+ (NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)interval repeats:(BOOL)repeats Block:(void (^)(NSTimer *timer))Block API_AVAILABLE(macosx(10.12), ios(10.0), watchos(3.0), tvos(10.0));

+ (NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)ti target:(id)aTarget selector:(SEL)aSelector userInfo:(nullable id)userInfo repeats:(BOOL)yesOrNo;

+ (instancetype)actionWithTitle:(nullable NSString *)title style:(UIAlertActionStyle)style handler:(void (^ __nullable)(UIAlertAction *action))handler;

    UITableView *tableView = [[UITableView alloc] initWithFrame:self.view.bounds];
    [tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:reuseId];
    [self.view addSubview:tableView];

    NSArray *titles = @[@"北京", @"上海", @"深圳", @"广州", @"成都", @"雄安", @"苏州"];
    
    tableView.numberOfRowsHandler = ^NSInteger(UITableView *__weak  _Nonnull tableView, NSInteger section) {
        return titles.count;
    };
    
    tableView.cellForRowHandler = ^UITableViewCell * _Nonnull(UITableView *__weak  _Nonnull tableView, NSIndexPath * _Nonnull indexPath) {
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reuseId forIndexPath:indexPath];
        cell.textLabel.text = titles[indexPath.row];
        return cell;
    };
    
    tableView.didSelectRowHandler = ^(UITableView *__weak  _Nonnull tableView, NSIndexPath * _Nonnull indexPath) {
        NSString *title = titles[indexPath.row];
        NSLog(title);
    };

    UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(20, 100, self.view.frame.size.width - 40, 30)];
    textField.borderStyle = UITextBorderStyleRoundedRect;
    textField.clearButtonMode = UITextFieldViewModeAlways;
    [self.view addSubview:textField];

    textField.shouldChangeCharactersHandler = ^BOOL(UITextField *__weak  _Nonnull textField, NSRange range, NSString * _Nonnull replacementString) {
        NSString *str = [textField.text stringByReplacingCharactersInRange:range withString:replacementString];
        if (str.length > 6) {
            return NO;
        }
        return YES;
    };

    textField.shouldReturnHandler = ^BOOL(UITextField *__weak  _Nonnull textField) {
        [textField resignFirstResponder];
        return YES;
    };

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
    [btn setFrame:CGRectMake(24, 200, self.view.frame.size.width - 48, 20)];
    [btn setTitle:@"OK" forState:UIControlStateNormal];
    btn.clickHandler = ^{
        NSLog(@"OK");
    };
    [self.view addSubview:btn];

typedef BOOL(^HWShouldBeginEditingBlock)(UITextField *__weak textField);
@property (nonatomic, copy) HWShouldBeginEditingBlock shouldBeginEditingHandler;

- (void)setShouldBeginEditingHandler:(HWShouldBeginEditingBlock)shouldBeginEditingHandler {
    NSAssert(shouldBeginEditingHandler, @"shouldBeginEditingHandler cannot be nil");
    [self configDelegate];
    objc_setAssociatedObject(self, HWBlocksUIShouldBeginEditingKey, shouldBeginEditingHandler, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (HWShouldBeginEditingBlock)shouldBeginEditingHandler {
    return objc_getAssociatedObject(self, &HWBlocksUIShouldBeginEditingKey);
}

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    if (textField.shouldBeginEditingHandler) {
        return textField.shouldBeginEditingHandler(textField);
    }
    return YES;
}

- (void)configDelegate {
    HWBlocksUIProxy *Delegate = [HWBlocksUIProxy sharedInstance];
    if (self.Delegate != Delegate) {
        self.Delegate = Delegate;
    }
}

typedef BOOL(^HWShouldChangeCharactersBlock)(UITextField *__weak textField, NSRange range, NSString *replacementString);