[self performSegueWithIdentifier:@"Captcha" sender:nil];
}];
这样单一的信号传递和部署，没有和其他信号有任何的联系，总感觉和 先说说很常用的验证码倒计时功能，用RAC来实现几乎一气呵成 @weakify(self);
RACSignal *timeSignal = [[[[[RACSignal interval:1.0f onScheduler:[RACScheduler mainThreadScheduler]] take:numberLimit] startWith:@(1)] map:^id(NSDate *date) {
@strongify(self);
if (number == 0) {
[self.timeButton setTitle:@"重新发送" forState:UIControlStateNormal];
return @YES;
}
else{
self.timeButton.titleLabel.text = [NSString stringWithFormat:@"%d",number--];
return @NO;
}
}] takeUntil:self.rac_willDeallocSignal];
self.timeButton.rac_command = [[RACCommand alloc]initWithEnabled:timeSignal signalBlock:^RACSignal *(id input) {
number = numberLimit;
return timeSignal;
}];
如果RAC利用得当，几乎可以抛弃写自定义的委托协议。想象一下：当aVC 其中的关键方法是 [[self rac_signalForSelector:@selector(dismiss:)] subscribeNext:^(id x) {
NSLog(@"%s",__func__);
}];
- (IBAction)dismiss:(id)sender{
[self dismissViewControllerAnimated:YES completion:NULL];
}
当 信号什么时候部署可以由我们来决定，既然需要在aVC中处理一些事，那么就应该想办法在aVC中来部署信号。这时候就需要把信号作为bVC的属性
#import <UIKit/UIKit.h> @interface RACDelegateViewController : UIViewController @property (nonatomic,strong) RACSignal *delegateSignal; @end 部署信号
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if ([segue.destinationViewController isKindOfClass:[UINavigationController class]]) {
UINavigationController *nav = (UINavigationController *)segue.destinationViewController;
RACDelegateViewController *delegateVC = (RACDelegateViewController *)nav.topViewController;
[delegateVC.delegateSignal subscribeNext:^(id x) {
NSLog(@"%@",x);
}];
}
}
还有最后一步，生成
- (void)awakeFromNib{
[super awakeFromNib];
self.delegateSignal = [self rac_signalForSelector:@selector(dismiss:)];
}
注意：千万不要在 还不够完美对不对，aVC中接收的数据一直都是UIBarButtonItem对象，想把bVC中的数据传递到aVC中应该如何实现。还必须在信号上做一些调整，利用 - (void)awakeFromNib{
[super awakeFromNib];
@weakify(self);
self.delegateSignal = [[self rac_signalForSelector:@selector(dismiss:)] then:^RACSignal *{
@strongify(self);
return [RACSignal return:self.array];
}];
}
当 - (void)awakeFromNib{
[super awakeFromNib];
@weakify(self);
self.delegateSignal = [[self rac_signalForSelector:@selector(dismiss:)] map:^id(id value) {
@strongify(self);
return self.array;
}];
}
对于需要监听协议方法的时候可以使用 前段时间看了
- (id)initWithCellIdentifier:(NSString *)aCellIdentifier
configureCellBlock:(CellConfigureBlock)aConfigureCellBlock{
self = [super init];
if (self) {
_cellIdentifier = aCellIdentifier;
_configureCellBlock = [aConfigureCellBlock copy];
_signal = RACObserve(self,dataSource);
}
return self;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:_cellIdentifier
forIndexPath:indexPath];
if (self.configureCellBlock) {
@weakify(self);
self.configureCellBlock(cell,[self.signal map:^id(NSArray *array) {
@strongify(self);
return [self itemAtIndexPath:indexPath];
}]);
}
return cell;
}
self.model = [[DataSourceGeneralModel alloc] initWithCellIdentifier:CelIdentifier
configureCellBlock:^(TableViewCell *cell,RACSignal *signal) {
[cell configureCellWithSignal:signal];
}];
- (void)configureCellWithSignal:(RACSignal *)signal{
@weakify(self);
[signal subscribeNext:^(Model *model) {
@strongify(self);
self.titleLabel.text = model.title;
self.detailLabel.text = model.detail;
}];
}
如果更新数据源数组，UITableView也会得到相应的更新，不用调用 self.model.dataSource = @[model1]; 以上例子可以在github下载 待续..........RAC相关博客
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