Question

我想制作一个类似于Facebook在其应用程序的早期版本中使用的动画，其中标题出现在中心，在1或2秒后它会上升几个像素，因此有一些空间可用于登录或什么，问题是动画不能像我想的那样工作，我留下我的代码，所以你可以看到什么错误....谢谢！

- (void)viewDidLoad
{

    self.view.backgroundColor = [UIColor colorWithRed:51/255.0f green:204/255.0f blue:102/255.0f alpha:1.0];
    self.LogoImageView.center = self.view.center;

    if ([[UIScreen mainScreen] bounds].size.height == 568)
    {
        //IPHONE 4 i

        self.LogoImageView.frame = CGRectMake(33, 156, 255, 255);

    }else
    {
        //IPHONE 3.5 i

         self.LogoImageView.frame = CGRectMake(33, 112, 255, 255);
    }

    double delayInSeconds = 2.0;
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
        [UIView animateWithDuration:1.0 delay:.35 usingSpringWithDamping:.10 initialSpringVelocity:.50 options:UIViewAnimationOptionCurveEaseInOut animations:^{

            if ([[UIScreen mainScreen] bounds].size.height == 568)
            {
                //iphone 5 image

                self.LogoImageView.frame = CGRectMake(33, 48, 200 , 200);

            }else
            {
                self.LogoImageView.frame = CGRectMake(33, 48, 200, 200);
            }




        } completion:nil];
    });






    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

Answer 1

尝试在动画之前调用[super viewDidLoad] 。我怀疑在动画制作时LogoImageView尚未初始化。

我不知道你是否也注意到了，但你在动画中设置的框架对于两种屏幕尺寸看起来都是一样的

- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. self.view.backgroundColor = [UIColor colorWithRed:51/255.0f green:204/255.0f blue:102/255.0f alpha:1.0]; // You can remove this line since you're already setting // the origin position right after. // // self.LogoImageView.center = self.view.center; BOOL isFourInchesScreen = [[UIScreen mainScreen] bounds].size.height == 568; if (isFourInchesScreen) { // IPHONE 4 i // self.LogoImageView.frame = CGRectMake(33, 156, 255, 255); } else { // iPhone 3.5 i // self.LogoImageView.frame = CGRectMake(33, 112, 255, 255); } [UIView animateWithDuration:1.0 delay:2.35f usingSpringWithDamping:.10 initialSpringVelocity:.50 options:UIViewAnimationOptionCurveEaseInOut animations:^{ self.LogoImageView.frame = CGRectMake(33, 48, 200, 200); } completion:nil]; }

您也可以删除dispatch_after，因为动画方法上有延迟参数。

希望有所帮助。

我的调度动画不能像我想的那样工作？ iOS版

1 个答案: