iOS 模拟出一个半透明的ViewController presentViewController 实现

来源：互联网发布：什么软件获得集分宝编辑：程序博客网时间：2024/05/19 22:03

最近项目有需求, 需要模态初一个半透明的视图, 好多人都碰到这个问题吧, 在目标视图中设置背景颜色然后发现模态动作结束后变成了黑色或者不是半透明的颜色。

所以今天来告诉大家解决方案

- (IBAction)Avtion1:(id)sender {    TestViewController * testVC = [TestViewController new];    self.definesPresentationContext = YES; //self is presenting view controller    testVC.view.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:.4];    testVC.modalPresentationStyle = UIModalPresentationOverCurrentContext;    [self presentViewController:testVC animated:YES completion:nil];}

注意：如果present 一个NavController，不能完全使用上面代码。

- (IBAction)pushSecond:(id)sender{
    SecondViewController * testVC = [SecondViewController new];
    
    self.definesPresentationContext = YES; //self is presenting view controller
    testVC.view.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:.5];
//    testVC.modalPresentationStyle = UIModalPresentationOverCurrentContext;
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:testVC];
    nav.modalPresentationStyle = UIModalPresentationOverCurrentContext;
    nav.view.backgroundColor = [UIColor clearColor];
    [self presentViewController:nav animated:YES completion:nil];
}

definesPresentationContext

/*  Determines which parent view controller's view should be presented over for presentations of type  UIModalPresentationCurrentContext.  If no ancestor view controller has this flag set, then the presenter  will be the root view controller.*/

backgroundColor

设置你的背景颜色

modalPresentationStyle

/*  Defines the transition style that will be used for this view controller when it is presented modally. Set  this property on the view controller to be presented, not the presenter.  Defaults to  UIModalTransitionStyleCoverVertical.*/

Demo 如下：

https://github.com/lihongli528628/PreDemo

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