UIImageView动画,在最后一帧停止

编辑

比上一种解决方案更好的方法是简单地切换启动和设置的顺序:

[self setImage:[UIImage imageNamed:[NSString stringWithFormat:@"frame-%d_29.png", self.frameSet]]];
[self startAnimating];

经过一番周折之后,我发现,如果将延迟设置为29/30秒(即~0.97秒),NSTimer解决方案实际上可以工作:

- (void)doAnimation
{
    [self setAnimationRepeatCount:1];
    [self setAnimationDuration:1];
    [self startAnimating];
    [NSTimer scheduledTimerWithTimeInterval:0.97f
                                     target:self
                                   selector:@selector(onTimer:)
                                   userInfo:nil
                                    repeats:NO];
}

- (void)onTimer:(NSTimer *)theTimer
{
    [self stopAnimating];
    [self setImage:[UIImage imageNamed:[NSString stringWithFormat:@"frame-%d_29.png", self.frameSet]]];
}