我有一个观点,我希望以标准方式呈现给用户(从屏幕底部向上滑动).大约一半的视图是透明背景,下半部分有一些输入字段(想象键盘弹出的方式).当我在rootViewController上调用[self presentViewController]时,它会向上滑动视图,但是大约半秒之后,视图过去是透明的,而是用黑色代替.这与presentViewController和presentModalViewController都会发生.如何改变这种行为?
解决方法
这是可能的,rockybalboa在
raywenderlich.com论坛帖子中提供了解决此问题的方法:
iOS 8 UIModalPresentationCurrentContext is not transparent?
该解决方案在Objective-C中引用了巴尔博亚的答案:
Before iOS 8,you do this:
[backgroundViewController setModalPresentationStyle:UIModalPresentationCurrentContext]; [backgroundViewController presentViewController:_myMoreAppsViewController animated:NO completion:nil];
in iOS 8,you have to do this:
backgroundViewController.providesPresentationContextTransitionStyle = YES; backgroundController.definesPresentationContext = YES; [overlayViewController setModalPresentationStyle:UIModalPresentationOverCurrentContext];
用Swift等价物来补充上面的代码:
backgroundViewController.providesPresentationContextTransitionStyle = true backgroundController.definesPresentationContext = true overlayViewController.modalPresentationStyle = .OverCurrentContext
在iOS 8.1和Swift 1.2上使用Xcode 6.3 beta 3实现了这一点,它完美无缺.