ReactiveCocoa - 简单实用场景

发布时间：2020-12-15 03:33:31 所属栏目：百科来源：网络整理

导读：Target-Action示例代码如下： UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(20,20,50,50)]; btn.backgroundColor = [UIColor redColor]; btn.rac_command = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) { NSLog(@"按钮

Target-Action示例代码如下：

    UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(20,20,50,50)];
    btn.backgroundColor = [UIColor redColor];
    btn.rac_command = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {
        NSLog(@"按钮被点击！！");
        return [RACSignal empty];
    }];

输出： 2016-05-10 14:51:36.866 testARC[9948:3012689] 按钮被点击！！

KVO

[RACObserve(self,username) subscribeNext:^(NSString *newName) {
  NSLog(@"%@",newName);
}];

Notification示例代码如下

[[[NSNotificationCenter defaultCenter] rac_addObserverForName:UITextFieldTextDidBeginEditingNotification object:self.emailTextField] subscribeNext:^(id x) {
    [self.emailImageView animate];
    self.emailImageView.image = [UIImage imageNamed:@"icon-mail-active"];
    self.emailTextField.background = [UIImage imageNamed:@"input-outline-active"];
}];

[[[NSNotificationCenter defaultCenter] rac_addObserverForName:UITextFieldTextDidEndEditingNotification object:self.emailTextField] subscribeNext:^(id x) {
    self.emailTextField.background = [UIImage imageNamed:@"input-outline"];
    self.emailImageView.image = [UIImage imageNamed:@"icon-mail"];
}];

（编辑：李大同）

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