Question

我想在特定时间内制作动画。我的代码如下：

- (void)animate{

NSArray *myImages = [[NSArray alloc] initWithObjects:
                     [UIImage imageNamed:@"01.png"],
                     [UIImage imageNamed:@"02.png"],
                     [UIImage imageNamed:@"03.png"],
                     [UIImage imageNamed:@"04.png"],
                     [UIImage imageNamed:@"05.png"],
                     [UIImage imageNamed:@"06.png"],
                     [UIImage imageNamed:@"07.png"],
                     [UIImage imageNamed:@"08.png"],
                     [UIImage imageNamed:@"09.png"],
                     [UIImage imageNamed:@"10.png"],
                     [UIImage imageNamed:@"11.png"],
                     [UIImage imageNamed:@"12.png"],
                     [UIImage imageNamed:@"13.png"],
                     nil];


faceImage.animationImages = myImages;
faceImage.animationDuration = 4.0;
faceImage.animationRepeatCount = 4;

[faceImage startAnimating];

}

现在的问题是在播放animationDuration之后，animationRepeatCount会持续几秒钟！但我想在4秒内制作我的animationRepeatCount。 4秒后我的动画应该停止！我正在做我的代码有什么问题？或者，我该如何解决这个问题？

Answer 1

在继续之前，您需要了解以下内容：

animationDuration; //一个周期的图像。默认值是图像数量* 1/30秒（即30 fps）

这意味着您设置的动画持续时间是针对一个图像循环。所以现在如果你想在4秒内重复动画4次。设置animationDuration 1秒。

如果需要，您也可以在任何情况下手动stopAnimating;

Answer 2

您的准则应该是：

- (void)animate
{
   NSArray *myImages = [[NSArray alloc] initWithObjects:
                     [UIImage imageNamed:@"01.png"],
                     [UIImage imageNamed:@"02.png"],
                     [UIImage imageNamed:@"03.png"],
                     [UIImage imageNamed:@"04.png"],
                     [UIImage imageNamed:@"05.png"],
                     [UIImage imageNamed:@"06.png"],
                     [UIImage imageNamed:@"07.png"],
                     [UIImage imageNamed:@"08.png"],
                     [UIImage imageNamed:@"09.png"],
                     [UIImage imageNamed:@"10.png"],
                     [UIImage imageNamed:@"11.png"],
                     [UIImage imageNamed:@"12.png"],
                     [UIImage imageNamed:@"13.png"],
                     nil];


   faceImage.animationImages = myImages;
   faceImage.animationDuration = 1.0;
   faceImage.animationRepeatCount = 4;

   [faceImage startAnimating];
}

Answer 3

首先用以下内容替换你糟糕的数组初始化：

int imageCount = ...;
int *longestStringLength = [NSString stringWithFormat:@"%d", imageCount - 1].length;
NSMutableArray *myImages = [[NSMutableArray alloc] init];
for (int i = 0; i < imageCount; i++) {

    NSString *filename = [NSString stringWithFormat:@"%d", i];
    while(filename.length < longestStringLength) {

        filename = [NSString stringWithFormat:@"0%@", filename];
    }
    filename = [filename stringByAppendingString:@".png"];
    [myImages addObject:[UIImage imageNamed:filename]];
}

对于第二个，检查当前的动画持续时间，如果有必要，将其变量除以4.

动画播放后，动画继续播放

3 个答案: