iOS之UITableViewCell左右滑動效果

標籤：

首先在 UITableViewCell.h 中聲明一個代理

@protocol UITableViewCellSlideDelegate <UITableViewDelegate>@optional- (void)tableView:(UITableView *)tableView slideToRightWithIndexPath:(NSIndexPath *)indexPath;- (void)tableView:(UITableView *)tableView slideToLeftWithIndexPath:(NSIndexPath *)indexPath;@end

然後在 UITableViewCell.m 中 建立一個手勢 UIPanGestureRecognizer，因為我們左右滑動的時候必須依賴拖動手勢，然後在 UIPanGestureRecognizer 的代理方法中進行判斷到底是左滑還是右滑

static const CGFloat kSlideWidth = 80;static const CGFloat kSlideWidthDelta = 0.08;#pragma mark - UIGestureRecognizerDelegate- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{    if (self.panGestureRecognizer == gestureRecognizer) {        CGPoint point = [self.panGestureRecognizer translationInView:self];        return fabs(point.x) > fabs(point.y);    } else {        return NO;    }}#pragma mark - Event Handler- (void)panGestureRecognizerHandler:(UIPanGestureRecognizer *)gestureRecognizer{    switch (gestureRecognizer.state) {        case UIGestureRecognizerStateChanged: {            CGPoint point = [gestureRecognizer translationInView:self];            CGFloat offset = point.x;            if (offset >= kSlideWidth) {                offset = kSlideWidth + (offset - kSlideWidth) * kSlideWidthDelta;                if (_parent.delegate && [_parent.delegate respondsToSelector:@selector(tableView:slideToRightWithIndexPath:)]) {                    id<UITableViewCellSlideDelegate> delgate = (id<UITableViewCellSlideDelegate>)_parent.delegate;                    [delgate tableView:_parent slideToRightWithIndexPath:_indexPath];                }            } else if (offset <= -kSlideWidth) {                offset = -kSlideWidth + (offset + kSlideWidth) * kSlideWidthDelta;                if (_parent.delegate && [_parent.delegate respondsToSelector:@selector(tableView:slideToLeftWithIndexPath:)]) {                    id<UITableViewCellSlideDelegate> delgate = (id<UITableViewCellSlideDelegate>)_parent.delegate;                    [delgate tableView:_parent slideToLeftWithIndexPath:_indexPath];                }            }            self.contentView.center = CGPointMake(self.center.x + offset,                                                  self.contentView.center.y);            break;        }        default:            break;    }}

最後就可以在外部調用代理方法進行相關的操作了

#pragma mark - UITableViewCellSlideDelegate- (void)tableView:(UITableView *)tableView slideToRightWithIndexPath:(NSIndexPath *)indexPath{    NSLog(@"向右滑動");}- (void)tableView:(UITableView *)tableView slideToLeftWithIndexPath:(NSIndexPath *)indexPath{    NSLog(@"向左滑動");}

iOS之UITableViewCell左右滑動效果