ios - UILabel 更新文本，但不会删除旧文本

Question

编辑:我发现我需要删除 subview ，一旦 View 消失

[[self.scrollView subviews]makeObjectsPerformSelector:@selector(removeFromSuperview)];

我的问题是我有一个 UILabel 可以正确更新文本，但不会删除旧文本。我想可能是因为有 2 个 UILabels 相互叠加，这是它的图片:

这是我的代码。我看不到副本在哪里:

    for (int i = 0; i < array1.count; i++) {

    NSNumber *myNumber = [myscoretext objectAtIndex:i];
    float myScore = myNumber.floatValue;

    NSNumber *levelNumber = [neededscoretext objectAtIndex:i];
    float levelScore = levelNumber.floatValue;

    for (int i = 0; i < array1.count; i++) {

    NSNumber *myNumber = [myscoretext objectAtIndex:i];
    float myScore = myNumber.floatValue;

    NSNumber *levelNumber = [neededscoretext objectAtIndex:i];
    float levelScore = levelNumber.floatValue;

    float progressScore = ((float)myScore/(float)levelScore);


    CGRect frame;
    frame.origin.x = self.scrollView.frame.size.width * i;
    frame.origin.y = 0;
    frame.size = self.scrollView.frame.size;

    UIView *subview = [[UIView alloc] initWithFrame:frame];
    subview.backgroundColor = [UIColor clearColor];

    NSArray *colorArray = [NSArray arrayWithObjects:edmeral, turqouise, orange, red, nil];
    // Labeled progress views
    self.labeledProgressView = [[DALabeledCircularProgressView alloc]
                                initWithFrame:CGRectMake(25.0f, 20.0f, 100.0f, 100.0f)];
    self.labeledProgressView.roundedCorners = NO;
    self.labeledProgressView.trackTintColor = [UIColor colorWithWhite:1.0f alpha:0.8];

    imageLevel = [[UIImageView alloc] initWithFrame:CGRectMake(25.0f, 20.0f, 100.0f, 100.0f)];
    imageLevel.backgroundColor = [UIColor clearColor];


    self.Scoreint = [[UILabel alloc] initWithFrame:CGRectMake(-25.0f, 130, 195, 21)];
    self.Scoreint.backgroundColor = [UIColor clearColor];
    self.Scoreint.textColor = [UIColor blackColor];
    [self.Scoreint setFont:[UIFont fontWithName:@"HelveticaNeue-Thin" size:15]];
    self.Scoreint.textAlignment = NSTextAlignmentCenter;
    self.Scoreint.text = @"";


    if (myScore == 0) {

        NSString *scoreString = [NSString stringWithFormat:@"0 / %5ld", (long)levelScore];
        [self.Scoreint setText:scoreString];
    }
    else {

        NSString *scoreString = [NSString stringWithFormat:@"%5li / %5li", (long)myScore, (long)levelScore];
        [self.Scoreint setText:scoreString];

    }

    [subview addSubview:Scoreint];

我希望你们中的一些人能帮助我解决这个问题! :)

Answer 1

换句话说，你应该这样做，它每次都从 superView 中删除标签，然后再初始化它。

你这样修改代码，

if(self.Scoreint) {
[self.Scoreint removeFromSuperview];
}
self.Scoreint = [[UILabel alloc] initWithFrame:CGRectMake(-25.0f, 130, 195, 21)];
self.Scoreint.backgroundColor = [UIColor clearColor];
self.Scoreint.textColor = [UIColor blackColor];
[self.Scoreint setFont:[UIFont fontWithName:@"HelveticaNeue-Thin" size:15]];
self.Scoreint.textAlignment = NSTextAlignmentCenter;
self.Scoreint.text = @"";