ios 使用淡入动画呈现模态视图
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Present a modal view using fade-in animation
提问by Sandah Aung
I presented a login screen as follows modally. Correct me if I am not right.
我以模态方式呈现了一个登录屏幕，如下所示。如果我不对，请纠正我。
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
UIViewController *ivc = [storyboard instantiateViewControllerWithIdentifier:@"login"];//LOOK AT NEXT LINE
[self presentViewController:ivc animated:YES completion:nil];
The login screen does appear but the animation is a slide up one. I prefer a fade in and fade our animation. How can I do this?
登录屏幕确实出现，但动画是向上滑动的。我更喜欢淡入淡出我们的动画。我怎样才能做到这一点？
回答by ZeMoon
Just set the modalTransitionStyleproperty for the viewController. (Documentation)
只需设置modalTransitionStyleviewController的属性即可。（文档）
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
UIViewController *ivc = [storyboard instantiateViewControllerWithIdentifier:@"login"];
[ivc setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
[self presentViewController:ivc animated:YES completion:nil];
In Swift:
在斯威夫特：
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let viewController = storyboard.instantiateViewController(withIdentifier: "login")
viewController.modalTransitionStyle = .crossDissolve
present(viewController, animated: true, completion: nil)
回答by BennyTheNerd
Swift 3, 3.1, 4, 4.2(as of November 8, 2018)
Swift 3、3.1、4、4.2 （截至 2018 年 11 月 8 日）
var storyboard = UIStoryboard(name: "Main", bundle: nil)
var loginViewController = storyboard.instantiateViewController(withIdentifier: "login")
loginViewController.modalTransitionStyle = .crossDissolve
self.present(loginViewController, animated: true, completion: nil)
回答by Javier Calatrava Llavería
You have to set prestentation and transition style:
您必须设置演示和过渡样式：
self.activityAlertVC.modalPresentationStyle = .custom
self.activityAlertVC.modalTransitionStyle = .crossDissolve
