Objective c UIImageView是否在4.0 SDK中实现了动画化突破？

以下代码在使用iOS 3.x构建时使用。现在有了4.x，它就不起作用了。换句话说，我可以在同一台设备上运行两个相同的应用程序，一个是针对per-4.x版本构建的，另一个是针对4.3版本构建的，在后者中，除非点击屏幕或方向发生变化，否则isAnimating不会改变值

这是相关代码。我从Xcode中基于视图的模板开始

- (void)viewDidLoad {
    [super viewDidLoad];
    iv.animationImages = [NSArray arrayWithObjects:
                                      [UIImage imageNamed:@"timer00.png"],
                                      [UIImage imageNamed:@"timer01.png"],
                                      [UIImage imageNamed:@"timer02.png"],
                                      [UIImage imageNamed:@"timer03.png"],
                                      [UIImage imageNamed:@"timer04.png"],
                                      [UIImage imageNamed:@"timer05.png"],
                                      [UIImage imageNamed:@"timer06.png"],
                                      [UIImage imageNamed:@"timer07.png"],
                                      [UIImage imageNamed:@"timer08.png"],
                                      [UIImage imageNamed:@"timer09.png"],
                                      [UIImage imageNamed:@"timer10.png"],
                                      [UIImage imageNamed:@"timer11.png"],
                                      [UIImage imageNamed:@"timer12.png"],
                                      [UIImage imageNamed:@"timer13.png"],
                                      [UIImage imageNamed:@"timer14.png"],
                                      [UIImage imageNamed:@"timer15.png"],
                                      [UIImage imageNamed:@"timer16.png"],
                                      [UIImage imageNamed:@"timer17.png"],
                                      [UIImage imageNamed:@"timer18.png"],
                                      [UIImage imageNamed:@"timer19.png"],
                                      [UIImage imageNamed:@"timer20.png"],
                                      [UIImage imageNamed:@"timer21.png"],
                                      [UIImage imageNamed:@"timer22.png"],
                                      [UIImage imageNamed:@"timer23.png"],
                                      [UIImage imageNamed:@"timer24.png"],
                                      [UIImage imageNamed:@"timer25.png"],
                                      [UIImage imageNamed:@"timer26.png"],
                                      [UIImage imageNamed:@"timer27.png"],
                                      [UIImage imageNamed:@"timer28.png"],
                                      [UIImage imageNamed:@"timer29.png"],
                                      [UIImage imageNamed:@"timer30.png"],
                                      [UIImage imageNamed:@"timer31.png"],
                                      [UIImage imageNamed:@"timer32.png"],
                                      [UIImage imageNamed:@"timer33.png"],
                                      [UIImage imageNamed:@"timer34.png"],
                                      [UIImage imageNamed:@"timer35.png"],
                                    [UIImage imageNamed:@"timer36.png"],                                      nil];
    iv.animationDuration = 5.0;
    iv.animationRepeatCount = 1;
    [iv startAnimating];
    timer = [NSTimer scheduledTimerWithTimeInterval:0.5 
                                             target:self 
                                           selector:@selector(periodicallyUpdateView) 
                                           userInfo:nil 
                                            repeats:YES];
}

- (void)periodicallyUpdateView {
    if ([iv isAnimating]) {
        NSLog(@"it is animating");
    }
    else {
        NSLog(@"it is NOT animating");
    }
}

---

还有其他人看到了吗？

如果你设置一个计时器，效率会更高。您面临的问题可能不是UIImageView被破坏，而是图像视图加载动画需要很长时间

我推荐这样的东西

NSTimer *imageTimer;

int animationCount;

- (void)startAnimation
{
      imageTimer = [NSTimer scheduledTimerWithTimeInterval:.1 target:self selector:@selector(switchImage) userInfo:nil repeats:YES];
}

- (void)switchImage
{
       NSString *imageName = [NSString stringWithFormat:@"timer%i" , animationCount];
       UIImage *image = [UIImage imageNamed:imageName];
       someImageView.image = image;
 }

---

与问题无关，但很抱歉，这是一个非常糟糕的代码。你应该使用循环来创建数组。我不想弄乱一个可变数组。或者你有别的方法吗？我更喜欢可变数组而不是这个。虽然这是个人的选择。你的代码在iOS 4.2模拟器和4.2.1设备上运行得很好。我刚刚运行了一些测试（将图像减少到三个），看起来至少需要一分钟，有时是预期延迟的4倍，然后isAnimating变为否。如果你没有看到，例如。，如果isAnimating==YES的持续时间正好且仅等于animationDuration*animationRepeatCount，那么？