提出一个透明的模态UIViewController [英] Present a transparent modal UIViewController

问题描述

我正在尝试自己创建一个自定义alertView（适用于iOS7 +），但我很难使用alertView演示文稿。

I'm trying to make a custom alertView (for iOS7+) on my own but I struggle with the alertView presentation.

我有一个黑色背景的UIViewController （alpha设置为0.25f），alertView作为子视图。

I have a UIViewController with a black background (alpha set to 0.25f), and a alertView as subview.

当我想显示alertView时，我以模态方式呈现viewController：

When I want to show the alertView, I present modally the viewController:

-(void) show 
{
    UIWindow* window = [[UIApplication sharedApplication] keyWindow];
    self.modalTransitionStyle = UIModalPresentationCustom;
    self.transitioningDelegate = self;
    [window.rootViewController presentViewController:self animated:YES completion:nil];
}

这是我的动画师对象：

-(NSTimeInterval) transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext
{
    NSLog(@"%s",__PRETTY_FUNCTION__);
    return 2;
}

-(void) animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
    NSLog(@"%s",__PRETTY_FUNCTION__);

    UIView* toView = [transitionContext viewForKey:UITransitionContextToViewKey];
    toView.alpha = 0;

    UIView* container = [transitionContext containerView];
    [container addSubview:toView];

    [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
        toView.alpha = 0.5;
    } completion:^(BOOL finished) {
        [transitionContext completeTransition:YES];
    }];
}

事情是：模式VC在背景中呈现VC时淡出它应该这样做，但是当动画结束时，呈现的VC将从后台删除。

The thing is: the modal VC is fading with the presenting VC in background as its supposed to do, but when the animation ends the presenting VC is removed from the background.

如果我调用 [transitionContext completeTransition：YES]; 相反，呈现的VC在后台但是在动画结束时删除了模态VC，所以如果我们发送'NO'，我猜上下文会取消演示。

If I call [transitionContext completeTransition:YES]; instead, the presenting VC is in background but the modal VC is removed at animation end, so I guess the context cancels the presentation if we send 'NO'.

有没有一种方法可以将演示VC保留在后台而不必创建它的快照并将其设置为模态VC视图的背景？

Is there a way to keep the presenting VC in background without having to make a snapshot of it and set it as background of the modal VC's view?

推荐答案

为了您的信息，
我终于使我的自定义alertView成为popUp部分的UIView的子类。
为了显示它，我只是将alertView添加为keyWindow的子视图，并使用约束来居中它，并在其后面放置一个透明的黑色背景视图。

For your information, I finally made my custom alertView a subclass of UIView for the "popUp part". To show it, I just add the alertView as subview of the keyWindow with the constraints to center it, and put a transparent black background view behind it.

由于它不是控制器，我必须自己管理UI旋转（仅适用于iOS 7，它可以在iOS 8中与UI一起旋转）。

As it's not a controller, I have to manage UI rotation by myself (only for iOS 7, it rotates well with the UI in iOS 8).

这篇关于提出一个透明的模态UIViewController的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！