Question

我想在iOS 8中制作自定义键盘。我希望在手机旋转到横向模式时更改它的大小。

-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation 
duration:(NSTimeInterval)duration
{
    NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
    if ((toInterfaceOrientation==UIInterfaceOrientationPortrait) || (toInterfaceOrientation==UIInterfaceOrientationPortrait))
    {
        [def setObject:@"No" forKey:@"LandScape"];
        [def synchronize];
        islandscapemode = NO;
        NSLayoutConstraint *_heightConstraint =
        [NSLayoutConstraint constraintWithItem: self.view
                                     attribute: NSLayoutAttributeHeight
                                     relatedBy: NSLayoutRelationEqual
                                        toItem: nil
                                     attribute: NSLayoutAttributeNotAnAttribute
                                    multiplier: 0.0
                                      constant: 266];

        [self.view addConstraint:_heightConstraint];
           }
    else
    {
        [def setObject:@"Yes" forKey:@"LandScape"];
        [def synchronize];

        NSLayoutConstraint *_heightConstraint =
        [NSLayoutConstraint constraintWithItem: self.view
                                     attribute: NSLayoutAttributeHeight
                                     relatedBy: NSLayoutRelationEqual
                                        toItem: nil
                                     attribute: NSLayoutAttributeNotAnAttribute
                                    multiplier: 0.0
                                      constant: 266];

        [self.view addConstraint:_heightConstraint];

        self.view.backgroundColor=[UIColor greenColor];

        islandscapemode = YES;

    }
    //  [self determineKeyboardNib:toInterfaceOrientation];
}

但它不起作用。我该怎么办？

Answer 1

willRotateToInterfaceOrientation:duration:

在iOS 8中已弃用。请尝试使用

viewWillTransitionToSize:withTransitionCoordinator:

iOS Developer Library: viewWillTransitionToSize

此函数提供对容器视图的新大小和转换协调器的引用。然后，您可以将键盘大小调整为新的屏幕大小。

还有一个附加到转换协调器的功能，允许您在屏幕旋转时为视图设置动画和/或在屏幕旋转后完成功能块。

iOS Developer Library: UIViewControllerTransitionCoordinator

animateAlongsideTransition:completion:

和

animateAlongsideTransitionInView:animation:completion:

至于你原来的问题，在设置约束后你是否尝试在视图上调用layoutIfNeeded？

iOS 8横向纵向模式下的自定义键盘

1 个答案: