如何輪播?
NSInteger curIndex = (self.collectionView.contentOffset.x + self.layout.itemSize.width * 0.5) / self.layout.itemSize.width; //計算將要滾到的Index,如果是將要滾到第一個，就把toIndex = 0; NSInteger toIndex = curIndex + 1; if (toIndex == self.totalPageCount) { toIndex = 0; [self.collectionView scrollToItemAtIndexPath:indexPath atScrollPosition:UICollectionViewScrollPositionNone animated:YES];pageControl
//需要在scrollViewDidScroll中計算 currentPage-(void)scrollViewDidScroll:(UIScrollView *)scrollView { int itemIndex = (scrollView.contentOffset.x + self.collectionView.xjy_width * 0.5) / self.collectionView.xjy_width; itemIndex = itemIndex % self.imageUrls.count; _pageControl.currentPage = itemIndex;}NSTimer
RunLoopMode kCFRunLoopCommonModes（RunLoop的問題看我的Runloop博文)@selector() 要執行自動輪播的方法 if (self.timer) { CFRunLoopTimerInvalidate(self.timer); CFRunLooPRemoveTimer(CFRunLoopGetCurrent(), self.timer, kCFRunLoopCommonModes); } __weak __typeof(self) weakSelf = self; CFRunLoopTimerRef timer = CFRunLoopTimerCreateWithHandler(kCFAllocatorDefault, CFAbsoluteTimeGetCurrent() + _timeInterval, _timeInterval, 0, 0, ^(CFRunLoopTimerRef timer) { [weakSelf autoScroll]; }); self.timer = timer; CFRunLoopAddTimer(CFRunLoopGetCurrent(), timer, kCFRunLoopCommonModes);新聞熱點
疑難解答
