Ios 更新UIlabel的文本
我有一个幻灯片,可以从数据库中收集一系列图像。每个图像都有与其关联的描述和其他属性。基本上,我想在每次加载新图像时更新UILabel的文本。我该怎么做 以下是我的工作内容:Ios 更新UIlabel的文本,ios,objective-c,uilabel,Ios,Objective C,Uilabel,我有一个幻灯片,可以从数据库中收集一系列图像。每个图像都有与其关联的描述和其他属性。基本上,我想在每次加载新图像时更新UILabel的文本。我该怎么做 以下是我的工作内容: //SLIDE MENU - (void)loadVisiblePages { // First, determine which page is currently visible CGFloat pageWidth = gridView.frame.size.width; NSInteger p
//SLIDE MENU
- (void)loadVisiblePages {
// First, determine which page is currently visible
CGFloat pageWidth = gridView.frame.size.width;
NSInteger page = (NSInteger)floor((gridView.contentOffset.x * 2.0f + pageWidth) / (pageWidth * 2.0f));
//NSArray * descriptArray[20];
// Update the page control
pageControl.currentPage = page;
// Work out which pages you want to load
NSInteger firstPage = page - 1;
NSInteger lastPage = page + 1;
// Purge anything before the first page
for (NSInteger i=0; i<firstPage; i++) {
[self purgePage:i];
}
for (NSInteger i=firstPage; i<=lastPage; i++) {
[self loadPage:i];
// descriptArray[i] = selectedPhotoDesc;
}
for (NSInteger i=lastPage+1; i<self.pageImages.count; i++) {
[self purgePage:i];
}
}
- (void)loadPage:(NSInteger)page {
NSURL* imageURL = [NSURL URLWithString:[NSString stringWithFormat:@"%@%@%@/%@.jpg", host, photoPath, collection, photoNumber]];
//get photo from server
NSData *imageData = [[NSData alloc] initWithContentsOfURL:imageURL];
UIImage *image = [[UIImage alloc] initWithData: imageData];
if (page < 0 || page >= 20) {
return;
}
// Load an individual page, first checking if you've already loaded it
UIView *pageView = [self.pageViews objectAtIndex:page];
if ((NSNull*)pageView == [NSNull null]) {
CGRect frame = gridView.bounds;
frame.origin.x = frame.size.width * page;
frame.origin.y = 0.0f;
frame = CGRectInset(frame, 10.0f, 0.0f);
UIImageView *newPageView = [[UIImageView alloc] initWithImage:image];
newPageView.frame = frame;
[gridView addSubview:newPageView];
labelDescription.text = descriptionArray[page];
[self.pageViews replaceObjectAtIndex:page withObject:newPageView];
}
}
- (void)purgePage:(NSInteger)page {
if (page < 0 || page >= self.pageImages.count) {
// If it's outside the range of what you have to display, then do nothing
return;
}
// Remove a page from the scroll view and reset the container array
UIView *pageView = [self.pageViews objectAtIndex:page];
if ((NSNull*)pageView != [NSNull null]) {
[pageView removeFromSuperview];
[self.pageViews replaceObjectAtIndex:page withObject:[NSNull null]];
labelDescription.text = @"";
}
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
// Load the pages that are now on screen
[self loadVisiblePages];
}
//幻灯片菜单
-(无效)加载可视页面{
//首先,确定当前可见的页面
CGFloat pageWidth=gridView.frame.size.width;
NSInteger页面=(NSInteger)楼层((gridView.contentOffset.x*2.0f+pageWidth)/(pageWidth*2.0f));
//NSArray*描述符数组[20];
//更新页面控件
pageControl.currentPage=页面;
//确定要加载的页面
NSInteger firstPage=第1页;
NSInteger lastPage=第+1页;
//清除第一页之前的任何内容
对于(NSInteger i=0;i)您可以使用与标签的页面视图
相同的逻辑。有比此方法更好的选项,可以使用UICollectionView或UIPageViewController来简化操作。我没有注意您的代码,因为我认为您正在尝试重新发明轮子。只需使用以下库-(使用iCarouselTypeLinear)