你如何“打乒乓球”？ UIView 图像序列动画

发布于 2024-08-03 19:30:16 字数 672 浏览 1 评论 0原文

我有一个 UIImageView，其中加载了一个 png 图像序列。

我的问题是 - 你知道有什么方法可以“乒乓”动画序列吗？这样它就会从 1-24 向前播放，然后从 24-1 向后播放并循环。

（技术上应该是：1-24 然后 23-1 然后 2-24 然后 23-1...等等）

- (void) loadAnim01 {
mon01 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"mon01_01.png"]];
mon01.center = CGPointMake(258,69);
NSMutableArray *array = [NSMutableArray array];
for (int i = 1; i <= 24; i++) 
    [array addObject:[UIImage imageNamed:[NSString stringWithFormat:@"mon01_%02d.png",i]]];
mon01.animationImages = array;
mon01.animationDuration = 1.0;
mon01.animationRepeatCount = 0;
[self.view addSubview:mon01];
[mon01 release];

}

非常感谢！

原文

I have a UIImageView which has a png image sequence loaded into it.

My question is - Do you know of any way I can "ping pong" the animation sequence?
So that it plays forward from 1-24 then plays backwards from 24-1 and loops.

(technically it should be : 1-24 then 23-1 then 2-24 then 23-1...etc)

- (void) loadAnim01 {
mon01 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"mon01_01.png"]];
mon01.center = CGPointMake(258,69);
NSMutableArray *array = [NSMutableArray array];
for (int i = 1; i <= 24; i++) 
    [array addObject:[UIImage imageNamed:[NSString stringWithFormat:@"mon01_%02d.png",i]]];
mon01.animationImages = array;
mon01.animationDuration = 1.0;
mon01.animationRepeatCount = 0;
[self.view addSubview:mon01];
[mon01 release];

}

Thank a lot!

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套路撩心 2024-08-10 19:30:16

for (int i = 1; i <= 24; i++) {
    [array addObject:[UIImage imageNamed:[NSString stringWithFormat:@"mon01_%02d.png",i]]];
}
for (int j = 23; j >= 2; j--) {
    [array addObject:[array objectAtIndex:j-1]];  // -1 since arrays are 0-based
}

这会以相反的顺序添加除第一个和最后一个动画之外的所有动画的第二个副本，这应该会给您带来乒乓效果。

for (int i = 1; i <= 24; i++) {
    [array addObject:[UIImage imageNamed:[NSString stringWithFormat:@"mon01_%02d.png",i]]];
}
for (int j = 23; j >= 2; j--) {
    [array addObject:[array objectAtIndex:j-1]];  // -1 since arrays are 0-based
}

this adds a second copy of all but the first and last animation, in reverse order, which should give you a ping-pong effect.

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