带模式uiviewcontroller的透明背景

好笑,我昨天也在做同样的事。不幸的是,这似乎是不可能的。一旦模态视图控制器就位,上一个视图将隐藏。 看到这个 previous question on the topic .

你仍然可以使用你设置的视图控制器和nib文件-这是我的示例代码

- (void)showUpgrade {
    [self.upgradeVC viewWillAppear:NO];
    [self.view addSubview:self.upgradeVC.view];
    [self.upgradeVC viewDidAppear:NO];
}

- (void)hideUpgrade {
    [self.upgradeVC viewWillDisappear:NO];
    [self.upgradeVC.view removeFromSuperview];
    [self.upgradeVC viewDidDisappear:NO];
}

- (UpgradeViewController *)upgradeVC {
    if (_upgradeVC == nil) {
        _upgradeVC = [[UpgradeViewController alloc] initWithNibName:[NSString stringWithFormat:@"UpgradeView_%@", self.deviceType] bundle:nil];
        _upgradeVC.delegate = self;
    }
    return _upgradeVC;
}

您需要在模式视图控制器中存储对父视图控制器的引用,以便可以访问 -hide 方法。我是通过一个代表做的。

添加一些动画也很容易 -show 和 -隐藏 如果你想让它从屏幕底部向上动画-我就是懒得这么做。

iOS8增加了 UIModalPresentationOverFullScreen presentation style . 将其设置为显示的视图控制器 modalPresentationStyle . 对于更高级的需求,请考虑创建一个自定义 presentation controller .

现在有一种方法可以使用ios7自定义转换来实现这一点:

MyController * controller = [MyController new];
[controller setTransitioningDelegate:self.transitionController];
controller.modalPresentationStyle = UIModalPresentationCustom;
[self controller animated:YES completion:nil];

要创建自定义转换,需要两件事:

• transitionedelegate对象(实现 <UIViewControllerTransitionDelegate> )
• “animatedTransitioning”对象 (实施 <UIViewControllerAnimatedTransitioning> )

您可以在本教程中找到有关自定义转换的更多信息: http://www.doubleencore.com/2013/09/ios-7-custom-transitions/

试试这个:

ViewController *vc = [[ViewController alloc] init];
[vc setModalPresentationStyle:UIModalPresentationOverCurrentContext];
[self presentViewController:vc animated:YES completion:nil];

您是否尝试在模式视图控制器的子视图上循环并为每个视图设置背景色以清除?这是一个dfs递归函数。

- (void)setBackgroundToClearForView:(UIView *)view {
    if ([view subviews]) {
        for (UIView *subView in [view subviews]) {
            [self setBackgroundToClearForView:subView];
        }
    }

    if ([view respondsToSelector:@selector(setBackgroundColor:)]) {
        [view performSelector:@selector(setBackgroundColor:)
                   withObject:[UIColor clearColor]];
    }
}

要使用它,请调用:

[self setBackgroundToClearForView:self.view];

在里面 viewDidLoad .

这就行了..试试这个。

// for clear color or you can easily adjust the alpha here
 YourVC *vc=[[YourVC alloc]initWithNibName:@"YourVC" bundle:nil] ;
 vc.view.backgroundColor = [UIColor clearColor];
 self.modalPresentationStyle = UIModalPresentationCurrentContext;
 [self presentViewController:vc animated:NO completion:nil];

这样视图将全屏显示,而不是uimodalPresentationFormSheet。