如何刷新充满照片的 UIView 的内容

Question

我有一个从表视图调用的模态视图。每当我调用模态视图时，我都会在模态视图内设置一个小视图，其中包含一些可滚动的图片。问题是，当我返回表视图并选择表的另一行时，旧图像应该消失，而新图像出现，但这种情况没有发生。好像当我第一次加载模态视图时，它填充了最初的两张图片，当我再次加载它时，它不断添加新图片和旧图片。

这是代码：

- (void)layoutScrollImages {
UIImageView *view = nil;
NSArray *subviews = [scrollView1 subviews];
//NSMutableArray *subviews = [scrollView1 subviews];

// reposition all image subviews in a horizontal serial fashion
CGFloat curXLoc = 0;
for (view in subviews)
{
    if ([view isKindOfClass:[UIImageView class]] && view.tag > 0)
    {
        CGRect frame = view.frame;
        frame.origin = CGPointMake(curXLoc, 0);
        view.frame = frame;

        curXLoc += (kScrollObjWidth);
    }
}

// set the content size so it can be scrollable
[scrollView1 setContentSize:CGSizeMake(([self.nomeFotos count] * kScrollObjWidth), [scrollView1 bounds].size.height)];
}

和：

- (void)setScrollingImages {
//self.view.backgroundColor = [UIColor viewFlipsideBackgroundCol];

// 1. setup the scrollview for multiple images and add it to the view controller
//
// note: the following can be done in Interface Builder, but we show this in code for clarity
[scrollView1 setBackgroundColor:[UIColor blackColor]];
[scrollView1 setCanCancelContentTouches:NO];
scrollView1.indicatorStyle = UIScrollViewIndicatorStyleWhite;
scrollView1.clipsToBounds = YES;        // default is NO, we want to restrict drawing within our scrollview
scrollView1.scrollEnabled = YES;

// pagingEnabled property default is NO, if set the scroller will stop or snap at each photo
// if you want free-flowing scroll, don't set this property.
scrollView1.pagingEnabled = YES;

// load all the images from our bundle and add them to the scroll view
NSUInteger i;
for (i = 1; i <= [self.nomeFotos count]; i++)
{
    NSString *imageName = [NSString stringWithFormat:[self.nomeFotos objectAtIndex:(i-1)]];
    UIImage *image = [UIImage imageNamed:imageName];
    UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
    NSLog(@"%@", imageName);
    // setup each frame to a default height and width, it will be properly placed when we call "updateScrollList"
    CGRect rect = imageView.frame;
    rect.size.height = kScrollObjHeight;
    rect.size.width = kScrollObjWidth;
    imageView.frame = rect;
    imageView.tag = i;  // tag our images for later use when we place them in serial fashion
    [scrollView1 addSubview:imageView];
}

[self layoutScrollImages];  // now place the photos in serial layout within the scrollview
}

Answer 1

我只是想出了我想要的，解决方案是删除所有当前的子视图，然后添加新视图..代码如下：

for (UIView* subView in [self.view.subviews]) {
    [subView removeFromSuperview]; 
}

我将此代码放在我的视图中将会出现，每次视图出现时，它都会清除其子视图并我调用该方法来添加新的子视图（图片）。

谢谢