iOS-使用NSTimer，UIImageView仅在第一时间更新

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当我使用NSTimer完成任务时，遇到了一些问题。我需要一些帮助，谢谢

问题就在这里

当我使用NSTimer在UIImageView上显示动画时。但当我在iphone4s中使用xcode运行代码时，UIImageView只是在第一次更新。当UIImageView再次出现时，它不会更新图像内容。 我已经检查了日志，计时器每次都被调用，代码在运行时被覆盖

NSTimer：

if (networkStatusTimer == nil) {
        networkStatusTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(getcurrentNetworkDelayStatus) userInfo:nil repeats:YES];

networkStatusImageView初始化部分：

- (UIImageView *)networkStatusImageView
{
    if (nil == _networkStatusImageView) {
        CGRect rect = CGRectMake(246, 12, 24, 8);
        _networkStatusImageView = [[UIImageView alloc]initWithFrame:rect];
        _networkStatusImageView.contentMode = UIViewContentModeRight | UIViewContentModeTop;

        UIImageView *img1 = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"talk_icon_redsolid_1X"]];
        UIImageView *img2 = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"talk_icon_redhollow_1x"]];
        UIImageView *img3 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"talk_icon_whitehollow_1x"]];

        img2.left = img1.right;
        img3.left = img2.right;

        [_networkStatusImageView setNeedsDisplay];
        [_networkStatusImageView addSubview:img1];
        [_networkStatusImageView addSubview:img2];
        [_networkStatusImageView addSubview:img3];
    }
    return _networkStatusImageView;
}

选择器代码：

- (void) getcurrentNetworkDelayStatus {
    currentNetworkDelayTime = 0;
    [_networkStatusImageView removeAllSubviews];
    UIImageView *img1 = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"talk_icon_redhollow_1x"]];
    UIImageView *img2 = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"talk_icon_redhollow_1x"]];
    UIImageView *img3 = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"talk_icon_redhollow_1x"]];

    dispatch_async(dispatch_get_main_queue(), ^{
    if (currentNetworkDelayTime == 0) { 
        if (currentISRed) {
            img1.image = [UIImage imageNamed:@"talk_icon_redhollow_1x"];
            img2.image = [UIImage imageNamed:@"talk_icon_redhollow_1x"];
            img3.image = [UIImage imageNamed:@"talk_icon_redhollow_1x"];
        } else {    // 显示红色实心
            img1.image = [UIImage imageNamed:@"talk_icon_redsolid_1X"];
            img2.image = [UIImage imageNamed:@"talk_icon_redsolid_1X"];
            img3.image = [UIImage imageNamed:@"talk_icon_redsolid_1X"];
        }
        currentISRed = !currentISRed;
    } else if(currentNetworkDelayTime > 0 && currentNetworkDelayTime <= 500){ 
        img1 = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"talk_icon_greensolid1X"]];
        img2 = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"talk_icon_greensolid1X"]];
        img3 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"talk_icon_greensolid1X"]];
    } else if(currentNetworkDelayTime > 500 && currentNetworkDelayTime <= 3000){   
        img1 = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"talk_icon_greensolid1X"]];
        img2 = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"talk_icon_greensolid1X"]];
        img3 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"talk_icon_greenhollow_1x"]];
    } else if (currentNetworkDelayTime > 3000){
        img1 = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"talk_icon_greensolid1X"]];
        img2 = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"talk_icon_greenhollow_1x"]];
        img3 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"talk_icon_greenhollow_1x"]];
    }

    img2.left = img1.right;
    img3.left = img2.right;

    [img1 setNeedsDisplay];
    [img2 setNeedsDisplay];
    [img3 setNeedsDisplay];
    [_networkStatusImageView setNeedsDisplay];

    [_networkStatusImageView addSubview:img1];
    [_networkStatusImageView addSubview:img2];
    [_networkStatusImageView addSubview:img3];
    });
}

-（void）getcurrentNetworkDelayStatus{
currentNetworkDelayTime=0；
[_networkstatusimageviewremoveallsubview]；
UIImageView*img1=[[UIImageView alloc]initWithImage:[UIIMAGENAME:@“talk_icon_redhollow_1x”]；
UIImageView*img2=[[UIImageView alloc]initWithImage:[UIIMAGENAME:@“talk_icon_redhollow_1x”]；
UIImageView*img3=[[UIImageView alloc]initWithImage:[UIIMAGENAME:@“talk_icon_redhollow_1x”]；
dispatch\u async（dispatch\u get\u main\u queue（）^{
如果（currentNetworkDelayTime==0）{
如果（当前ISRED）{
img1.image=[UIImage ImageName:@“talk_icon_redhollow_1x”]；
img2.image=[UIImage ImageName:@“talk_icon_redhollow_1x”]；
img3.image=[UIImage ImageName:@“talk_icon_redhollow_1x”]；
}else{//显示红色实心
img1.image=[UIImage ImageName:@“talk_icon_redsolid_1X”]；
img2.image=[UIImage ImageName:@“talk_icon_redsolid_1X”]；
img3.image=[UIImage ImageName:@“talk_icon_redsolid_1X”]；
}
currentISRed=！currentISRed；
}否则如果（currentNetworkDelayTime>0&¤tNetworkDelayTime 500&¤tNetworkDelayTime 3000）{
img1=[[UIImageView alloc]initWithImage:[UIImageName:@“talk_icon_greensolid1X”]；
img2=[[UIImageView alloc]initWithImage:[UIImageName:@“talk_icon_greenhollow_1x”]；
img3=[[UIImageView alloc]initWithImage:[UIImageName:@“talk_icon_greenhollow_1x”]；
}
img2.left=img1.right；
img3.left=img2.right；
[img1设置需要显示]；
[img2设置需要显示]；
[img3设置需要显示]；
[\u网络状态图像视图设置需要显示]；
[\u网络状态图像视图添加子视图：img1]；
[_networkstatusimageviewaddsubview:img2]；
[\u网络状态图像视图添加子视图：img3]；
});
}

每次调用函数时，都将

currentNetworkDelayTime

设置为0。这意味着只有：

if (currentNetworkDelayTime == 0) { 
    if (currentISRed) {
        img1.image = [UIImage imageNamed:@"talk_icon_redhollow_1x"];
        img2.image = [UIImage imageNamed:@"talk_icon_redhollow_1x"];
        img3.image = [UIImage imageNamed:@"talk_icon_redhollow_1x"];
    } else {    // 显示红色实心
        img1.image = [UIImage imageNamed:@"talk_icon_redsolid_1X"];
        img2.image = [UIImage imageNamed:@"talk_icon_redsolid_1X"];
        img3.image = [UIImage imageNamed:@"talk_icon_redsolid_1X"];
    }
    currentISRed = !currentISRed;
}

有人打电话来。因此您需要更改行

currentNetworkDelayTime=0至
currentNetworkDelayTime++

您不必每次都将图像添加到当前的
UIView
，只需在ex.
viewDidLoad
中创建一次图像，并为其创建一个全局变量

完成此操作后，添加此方法以缩短代码：

-(void)changeView:(NSArray *)strArray {
    NSArray *viewArray = [[NSArray alloc] initWithObjects:view1, view2, view3, nil];
    for (int a = 0; 0 < 3; a++) {
        UIImageView *img = viewArray[a];
        img.image = [UIImage imageNamed:strArray[a]];
        [img setNeedsDisplay]; // If you really want to do this.
    }
}

我已经在我的电脑上测试了你的代码，我让它正常工作了

在头文件中：

@property(nonatomic,strong)UIImageView *networkStatusImageView;

在viewDidLoad中：

[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(test) userInfo:Nil repeats:YES];
self.networkStatusImageView = [self networkStatusImageView];
[self.view addSubview:self.networkStatusImageView];

功能网络状态图像视图：

- (UIImageView *)networkStatusImageView
{
if (nil == _networkStatusImageView) {
    CGRect rect = CGRectMake(0, 0, 300, 50);
    _networkStatusImageView = [[UIImageView alloc]initWithFrame:rect];
    _networkStatusImageView.contentMode = UIViewContentModeRight | UIViewContentModeTop;

    for (int a = 0; a < 3; a++) {
    UIImageView *img = [[UIImageView alloc] initWithFrame:CGRectMake(100*a, 0, 100, 50)];
    [img setBackgroundColor:[UIColor blueColor]];
    [_networkStatusImageView addSubview:img];
}
}
return _networkStatusImageView;
}

我使用背景色而不是图像，因为我不想制作用于测试的图像，只需将其更改为
setImage:
，它应该可以工作。
我已经解决了我的问题，解决方案如下：

我仔细检查了问题，并创建了以下三个UIImage字段变量：

@property (nonatomic, weak) UIImage *imgFile1;
@property (nonatomic, weak) UIImage *imgFile2;
@property (nonatomic, weak) UIImage *imgFile3;

并将它们与xib图像资源链接

此功能的实现不好，我计划重新实现
它的下一个版本，有太多的内存分配和释放，一些分配和释放可以删除，使代码更有效率

谢谢所有帮助我的人
 感谢您的帮助，currentNetworkDelayTime由我设置，用于测试以下代码，我知道这一点。我尝试了你的答案，比如changeView方法，但是imageView仍然没有更新。你创建了对象吗？例如，在viewDidLoad中，img=[[UIIMageView alloc]init]；或者在故事板中。我现在看到您没有为图像输入后缀“.jpg”。currentNetworkDelayTime==命名意味着这是网络延迟，与计时器运行的频率无关。关于观点：声音advice@Arbitur是的，我创建了这些对象。顺便说一句，我尝试添加图像文件的扩展名，如“.png”，但仍然不起作用。我想，可能不是后缀的问题。不需要setNeedsDisplay调用可能您的_networkStatusImageView为零最后：为什么调度异步？是的，我也没有看到setNeedsDisplay工作，我将删除setNeedsDisplay调用_networkStatusImageView在之前已初始化，它将不会为零。下面的代码：我想可能是进程同步的问题。所以我添加了dispatch_async来更新主线程中的UI。Arbiutr，谢谢你的帮助，也许有什么不同。我没有将视图放在UIViewController中。我制作了一个定制的UIView并将这些图像放入其中。请参阅。@interface RHCVoIPCardView:UIButtonIt不必仅位于viewDidLoad内，它也可以位于initWithFrame内：。好的，我还有一个问题，当UIView消失时将调用什么？像viewDidUnload一样，当UIViewController消失时会调用它。我已经尝试过你的解决方案，但只是第一次工作，当视图再次出现时，解决方案将不再工作。我认为缓存了一些东西，现在视图实现使用的是ARC。当视图消失时，我只调用[self removeFromSuperView]；恐怕对我来说似乎很深奥。。arc没有发布影响UI的内容：）一定是其他内容
-(void)test {
int currentNetworkDelayTime = 0;
BOOL currentISRed = NO;
NSArray *subViews = [self.networkStatusImageView subviews];
UIImageView *img1 = [subViews objectAtIndex:0];
UIImageView *img2 = [subViews objectAtIndex:1];
UIImageView *img3 = [subViews objectAtIndex:2];
if (currentNetworkDelayTime == 0) {
    if (currentISRed) {
        [img1 setBackgroundColor:[UIColor redColor]];
        [img2 setBackgroundColor:[UIColor redColor]];
        [img3 setBackgroundColor:[UIColor redColor]];
    } else {
        [img1 setBackgroundColor:[UIColor greenColor]];
        [img2 setBackgroundColor:[UIColor greenColor]];
        [img3 setBackgroundColor:[UIColor greenColor]];
    }
}
}

@property (nonatomic, weak) UIImage *imgFile1;
@property (nonatomic, weak) UIImage *imgFile2;
@property (nonatomic, weak) UIImage *imgFile3;