Question

我如何动态调整UIScrollView的高度？基本上我创建了一堆UILabels（UILabel的确切数量是随机的），UIScrollView是自动调整其高度以容纳UILables。这就是我目前在viewDidLoad中所拥有的。

- (void)viewDidLoad
{
[scroller setScrollEnabled:YES];
[scroller setContentSize:CGSizeMake(320
                                    , 1500)];
scroller.indicatorStyle = UIScrollViewIndicatorStyleWhite;
{

这是创建额外UILavels的动作

-(IBAction)scheduale{
int i;
for(i=0; i<[self retrieveTime] ; i++){
    //Add time label
    UILabel *timeLabel = [[UILabel alloc] init];
    timeLabel.frame = CGRectMake(10, (i+1) * 21, 31, 20);
    timeLabel.textColor = [UIColor whiteColor];
    timeLabel.backgroundColor = [UIColor colorWithRed:76.0/225.0 green:76.0/225.0 blue:76.0/225.0 alpha:1.0];
    NSString *labelString;
    labelString = [[NSNumber numberWithInt:i] stringValue];
    timeLabel.text = labelString;
    timeLabel.textAlignment = UITextAlignmentCenter;
    //theLabel.tag = (i+1) * 100;
    [scroller addSubview:timeLabel];
}

Answer 1

您需要保留一个变量，以便在创建标签时跟踪要添加的标签数量和设置内容大小的高度。请参阅以下调整后的代码：

-(IBAction)scheduale{

 int i; 
 int contentSize = 0;

 for(i=0; i<[self retrieveTime] ; i++){

     UILabel *timeLabel = [[UILabel alloc] init];
     timeLabel.frame = CGRectMake(10, (i+1) * 21, 31, 20);
     contentSize += 20;
     timeLabel.textColor = [UIColor whiteColor];
     timeLabel.backgroundColor = [UIColor colorWithRed:76.0/225.0 green:76.0/225.0 blue:76.0/225.0 alpha:1.0];
     NSString *labelString;
     labelString = [[NSNumber numberWithInt:i] stringValue];
     timeLabel.text = labelString;
     timeLabel.textAlignment = UITextAlignmentCenter;
     //theLabel.tag = (i+1) * 100;
     [scroller addSubview:timeLabel]; }

 [scroller setContentSize:CGSizeMake(320, contentSize)];

Answer 2

我同意@Kyle，但内容大小将随着标签的位置前进，以最后一个位置+最后一个高度结束。所以他的想法需要在那里进行一些调整。

另外，只是为了确认：@world peace - 您想要更改滚动条的框架，还是仅仅是内容大小？ @Kyle是正确的，您必须至少更改内容大小。

以下是对该代码的一点清理：

#define kButtonWidth   31.0
#define kButtonHeight  20.0
#define kMargin         1.0

-(IBAction)scheduale {

    int i;
    CGFloat contentPositionY = 0.0;

    UIColor *labelColor = [UIColor colorWithRed:76.0/225.0 green:76.0/225.0 blue:76.0/225.0 alpha:1.0];

    for(i=0; i<[self retrieveTime] ; i++){
        //Add time label
        UILabel *timeLabel = [[UILabel alloc] init];

        timeLabel.frame = CGRectMake(0, contentPositionY, kButtonWidth, kButtonHeight);
        contentPositionY += kButtonHeight + kMargin;

        timeLabel.textColor = [UIColor whiteColor];
        timeLabel.backgroundColor = labelColor;

        timeLabel.text = [NSString stringWithFormat:@"@d", i];

        timeLabel.textAlignment = UITextAlignmentCenter;
        //theLabel.tag = (i+1) * 100;
        [scroller addSubview:timeLabel];
    }

    // now size the content
    scroller.contentSize = CGSizeMake(kButtonWidth, contentPositionY + kButtonHeight);

    // and to get the margins you built into the loop calculation
    scroller.contentInset = UIEdgeInsetsMake(21, 10, 0, 0);   // your code implied these values
}

自动调整UIScrollView高度

2 个答案: