需要实现简单的cell拖动效果
首先是在你的TableView上添加长按手势，然后实现长按手势就可以了
一、添加长按手势
UILongPressGestureRecognizer *longTap = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handlelongGesture:)];
[_tableView addGestureRecognizer:longTap];
二、实现长按拖动效果
#pragma mark - Cell拖动排序
- (void)handlelongGesture:(UILongPressGestureRecognizer *)sender
{
UILongPressGestureRecognizer *longPress = (UILongPressGestureRecognizer *)sender;
UIGestureRecognizerState state = longPress.state;
CGPoint location = [sender locationInView:self.tableView];
NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:location];
static UIView *snapshot = nil;
static NSIndexPath *sourceIndexPath = nil;
switch (state) {
case UIGestureRecognizerStateBegan: {
if (indexPath) {
sourceIndexPath = indexPath;
UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];
// Take a snapshot of the selected row using helper method.
snapshot = [self customSnapshoFromView:cell];
// Add the snapshot as subview, centered at cell's center...
__block CGPoint center = cell.center;
snapshot.center = center;
snapshot.alpha = 0.0;
[self.tableView addSubview:snapshot];
[UIView animateWithDuration:0.25 animations:^{
// Offset for gesture location.
center.y = location.y;
snapshot.center = center;
snapshot.transform = CGAffineTransformMakeScale(1.05, 1.05);
snapshot.alpha = 0.98;
cell.alpha = 0.0f;
} completion:^(BOOL finished) {
cell.hidden = YES;
}];
}
break;
}
case UIGestureRecognizerStateChanged: {
CGPoint center = snapshot.center;
center.y = location.y;
snapshot.center = center;
// Is destination valid and is it different from source?
if (indexPath && ![indexPath isEqual:sourceIndexPath]) {
// ... update data source.
// 这里需要注意，我是以section为单位写的
[self.dateList exchangeObjectAtIndex:indexPath.section withObjectAtIndex:sourceIndexPath.section];
// ... move the rows.
// 你要看你是拖动section还是拖动row了[]([]())
// [self.tableView moveRowAtIndexPath:sourceIndexPath toIndexPath:indexPath];
[self.tableView moveSection:sourceIndexPath.section toSection:indexPath.section];
// ... and update source so it is in sync with UI changes.
sourceIndexPath = indexPath;
}
break;
}
default: {
// Clean up.
UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:sourceIndexPath];
[UIView animateWithDuration:0.25 animations:^{
snapshot.center = cell.center;
snapshot.transform = CGAffineTransformIdentity;
snapshot.alpha = 0.0;
cell.alpha = 1.0f;
} completion:^(BOOL finished) {
cell.hidden = NO;
[snapshot removeFromSuperview];
snapshot = nil;
}];
sourceIndexPath = nil;
break;
}
}
}
- (UIView *)customSnapshoFromView:(UIView *)inputView
{
UIView *snapshot = nil;
if ([[[UIDevice currentDevice] systemVersion] doubleValue] < 7.0) {
//ios7.0 以下通过截图形式保存快照
snapshot = [self customSnapShortFromViewEx:inputView];
}else{
//ios7.0 系统的快照方法
snapshot = [inputView snapshotViewAfterScreenUpdates:YES];
}
snapshot.layer.masksToBounds = NO;
snapshot.layer.cornerRadius = 0.0;
snapshot.layer.shadowOffset = CGSizeMake(-5.0, 0.0);
snapshot.layer.shadowRadius = 5.0;
snapshot.layer.shadowOpacity = 0.4;
return snapshot;
}
- (UIView *)customSnapShortFromViewEx:(UIView *)inputView
{
CGSize inSize = inputView.bounds.size;
// 下面方法，第一个参数表示区域大小。第二个参数表示是否是非透明的。如果需要显示半透明效果，需要传NO，否则传YES。第三个参数就是屏幕密度了
UIGraphicsBeginImageContextWithOptions(inSize, NO, [UIScreen mainScreen].scale);
[inputView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image= UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageView* snapshot = [[UIImageView alloc] initWithImage:image];
return snapshot;
}
