@interface idiom_ViewController ()<UITextFieldDelegate>

{

    UITextField * _selectTf;

    NSArray *UIButton_array;

}

@property (weak, nonatomic) IBOutlet UITextField *first_idiom;

@property (weak, nonatomic) IBOutlet UITextField *second_idiom;

@property (weak, nonatomic) IBOutlet UITextField *third_idiom;

- (void)viewDidLoad {

    [super viewDidLoad];

    //实现UITextFieldDelegate的协议

    _first_idiom.delegate=self;

    _second_idiom.delegate =self;

    _third_idiom.delegate =self;

    //点击编辑框隐藏软键盘

    _first_idiom.inputView =[UIView new];

    _second_idiom.inputView =[UIView new];

    _third_idiom.inputView =[UIView new];

    //创建手势识别对象并监听手势

    UITapGestureRecognizer * tap =[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapAction)];

    [self.view addGestureRecognizer:tap];

    // Do any additional setup after loading the view from its nib.

}

//失去焦点

-(void)tapAction{

    [self.view endEditing:YES];

}

-(void)textFieldDidEndEditing:(UITextField *)textField{

    _isBeginTf =NO;

}

-(void)textFieldDidBeginEditing:(UITextField *)textField

{

    _isBeginTf =YES;

    _selectTf =textField;

}

- (void)button_word:(UIButton *)btn

{

    if (!_isBeginTf) {

        return;

    }

    _selectTf.text = [NSString stringWithFormat:@"%@%@",_selectTf.text,btn.titleLabel.text];

    btn.userInteractionEnabled =NO;

    btn.backgroundColor =[UIColor lightGrayColor];

}

- (IBAction)goBackButtonAction:(id)sender {

    if (!_isBeginTf) {

        return;

    }

    if ([_selectTf.text isEqualToString:@""]) {

        return;

    }

    //获取编辑框最后一个文字

    NSString *gaBackStr =[_selectTf.text substringWithRange:NSMakeRange(_selectTf.text.length-, )];

    //获取编辑框length -1的文字

    _selectTf.text =[_selectTf.text substringToIndex:_selectTf.text.length -];

    for (int i=; i<; i++) {

         UIButton *btn= UIButton_array[i];

        //判断删除的文字和按钮中的文字是否相同

        if ([btn.titleLabel.text isEqualToString:gaBackStr]) {

            //相同，按钮从不可点击变为可点击，颜色改变

            btn.userInteractionEnabled =YES;

            btn.backgroundColor =[UIColor orangeColor];

            return;

        }

    }

}