UIview animatewithDuration不能快速运行 [英] UIview animatewithDuration does not works in swift

问题描述

这似乎是一个非常奇怪的问题.我在storyBoard中有一个小的图像视图，并向其中添加了轻按手势.关于手势的动作，我尝试添加其他图像视图.

This seems to be a very weird issue. I have a small image view in storyBoard and have added tap gesture to it. On the action of gesture I am trying to add a different image view.

目标C代码-

-(void)tapImage{
    bigImageView = [[UIImageView alloc]init];
    [bigImageView setImage:[UIImage imageNamed:@"main.png"]];

    [bigImageView setFrame:CGRectMake(0, 0, 50, 50)];
    [self.view addSubview:bigImageView];


    [UIView animateWithDuration:2.0 delay:2.0 options:UIViewAnimationOptionCurveEaseInOut
                     animations:^(void) {

                         [bigImageView setFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];                         //Leave it empty
                     }
                     completion:^(BOOL finished){

                         // Your code goes here

                     }];

}

完全正常.

快捷代码-

func imageTapped()
{
    println("Tapped on Image")

    bigImageView = UIImageView(frame: CGRectMake(0, 0, 50, 50))
    bigImageView.image = UIImage(named: "main")
    self.view.addSubview(self.bigImageView)


    UIView.animateWithDuration(2.0, delay: 2.0, options:UIViewAnimationOptions.CurveEaseInOut, animations: { () -> Void in
        dispatch_async(dispatch_get_main_queue()) {
            self.bigImageView = UIImageView(frame: CGRectMake(0, 0, 320, 500))
        }

    }) { (completed:Bool) -> Void in

    }
}

不起作用.我不知道我在哪里错. :(

Does not work. I don't know where am I wrong. :(

更新-

首先，我使用"bigimageview.frame"更改框架，现在它正在手势轻击中显示图像视图.但是没有动画.

First I change the frame with "bigimageview.frame" so now it was displaying image view in gesture tap. But without animation.

因此，我在主线程上删除了Dipatch，并且正在制作动画.

So I removed dipatch on main thread and it was animating.

UIView.animateWithDuration(0.4, delay: 0.0, options:UIViewAnimationOptions.CurveEaseInOut, animations: { () -> Void in

//            dispatch_async(dispatch_get_main_queue()) {
                self.bigImageView.frame = CGRectMake(0, 0, 320, 500)
//            }

            }) { (completed:Bool) -> Void in

        } }

但是仍然有疑问为什么会发生.我们是否不应该将UI更改放在闭包/块内的主线程上?请有人解释.

But Still question remains why it happened. Are we not suppose to put UI changes on main thread inside closure/block? Some one please explain.

推荐答案

可能是您的延迟时间和动画时间相同，因此请尝试

Might be your delay and animation time is same so try this

func imageTapped() {
    print("Tapped on Image")

    bigImageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 50, height: 50))
    bigImageView.image = UIImage(named: "main")
    self.view.addSubview(self.bigImageView)


    UIView.animate(withDuration: 2.0, delay: 1.0, options:UIView.AnimationOptions.curveEaseInOut, animations: { () -> Void in
        DispatchQueue.main.async {
            self.bigImageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 320, height: 500))
        }
    }) { (completed:Bool) -> Void in

    }
}

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