objective-c - 动画没有通过另一个 View Controller 执行

Question

我正在尝试根据单独的类文件中发生的情况在一个 View 中触发动画。它得到了方法，它确实吐出了两个 NSLog 语句，但没有提交 UIView Animation

代码如下:

ViewController.h

@interface ViewController : UIViewController {

}

-(void)closeMenu;

ViewController.m

-(void)closeMenu{

    //close the menu
    NSLog(@"Got here");

    [UIView animateWithDuration:0.6 animations:^{

        [UIView setAnimationBeginsFromCurrentState:YES]; // so it doesn't cut randomly, begins from where it is

        [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];

        [menuView setFrame:CGRectMake(menuView.frame.origin.x, -menuView.frame.size.height, menuView.frame.size.width, menuView.frame.size.height)];

    }];


    NSLog(@"Got here2");

}

OtherClass.m(注释代码可能与本题无关，当然在实际应用中还是会用到，只是觉得这样可能更容易理解)

#import "ViewController.h"

...

//- (void) item:(SDGroupCell *)item subItemDidChange:(SDSelectableCell *)subItem
//{
    ViewController *foo = [[[ViewController alloc] init] autorelease];

    //SelectableCellState state = subItem.selectableCellState;
    //NSIndexPath *indexPath = [item.subTable indexPathForCell:subItem];
    //switch (state) {
        //case Checked:
            //NSLog(@"Changed Sub Item at indexPath:%@ to state \"Checked\"", indexPath);

            //close the menuView

            [foo closeMenu];

            //break;
        //case Unchecked:
            //NSLog(@"Changed Sub Item at indexPath:%@ to state \"Unchecked\"", indexPath);
            //break;
        //default:
            //break;
    //}
}

Answer 1

您将老式动画与基于 block 的动画混合在一起。例如，在文档中，它声明为 setAnimationBeginsFromCurrentState :

Use of this method is discouraged in iOS 4.0 and later. Instead, you should use theanimateWithDuration:delay:options:animations:completion: method to specify your animations and the animation options.

我不是 100% 确定这是否受支持。您至少应该将动画代码更改为:

[UIView animateWithDuration:0.6
                      delay:0.0
                    options:UIViewAnimationOptionBeginFromCurrentState|UIViewAnimationOptionCurveEaseInOut  
                 animations:^{
    [menuView setFrame:CGRectMake(menuView.frame.origin.x, -menuView.frame.size.height, menuView.frame.size.width, menuView.frame.size.height)];

                            }
                 completion:nil];

除此之外，它似乎应该有效。如果影响框架，它可能会导致其他问题。在动画 block 之前计算帧可能是值得的。阿拉:

CGRect newFrame = CGRectMake(menuView.frame.origin.x, -menuView.frame.size.height, menuView.frame.size.width, menuView.frame.size.height)

[UIView animateWithDuration...:^{ menuView.frame = newFrame; }...];

编辑:哦等等，看起来您正在分配/初始化 (void) item:(SDGroupCell *)item subItemDidChange:(SDSelectableCell *)subItem 中的对象，并在其上调用方法，但 View 在 View 层次结构中无处可寻。您需要在屏幕上显示的实例上调用动画。希望这是有道理的？

编辑 2: 要在已显示的实例上调用它，通常您需要将其存储在实例变量中。我不能确切地说出你的情况，但通常是这样的形式:

@interface OtherClass () {
    ViewController* m_viewController;
}
@end

....

- (void)viewDidLoad // Or where ever you first create your view controller
{
    ...
    // If you're adding a ViewController within another ViewController, you probably need View Controller Containment
    m_viewController = [[ViewController alloc] init];
    [self addChildViewController:m_viewController];
    [m_viewController didMoveToParentViewController:self];
    [self.view addSubview:m_viewController.view];
    ...
}

// If you're using ARC code, the dealloc wouldn't typically be necessary
- (void)dealloc
{
    [m_viewController release];
    [super dealloc];
}

//- (void) item:(SDGroupCell *)item subItemDidChange:(SDSelectableCell *)subItem
//{
    //SelectableCellState state = subItem.selectableCellState;
    //NSIndexPath *indexPath = [item.subTable indexPathForCell:subItem];
    //switch (state) {
        //case Checked:
            //NSLog(@"Changed Sub Item at indexPath:%@ to state \"Checked\"", indexPath);

            //close the menuView

            [m_viewController closeMenu];

            //break;
        //case Unchecked:
            //NSLog(@"Changed Sub Item at indexPath:%@ to state \"Unchecked\"", indexPath);
            //break;
        //default:
            //break;
    //}
    }

如果您需要从类外部访问它，这还不够，请为此使用属性。即

头文件

@property (nonatomic, strong) ViewController* myViewController

.m 文件

// Use it as such
[self.myViewController closeMenu];