我已经使用 Storyboard实现了一个很好的界面,我决定我想要一个更漂亮的动画来呈现另一个 View Controller 。为了保持一致,这个动画需要一个 segue 和一个 unwind segue。所以我创建了我的 segue 来支持两者:
@interface FKCircularSegue : UIStoryboardSegue
/// If it's an unwind segue
@property (nonatomic,assign) BOOL unwind;
@property (nonatomic,assign) CGRect frameCircle;
@end
在进行转场和展开时效果很好。为了放松,我实现了这个方法:
- (UIStoryboardSegue *)segueForUnwindingToViewControllerUIViewController *)toViewController fromViewControllerUIViewController *)fromViewController identifierNSString *)identifier
{
if ([identifier isEqualToString"camera.take.close"])
{
// Circular segue!
FKCircularSegue *segue = [[FKCircularSegue alloc] initWithIdentifier:identifier source:fromViewController destination:toViewController];
segue.frameCircle = _frameCameraButtonTapped;
segue.unwind = YES;
return segue;
}
return [super segueForUnwindingToViewController:toViewController fromViewController:fromViewController identifier:identifier];
}
但是!我注意到所有其他正常的展开segues,从推送和模式(这是一种中央 View Controller )回来都停止工作,很明显,[super segueForUnwindingToViewController:toViewController fromViewController:fromViewController identifier:identifier] 没有这样做。
奇怪的是,调试器显示它实际上返回了一个 UIStoryboardSegue ,但它没有做任何事情,点击一个通常会“弹出”你回到这个 View Controller 的按钮什么也没做。
另一方面,如果我注释掉整个 segueForUnwind... 方法,它就会恢复正常,所以 UIViewController 的默认实现是正确的一个。
简而言之,我的问题是,我怎样才能支持一个自定义展开 segue,然后为其他所有展开 segue 使用默认选项?
Best Answer-推荐答案 strong>
嗯,我想通了。
结果表明 super 方法没问题,问题出在我创建的 UINavigationController 子类上,该子类将调用转发到此 View Controller 。
为了解决这个问题,我添加了一个任何 View Controller 都可以实现的协议(protocol),并且基本上询问它是否要处理展开转场,或者它应该由导航 Controller 自动完成。
非常冗长,但我认为它比编辑之前发布的解决方案要好。
FKNavigationController.h
/**
* Implement this if you want custom unwind segues
*/
@protocol FKNavigationControllerSegueForwarding <NSObject>
- (BOOL)shouldPerformUnwindSegueFromNavigationControllerWithIdentifierNSString*)identifier fromViewControllerUIViewController*)viewController;
@end
/**
* Automatically forwards segue methods
*/
@interface FKNavigationController : UINavigationController
@end
FKNavigationController.m
@implementation FKNavigationController
- (UIStoryboardSegue *)segueForUnwindingToViewControllerUIViewController *)toViewController fromViewControllerUIViewController *)fromViewController identifierNSString *)identifier
{
if ([toViewController respondsToSelectorselector(shouldPerformUnwindSegueFromNavigationControllerWithIdentifier:fromViewController])
{
if ([(id<FKNavigationControllerSegueForwarding>)toViewController shouldPerformUnwindSegueFromNavigationControllerWithIdentifier:identifier fromViewController:fromViewController])
{
return [toViewController segueForUnwindingToViewController:toViewController fromViewController:fromViewController identifier:identifier];
}
}
return [super segueForUnwindingToViewController:toViewController fromViewController:fromViewController identifier:identifier];
}
@end
更新的 View Controller
#pragma mark - Segue forwarding
- (BOOL)shouldPerformUnwindSegueFromNavigationControllerWithIdentifierNSString *)identifier fromViewControllerUIViewController *)viewController
{
if ([identifier isEqualToString"camera.take.close"])
{
return YES;
}
return NO;
}
- (UIStoryboardSegue *)segueForUnwindingToViewController:(UIViewController *)toViewController fromViewController:(UIViewController *)fromViewController identifier:(NSString *)identifier
{
// Check the FKNavigationControllerSegueForwarding if you want to add more.
if ([identifier isEqualToString"camera.take.close"])
{
// Circular segue!
FKCircularSegue *segue = [[FKCircularSegue alloc] initWithIdentifier:identifier source:fromViewController destination:toViewController];
segue.frameCircle = _frameCameraButtonTapped;
segue.unwind = YES;
return segue;
}
return [super segueForUnwindingToViewController:toViewController fromViewController:fromViewController identifier:identifier];
}
关于ios - 支持自定义和默认展开 segues,我们在Stack Overflow上找到一个类似的问题:
https://stackoverflow.com/questions/23204006/
|