ios - UITextField に触れてもファーストレスポンダーにならず、通常のミスは一切適用されません

Question

タップしてもファーストレスポンダにならない UITextField があります。ファーストレスポンダーになるように割り当てることができます。しかし、ファーストレスポンダーのステータスを辞任し、それをタップまたはタブで戻してファーストレスポンダーに戻そうとしても、何も起こりません。タッチがどこかに閉じ込められているように見えますが、それを引き起こしている可能性のあるコードは何も見つかりません。私は通常の容疑者をチェックしました：

1. テキストフィールドがトップビューの場合
2. スーパービューの境界内のテキストフィールドです
3. テキストフィールド userEnabled です。

また、コードをいくつかの異なる方法で書き直しましたが、役に立ちませんでした。

誰でもこの問題を解決できますか。問題の textField はanswerTextField、メソッドでタイトルが付けられたフィールドcreateOneDoubleViewAtOriginです。

関連するコードは以下です。

-(instancetype)initForProblem:(NSString *)problem{
NSLog(@"%@ '%@'",self.class, NSStringFromSelector(_cmd));

self = [super init];

if (self) {

    [self parseBasicFractionProblem:problem];

    if (_problemType == fractDoubleWithPic) {

        NSLog(@"placed the fract views");

        UIView *firstProblemView = [self createOneDoubleViewAtOrigin:CGPointMake(26, 30) withNumerator:_numerator1 denominator:_denominator1 forViewNumber:0];

        UIView *secondProblemView = [self createOneDoubleViewAtOrigin:CGPointMake(342,30) withNumerator:_numerator2 denominator:_denominator2 forViewNumber:1];

        [self addSubview:firstProblemView];
        [self addSubview:secondProblemView];
        [self bringSubviewToFront:firstProblemView];
        [self bringSubviewToFront:secondProblemView]; 

    }
    else if (_problemType == fractDoubleNoPicAns||_problemType == fractDoubleNoPicExtendedAns  ){

    }

}

self.tag = 800;
self.backgroundColor = [UIColor redColor]; 
NSLog(@"made to end"); 
return self; 
}

-(UIView *)createOneDoubleViewAtOrigin:(CGPoint)viewOrigin withNumerator:(NSInteger)numerator denominator:(NSInteger)denominator forViewNumber:(NSInteger)viewNumber{
NSLog(@"%@ '%@'",self.class, NSStringFromSelector(_cmd));

UIView *containerView = [[UIView alloc] initWithFrame: CGRectMake(viewOrigin.x,viewOrigin.y, 310, 263)];
containerView.backgroundColor = [UIColor colorWithRed:178.0/255.0 green:222.0/255.0 blue:80.0/255.0 alpha:1.0];
containerView.layer.cornerRadius = 5.0;

UILabel *numeratorView = [self createSubview:CGRectMake(66, 23, 59, 47) text:[NSString stringWithFormat:@"%ld",(long)numerator] inView:containerView];
UILabel *divisorView = [self createSubview:CGRectMake(66, 40, 59, 47) text:@"___" inView:containerView];
UILabel *denominatorView = [self createSubview:CGRectMake(72, 82, 47, 47) text:[NSString stringWithFormat:@"%ld",(long)denominator] inView:containerView];
UILabel *equals = [self createSubview:CGRectMake(125, 50, 47, 47) text:@"=" inView:containerView];
/*
FFractSupportedTextField *answerField = [self createAnswerField:CGRectMake(173,50,82,47)];
 */

UITextField *answerTextField = [[UITextField alloc] initWithFrame:CGRectMake(173,50,82,47)];

//Inside
answerTextField.font = [UIFont fontWithName:@"Helvetica" size:30.0];
answerTextField.textAlignment = NSTextAlignmentCenter;
answerTextField.placeholder = @"?";

//border
answerTextField.layer.borderWidth = 1;
answerTextField.layer.borderColor = [[UIColor blackColor] CGColor];
answerTextField.layer.cornerRadius = 5.0;

answerTextField.userInteractionEnabled = YES;
[answerTextField addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];


containerView.tag = 820 + 6*viewNumber;
numeratorView.tag = 821 + 6*viewNumber;
divisorView.tag = 822 + 6*viewNumber;
denominatorView.tag = 823 + 6*viewNumber;
equals.tag = 824 + 6*viewNumber;
answerTextField.tag  = 801 + viewNumber;



UIView *pictureView = [self createFractPictureForNumerator:numerator denominator:denominator number:viewNumber];
pictureView.tag = 825 + 6*viewNumber;


if (viewNumber == 0){

    _answerTextField1 = answerTextField;
    [containerView addSubview:_answerTextField1];
    [containerView bringSubviewToFront:_answerTextField1];

    _pictureView1 = pictureView;
    [containerView addSubview:_pictureView1];

    [_answerTextField1 becomeFirstResponder];

} else if (viewNumber == 1) {

    _answerTextField2 = answerTextField;
    [containerView addSubview:_answerTextField2];
    [containerView bringSubviewToFront:_answerTextField2];

    _pictureView2 = pictureView;
    [containerView addSubview:_pictureView2];

}

return containerView;
}


-(UILabel *)createSubview:(CGRect)frame text:(NSString *)text inView:(UIView *)containerView{
NSLog(@"%@ '%@'",self.class, NSStringFromSelector(_cmd));

UILabel *labelView = [[UILabel alloc] initWithFrame:frame];
labelView.font = [UIFont fontWithName:@"Helvetica" size:30.0];
labelView.textAlignment = NSTextAlignmentCenter;
labelView.text = text;

[containerView addSubview:labelView];

return labelView;
}

-(FFractSupportedTextField *)createAnswerField:(CGRect)frame{
NSLog(@"%@ '%@'",self.class, NSStringFromSelector(_cmd));

FFractSupportedTextField *fieldView = [[FFractSupportedTextField alloc] initWithFrame:frame];

//Inside
fieldView.font = [UIFont fontWithName:@"Helvetica" size:30.0];
fieldView.textAlignment = NSTextAlignmentCenter;
fieldView.placeholder = @"?";

//border
fieldView.layer.borderWidth = 1;
fieldView.layer.borderColor = [[UIColor blackColor] CGColor];
fieldView.layer.cornerRadius = 5.0;

fieldView.userInteractionEnabled = YES;

return fieldView;
}

-(UIView *)createFractPictureForNumerator:(NSInteger)numerator denominator:(NSInteger)denominator number:(NSInteger)viewNumber{
NSLog(@"%@ '%@'",self.class, NSStringFromSelector(_cmd));

NSLog(@"numerator:%ld denominator:%ld",(long)numerator,(long)denominator);

UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(33, 165, 256, 78)];
containerView.backgroundColor = [UIColor whiteColor];
containerView.layer.borderColor = [[UIColor lightGrayColor] CGColor];
containerView.layer.borderWidth = 1.0;
containerView.layer.cornerRadius = 3.0;

NSInteger smallViewCount = denominator;
if (denominator == 0) {
    smallViewCount = 1;
}

float smallWidth = 245.0/smallViewCount;

for (int n = 0; n < smallViewCount; n++) {
    NSLog(@"count %d",n);

    UILabel *smallLabel = [[UILabel alloc] initWithFrame:CGRectMake(8 + n*smallWidth, 8, smallWidth - 5, 29)];
    smallLabel.backgroundColor = [UIColor colorWithRed:195.0/255.0 green:222.0/255.0 blue:172.0/255.0 alpha:1.0];
    smallLabel.font = [UIFont fontWithName:@"Helvetica" size:17.0];
    [smallLabel setAdjustsFontSizeToFitWidth:YES];
    smallLabel.textAlignment = NSTextAlignmentCenter;
    smallLabel.layer.cornerRadius = 3.0;
    smallLabel.tag = 830+n + viewNumber*10;

    [containerView addSubview:smallLabel];
}

UILabel *largeLabel = [[UILabel alloc] initWithFrame:CGRectMake(8, 41, 240, 29)];
largeLabel.backgroundColor =  [UIColor colorWithRed:195.0/255.0 green:222.0/255.0 blue:172.0/255.0 alpha:1.0];
largeLabel.text = [NSString stringWithFormat:@"= %ld",(long)numerator];
largeLabel.textAlignment = NSTextAlignmentCenter;
largeLabel.layer.cornerRadius = 3.0;

[containerView addSubview:largeLabel];

NSLog(@"end of createFractPictFor..");
return containerView;

}