Question

我有一个简单的动画运行，它以相机视图为背景上下移动。我试图以随机速率生成更多动画。这可能吗？

我正在通过UIView startAnimation运行我的动画。

NSArray *myImages = [NSArray arrayWithObjects:
                             [UIImage imageNamed:@"enemyball.png"],
                             [UIImage imageNamed:@"playerball.png"]
                             , nil];

        //animation of images
        UIImageView *animatedView =[UIImageView alloc];
        [animatedView initWithFrame:[self bounds]];
        animatedView.animationImages = myImages;
        animatedView.animationDuration = 0.25; // seconds
        animatedView.animationRepeatCount = 0; //0 loops for ever/noted
        [animatedView startAnimating];
        [self addSubview:animatedView];

        //animation movement
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:1];
        [UIView setAnimationCurve:1];

        [UIView setAnimationRepeatCount:INFINITY];
        [UIView setAnimationRepeatAutoreverses:YES];
        [UIView setAnimationBeginsFromCurrentState:YES];

        CGAffineTransform transform = CGAffineTransformMakeTranslation(220, 330);
        animatedView.transform = transform;

        [UIView commitAnimations];

这是我想在相机视图中显示的叠加层。

- (void) viewDidAppear:(BOOL)animated {

    enemyBall *overlay = [[enemyBall alloc] initWithFrame:CGRectMake(20, 20, 50, 50)];

    //OverlayView *overlay = [[OverlayView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGTH)];

    // Create a new image picker instance:
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];

    // Set the image picker source:
    picker.sourceType = UIImagePickerControllerSourceTypeCamera;

    // Hide the controls:
    picker.showsCameraControls = NO;
    picker.navigationBarHidden = YES;

    // Make camera view full screen:
    picker.wantsFullScreenLayout = YES;
    picker.cameraViewTransform = CGAffineTransformScale(picker.cameraViewTransform, CAMERA_TRANSFORM_X, CAMERA_TRANSFORM_Y);

    // Insert the overlay:
    //picker.cameraOverlayView = overlay;
    picker.cameraOverlayView = overlay;

    // Show the picker:
    [self presentModalViewController:picker animated:YES];  

    [super viewDidAppear:YES];
}

我试图让我的动画以随机顺序和时间生成，但放置另一组数组代码似乎太多了，我不能有第二个叠加，因为它不会读取第二个叠加层。这可能吗？

如何使用NSTimer随机显示图像？

0 个答案: