ios - 未调用 animationControllerForPresentedController

Question

我正在尝试创建自定义动画来像在新钱包应用程序中一样转动 Controller 。

我有一个像这样的 ViewController:

@interface ViewController () <UIViewControllerTransitioningDelegate>
@property (nonatomic, strong) UILabel *testLabel;
@property (nonatomic, strong) UIButton *button;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.view.backgroundColor = [UIColor whiteColor];
    self.transitioningDelegate = self;

    _testLabel = [[UILabel alloc] init];
    _testLabel.text = @"View 1";

    [self.view addSubview:_testLabel];



    [_testLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.width.equalTo(self.view);
        make.height.equalTo(@50);
        make.centerX.equalTo(self.view);
        make.top.equalTo(self.mas_topLayoutGuide);
    }];

    _button = [[UIButton alloc] init];
    [_button addTarget:self action:@selector(push)forControlEvents:UIControlEventTouchUpInside];
    [_button setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    [_button setTitle:@"Show View" forState:UIControlStateNormal];
    [self.view addSubview:_button];

    [_button mas_makeConstraints:^(MASConstraintMaker *make) {
        make.center.equalTo(self.view);
        make.width.and.height.equalTo(@50);
    }];
}

- (void)push {
    NSLog(@"Push controller");
    BackViewController *vc = [[BackViewController alloc] init];
    [self.navigationController presentViewController:vc animated:YES completion:nil];
}

-(id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source {
    TurnAnimationController *an = [[TurnAnimationController alloc] init];
    an.flipDirection = CEDirectionHorizontal;
    return an;
}

animationControllerForPresentedController 方法从未被调用，所以我的动画永远不会被执行。我没有看到问题？我要将 transitioningDelegate 设置为 self？

有什么想法吗？

Answer 1

调用 animationControllerForPresentedController 的另一个要求是将 true 作为 presentViewController:animated:completion 中的 animated 参数传递>

如果你打电话


presentViewController(myVC，动画:假，完成:无)


那么即使您设置了 transitioningDelegate，也不会调用 animationControllerForPresentedController。