近期应公司组长要求做个wwdc17的分享，顺便记录一下。
Nav Large Titles 大导航栏
UITableView Swipe Api 左右滑动新API
1.Nav Large Titles
设置是否为大导航栏的属性：
@property (nonatomic, readwrite, assign) BOOL prefersLargeTitles; //Defaults to NO.
self.navigationController.navigationBar.prefersLargeTitles = true;
为大导航栏时，（prefersLargeTitles = true）时大导航栏显示样式：
通过这个可以控制不同需求的导航栏样式
3个枚举值
@property (nonatomic, readwrite, assign) UINavigationItemLargeTitleDisplayMode largeTitleDisplayMode;
self.navigationItem.largeTitleDisplayMode = UINavigationItemLargeTitleDisplayModeNever;
typedef NS_ENUM(NSInteger, UINavigationItemLargeTitleDisplayMode) {
UINavigationItemLargeTitleDisplayModeAutomatic,
UINavigationItemLargeTitleDisplayModeAlways,
UINavigationItemLargeTitleDisplayModeNever,
}
2.UITableView Swipe Api
iOS新增的UITableViewDelegate 代理方法
构造一个UIContextualAction，与UIAlertAction类似, action回调在block里面。 有UIContextualActionStyleNormal和UIContextualActionStyleDestructive两种样式，还可以设置背景色，标题，图片。
把生成的UIContextualAction放进数组，对的，所以可以有多个左滑动或者右滑动的视图，构造UISwipeActionsConfiguration，返回就行啦
UISwipeActionsConfiguration 有个performsFirstActionWithFullSwipe的属性是指第一个UIContextualAction是否支持是滑动范围很大（整个屏幕时）触发action
//left views
- (nullable UISwipeActionsConfiguration *)tableView:(UITableView *)tableView leadingSwipeActionsConfigurationForRowAtIndexPath:(nonnull NSIndexPath *)indexPath{
BOOL hasLike = [self.likeArr containsObject:self.list[indexPath.row]];
NSString *title = hasLike ? @"unlike":@"like";
UIContextualAction *action = [UIContextualAction contextualActionWithStyle:UIContextualActionStyleNormal title:title handler:^(UIContextualAction * _Nonnull action, __kindof UIView * _Nonnull sourceView, void (^ _Nonnull completionHandler)(BOOL)) {
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
if (hasLike) {
cell.accessoryType = UITableViewCellAccessoryNone;
[self.likeArr removeObject:self.list[indexPath.row]];
}else{
cell.accessoryType = UITableViewCellAccessoryCheckmark;
[self.likeArr addObject:self.list[indexPath.row]];
}
completionHandler(true);
}];
UISwipeActionsConfiguration *configuration = [UISwipeActionsConfiguration configurationWithActions:@[action]];
configuration.performsFirstActionWithFullSwipe = false;
return configuration;
}
//right views
- (nullable UISwipeActionsConfiguration *)tableView:(UITableView *)tableView trailingSwipeActionsConfigurationForRowAtIndexPath:(NSIndexPath *)indexPath
{
UIContextualAction *action = [UIContextualAction contextualActionWithStyle:UIContextualActionStyleDestructive title:@"delete" handler:^(UIContextualAction * _Nonnull action, __kindof UIView * _Nonnull sourceView, void (^ _Nonnull completionHandler)(BOOL)) {
[self.list removeObjectAtIndex:indexPath.row];
completionHandler(true);
}];
UISwipeActionsConfiguration *configuration = [UISwipeActionsConfiguration configurationWithActions:@[action]];
configuration.performsFirstActionWithFullSwipe = false;
return configuration;
}
