ios - 使用 NSTimer 切换图像

Question

我有几张图片想切换。我为此做了一个简单的功能:

-(void)imageSlide{

if (!isMoved){
CGRect frame = self.imageSlideshow.frame;
frame.origin.x = self.imageSlideshow.frame.origin.x - 320;
self.imageSlideshow.frame = frame;
NSLog(@"1 caze work");
isMoved = YES;
}

if (isMoved){
CGRect frame = self.imageSlideshow.frame;
frame.origin.x = self.imageSlideshow.frame.origin.x + 320;
self.imageSlideshow.frame = frame;
NSLog(@"2 caze work");
isMoved = NO;
}
}

有调用该函数的 NSTimer:

[NSTimer scheduledTimerWithTimeInterval:2.0
                                         target:self
                                       selector:@selector(imageSlide)
                                       userInfo:nil
                                        repeats:YES];

BOOL isMoved; 放置在类的实现中。

我想要的是删除图像，然后再次显示(每 2 秒重复一次)。如果能有流畅的动画效果就好了。

那个代码:

for (int i=0; i<99; i++){

        self.imageSlideshow.image = [UIImage imageNamed:(i % 2) ? @"ipd1.jpg" : @"ipd2.jpg"];

        CATransition *transition = [CATransition animation];
        transition.duration = 1.0f;
        transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
        transition.type = kCATransitionFade;

        [self.imageSlideshow.layer addAnimation:transition forKey:nil];
    }

也不起作用，不知道为什么。图像静止。我确实导入了 quartz 库并包含了标题。

Answer 1

您可以使用以下代码实现此目的:-

#import <QuartzCore/QuartzCore.h>
...
imageView.image = [UIImage imageNamed:(i % 2) ? @"3.jpg" : @"4.jpg"];

CATransition *transition = [CATransition animation];
transition.duration = 2.0f;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionFade;

[imageView.layer addAnimation:transition forKey:nil];

而 NSTimer Job 应该在这里通过 transition.duration 来完成。所以，这里不再需要 NSTimer。

礼貌:- https://stackoverflow.com/a/2834693/1865424

这段代码也可以:-

 // create the view that will execute our animation
 UIImageView* imageSlideshow = [[UIImageView alloc] initWithFrame:self.view.frame];

 // load all the frames of our animation
 imageSlideshow.animationImages = [NSArray arrayWithObjects:    
                             [UIImage imageNamed:@“ipd1.jpg"],
                             [UIImage imageNamed:@“ipd2.jpg"], nil];

 // all frames will execute in 1.75 seconds
 imageSlideshow.animationDuration = 1.75;
 // repeat the animation forever
 imageSlideshow.animationRepeatCount = 0;
 // start animating
 [imageSlideshow startAnimating];
 // add the animation view to the main window 
 [self.view addSubview:imageSlideshow];