遍历子视图中某个类型控件方法

    NSMutableArray *textFieldArray = [NSMutableArray arrayWithCapacity:5];

    

    for (UIView *textField in self.view.subviews) {

        if ([textField isKindOfClass:[UITextField class]]) {

            [textFieldArray addObject:textField];

        }

    }

用isKindOfClass判断指定类型