再看一下如何在应用内集成3Dtouch.
3D-touch操作分为轻按peek跟重按pop,根据apple官方设计规范,一般来说peek呼出预览视图,我在storyboard里面创建一个PreviewController用于描述呼出的预览视图,同时创建了一个DetailViewController用于显示最终显示的视图,同时我们应该注意,pop之后的视图应该与用户正常点击进去之后没有任何区别.
此时我们应用层级为
tableView---(peek)---->previewController---(pop)--->DetailviewController
无论何时,我们在使用3D-touch的时候应当先检查3D-touch的可用性
- (void)check3Dtouch
{
//检测3Dtouch是否可用,若可用注册预览视图代理
if (self.traitCollection.forceTouchCapability == UIForceTouchCapabilityAvailable) {
[self registerForPreviewingWithDelegate:self sourceView:self.view];
}
}
我们在viewWillAppear里面和用户进行3D-touch相关设置的时候都要检查可用性
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self check3Dtouch];
}
///用户可能进入设置开启/关闭3Dtouch的时候,在这里需要再次检测3Dtouch可用性
- (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection
{
[self check3Dtouch];
}
别忘了设置UIViewControllerPreviewingDelegate预览视图代理.
接下来只需要在对应的代理方法里面返回相应的控制器即可
- (UIViewController *)previewingContext:(id<UIViewControllerPreviewing>)previewingContext viewControllerForLocation:(CGPoint)location{
if ([self.presentedViewController isKindOfClass:[PreviewViewController class]]) {return nil;}
UIStoryboard *sb = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
PreviewViewController *previewController = [sb instantiateViewControllerWithIdentifier:@"preview"];
location = CGPointMake(10, 100);
return previewController;
}
- (void)previewingContext:(id<UIViewControllerPreviewing>)previewingContext commitViewController:(UIViewController *)viewControllerToCommit{
UIStoryboard *sb = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
DetailViewController *detailView = [sb instantiateViewControllerWithIdentifier:@"detailView"];
[self showViewController:detailView sender:self];
}
此时peek跟pop手势都已经集成完毕,这时候还想实现类似在preview下面添加alert的操作,如系统message里面的快捷回复
8.png
其实只需要在previewController里面实现
- (NSArray<id<UIPreviewActionItem>> *)previewActionItems方法即可.PS:在xcode6.3时OC添加了制定数组元组类型的功能,有利于写出更加严谨的代码,好评~
- (NSArray<id<UIPreviewActionItem>> *)previewActionItems
{
UIPreviewAction *action1 = [UIPreviewAction actionWithTitle:@"action1" style:UIPreviewActionStyleDefault handler:^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController) {
NSLog(@"action1 click");
}];
UIPreviewAction *action2 = [UIPreviewAction actionWithTitle:@"action2" style:UIPreviewActionStyleDestructive handler:^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController) {
NSLog(@"action2 click");
}];
UIPreviewAction *action3 = [UIPreviewAction actionWithTitle:@"action3" style:UIPreviewActionStyleSelected handler:^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController) {
NSLog(@"action3 click");
}];
UIPreviewActionGroup *group1 = [UIPreviewActionGroup actionGroupWithTitle:@"group1" style:UIPreviewActionStyleDefault actions:@[action1,action2]];
UIPreviewActionGroup *group2 = [UIPreviewActionGroup actionGroupWithTitle:@"group2" style:UIPreviewActionStyleDestructive actions:@[action1,action3]];
UIPreviewActionGroup *group3 = [UIPreviewActionGroup actionGroupWithTitle:@"group3" style:UIPreviewActionStyleSelected actions:@[action2,action3]];
// NSArray *items = @[action1,action2,action3];
// NSArray *items = @[group1,group2,group3];
NSArray *items = @[action1,group1,action2,group2,action3,group3];
return items;
}
有兴趣的话可以自己动手体会一下UIPreviewActionGroup与UIPreviewAction的区别.
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