我有一个带有登录按钮的视图。单击按钮时,我添加了一个包含登录字段的视图。发生这种情况时,我需要调暗父视图。我该怎么做?
user745235
问问题
5388 次
4 回答
13
UIViews
有一个名为mask
.
mask
将始终位于拥有它的UIView之上。
所以,你的方法应该是这样的:
(这是为 Swift 设计的,但它很容易转换为 Obj-c)
self.view.mask = UIView(frame: self.frame)
self.view.mask?.backgroundColor = UIColor.black.withAlphaComponent(0.5)
//Do your work here, block UI, anything you need to, and then...
self.view.mask = nil
更新
- 删除了 Swift 2 引用,因为它不再相关。出于好奇,该属性被称为
maskView
于 2016-05-12T22:27:26.250 回答
8
在最初透明且背景颜色为黑色的父视图上添加 UIView。当您需要调暗它时,将视图的 alpha 更改为 0.5。这将是 50% 透明的。
于 2011-08-08T18:51:27.500 回答
3
我会去一个白色背景的视图:
whiteView=[[UIView alloc]initWithFrame:viewToDim.frame];
[whiteView setBackgroundColor:[UIColor whiteColor]];
[whiteView setAlpha:0.5f];
[self.view insertSubview:whiteView aboveSubview:viewToDim];
于 2014-06-24T21:04:46.960 回答
0
class UIDecorator: NSObject {
static let sharedInstance = UIDecorator()
private let dimView = UIView()
private let loadingView = MOOverWatchLoadingView(frame: CGRectMake(0, 0, 100, 100),
autoStartAnimation: true)
func showLoadingView() {
if let currentPage = UIApplication.topViewController(){
dimView.frame = currentPage.view.frame
dimView.backgroundColor = UIColor.blackColor()
dimView.alpha = 0.5
currentPage.view.addSubview(dimView)
currentPage.view.userInteractionEnabled = false
loadingView.center = currentPage.view.center
loadingView.backgroundColor = UIColor.clearColor()
currentPage.view.addSubview(loadingView)
}
}
func dismissLocadingView() {
if let currentPage = UIApplication.topViewController(){
currentPage.view.userInteractionEnabled = true
dimView.removeFromSuperview()
loadingView.removeFromSuperview()
}
}
}
于 2017-01-20T20:17:19.150 回答