将多个 UIButton 添加到 ScrollView

Question

伙计们，我正在尝试在滚动视图中动态添加多个按钮

到目前为止，我有这个代码

for (int i = 0; i < numberOfButtonInMenu; i++)
{
    UIButton *aButton = [UIButton new];
    UILabel *tButton = [UILabel new];
    UILabel *sButton = [UILabel new];
    UIImageView *iButton = [UIImageView new];

    tButton = title;
    sButton = subtitle;
    iButton = image;

    tButton.hidden = NO;
    sButton.hidden = NO;
    iButton.hidden = NO;
    [tButton setText:Titles[i]];
    [sButton setText:Subtitles[i]];        
    [tButton sizeToFit];
    [sButton sizeToFit];

    iButton.image = [UIImage imageNamed:Images[i]];
    aButton.frame = CGRectMake(xCoord, yCoord, screenWidth, buttonHeight);
    [aButton addTarget:self action:@selector(whatever:) forControlEvents:UIControlEventTouchUpInside];
    [aButton addSubview:tButton];
    [aButton addSubview:sButton];
    [aButton addSubview:iButton];
    [multiMenuScroll addSubview:aButton];
    yCoord += buttonHeight + buffer;
}

}

我所有的设计都是在这之前设置的for。当我显示 multiMenuScrollView 时，我最终只显示了最后一个按钮。（所以对于 numberOfButtonInMenu = 3; 我将只显示第三个按钮）

看起来像这样：http://i.stack.imgur.com/5UU6S.jpg

在 "Explore" 和 "Around You" 之间还有另外两个按钮，但里面什么也没有，有点奇怪。你们知道我做错了什么吗？

Answer 1

因为你在 aButton1 中又添加了 tButton sButton iButton 到 aButton3。 show 只会在最后一个视图中显示 (aButton3)。如果想像您的代码一样向每个按钮添加 tButton sButton iButton，则需要在每个 for 循环中初始化新的 tButton sButton iButton。

错误代码：

tButton = title;
sButton = subtitle;
iButton = image;

它必须是这样的：

UILabel *tButton = [[UILabel alloc] initWithFrame:...];
UILabel *sButton = [[UILabel alloc] initWithFrame:...];
UIImageView *iButton = [[UIImageView alloc] initWithFrame:...];

Answer 2

难怪...

您没有正确设置框架。在 for 循环中，每次创建新按钮 UIButton *aButton = [UIButton new]; 并将子视图添加到 multiMenuScroll。所有这些都被添加但在同一个地方。所以，最后只出现了第三个按钮。

您需要正确设置按钮的框架。

UIButton *aButton = [[UIButton alloc] initWithFrame:<Set_Your_Frame>]; // Change X or Y value as per for loop iteration.

附带说明一下，您将标签命名为按钮后缀，例如 tButton、sButton。它以编程方式没有错，但他们混淆了！

Answer 3

vwScroll = 滚动视图的名称 tagsArray = NSString 数组。这些字符串将是标签的文本，将以水平方式添加到滚动视图

-(void)setScrollViewWithArray:(NSArray *)tagsArray{
    CGFloat xAxis = 0.0f;
    CGFloat gapBwLabels = 10.0f;
    [vwScroll.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
    for (int i = 0; i<tagsArray.count; i++) {
        NSString *tagName = [tagsArray objectAtIndex:i];
        CGSize sizeOfTagString = [self getSizeOfText:tagName];
        CGFloat width = sizeOfTagString.width+gapBwLabels;

        CGRect tagLabelframe = CGRectMake(xAxis, 2, width, 30);
        UILabel *lblTag = [[UILabel alloc]initWithFrame:tagLabelframe];
        [self setLabel:lblTag withBackgroundColor:[UIColor whiteColor]];
        [lblTag setText:tagName];
        [vwScroll addSubview:lblTag];
        xAxis = xAxis + width + gapBwLabels;
    }

    [vwScroll setContentSize:CGSizeMake(xAxis, vwScroll.frame.size.height)];

}

将多个 UIButton 添加到 ScrollView

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