我有一个标记视图（uiview），它永远地反复遍历我想要检测的一堆uicollectionviewcells，并可能改变检测到的那些细胞的颜色，并在标记经过细胞时将其重置。
到目前为止我所拥有的：
View did appear :
CADisplayLink *displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(displayLinkHandler)];
[displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
- (void) displayLinkHandler {
id presentationLayer1 = marker.markerLine.layer.presentationLayer;
for (NSIndexPath* cellPath in [seqcollectionview indexPathsForVisibleItems]) {
UICollectionViewCell *cell = [seqcollectionview cellForItemAtIndexPath:cellPath];
id presentationLayer2 = cell.layer.presentationLayer;
BOOL nowIntersecting = CGRectIntersectsRect([presentationLayer1 frame], [presentationLayer2 frame]);
// I'll keep track of whether the two views were intersected in a class property,
// and therefore only display a message if the intersected state changes.
if (nowIntersecting != wasIntersected) {
if (nowIntersecting && cell.selected) {
NSLog(@"row is: %d section is: %d", [cellPath row], [cellPath section]);
cell.backgroundColor = [UIColor whiteColor];
}else{
cell.backgroundColor = [UIColor colorWithRed:1 green:0.855 blue:0.741 alpha:1];
}
wasIntersected = nowIntersecting;
}
}
}
到目前为止，这种方法有效，但颜色变化的延迟时间太长了！
干杯