Question

我按模式提供了一个登录屏幕。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];

登录屏幕确实出现，但动画是向上滑动的。我更喜欢淡入淡出动画。我怎么能这样做？

Answer 1

只需为viewController设置modalTransitionStyle属性即可。（Documentation）

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
UIViewController *ivc = [storyboard instantiateViewControllerWithIdentifier:@"login"];
[ivc setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
[self presentViewController:ivc animated:YES completion:nil];

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)

Answer 2

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)

Answer 3

你必须设定预设和过渡风格：

    self.activityAlertVC.modalPresentationStyle = .custom
    self.activityAlertVC.modalTransitionStyle = .crossDissolve

使用淡入动画呈现模态视图

3 个答案: