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我有一个 UITextField 在点击时不会成为第一响应者。我可以将其分配为第一响应者，这可以找到。但是，如果它放弃了第一响应者的状态并且我尝试点击它或返回它以使其再次成为第一响应者，则没有任何反应。看起来好像触摸被困在某个地方，但我在我的代码中找不到任何可能导致这种情况发生的东西。我检查了通常的嫌疑人：

  1. 如果文本字段是顶视图
  2. 是它的超级视图范围内的文本字段
  3. 是文本字段 userEnabled。

我还以几种不同的方式重写了代码，但无济于事。

谁能帮我解决这个问题。answerTextField有问题的 textField 是方法中标题的字段createOneDoubleViewAtOrigin。

相关代码如下。

-(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;

}
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