UIPopoverPresentationController淡入

Question

在我的iOS8+项目中，我使用UIPopoverPresentationController表示一个UIViewController：

vc.modalPresentationStyle = UIModalPresentationPopover;
vc.popoverPresentationController.delegate = self;
vc.popoverPresentationController.sourceView = self.someView.superview;
vc.popoverPresentationController.sourceRect = self.someView.frame;
vc.popoverPresentationController.backgroundColor = [UIColor clearColor];
vc.popoverPresentationController.permittedArrowDirections = UIPopoverArrowDirectionUp | UIPopoverArrowDirectionDown;
vc.preferredContentSize = CGSizeMake(200, 500);

(还实现委托方法以强制作为popover)

-(UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller
{
    return UIModalPresentationNone;
}

目前，它在呈现的UIViewController上立即出现(并且随着淡出而消失)。有人能告诉我如何定制这个演示文稿，这样我就可以让它褪色吗？

Answer 1

我能够做到这一点，只需设置：

[self.view setAlpha: 0.0];
[self.popoverPresentationController.containerView setAlpha:0.0];

在popover的viewWillAppear:方法中，然后调用

[UIView animateWithDuration:0.25 delay:0.0 options:UIViewAnimationOptionBeginFromCurrentState animations:^{

    [self.view setAlpha:1.0];
    [self.popoverPresentationController.containerView setAlpha:1.0];

} completion:nil];

在viewDidAppear:方法中。

Answer 2

这是我的建议：

 - (void)showRight:(NSString*)title{
    UIButton *rightBtn=[UIButton buttonWithType:UIButtonTypeCustom];
    rightBtn.exclusiveTouch = YES;
    rightBtn.frame=CGRectMake(0, 0, 70, 44);
    rightBtn.titleLabel.font=[UIFont systemFontOfSize:15];
    [rightBtn setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
    [rightBtn setTitle:title forState:UIControlStateNormal];
    rightBtn.contentHorizontalAlignment=UIControlContentHorizontalAlignmentRight;
    [rightBtn addTarget:self action:@selector(onClickRight:) forControlEvents:UIControlEventTouchUpInside];

    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:rightBtn];


}


-(void)onClickRight:(UIButton *)bar{

    NSLog(@"bubble");
    POPViewController *popVC = [[POPViewController alloc] init];

    UINavigationController *destNav = [[UINavigationController alloc] initWithRootViewController:popVC];/*-> Here popVC is a controller you want to show in popoverview *******/
    popVC.preferredContentSize = CGSizeMake(280,200);
    destNav.modalPresentationStyle = UIModalPresentationPopover;
    _dateTimePopover8 = destNav.popoverPresentationController;
    _dateTimePopover8.delegate = self;
    _dateTimePopover8.sourceView = self.view;
//    _dateTimePopover8.sourceRect = CGRectMake(0, 64, 70, 44);// CGRectMake(SCREEN_W-20, 64, 70, 44);;//->Here  Rect  is you want show position


    // ->here I got  the rightBarButtonItem position and  show
    CGRect frame = [[self.navigationItem.rightBarButtonItem valueForKey:@"view"] frame];
    frame.origin.y = frame.origin.y+10;
    frame.origin.x = frame.origin.x+15;
    _dateTimePopover8.sourceRect = frame;


    destNav.navigationBarHidden = YES;
    [self presentViewController:destNav animated:YES completion:nil];
}

- (UIModalPresentationStyle) adaptivePresentationStyleForPresentationController: (UIPresentationController * ) controller {
    return UIModalPresentationNone;
}

-(void)hideIOS8PopOver
{
    [self dismissViewControllerAnimated:YES completion:nil];
}

我希望我能帮你！