Question

我在项目中使用了slider from this。

在此滑块中，他们使用静态图像传递到滑块，这些图像在滑块中可见。但我有来自服务的图像数组，我将此数组传递给滑块，滑块工作正常，但它不会在滑块中显示图像。我很困惑，为什么它没有显示它。我的滑块代码是，

 NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSArray *arrayOfImages = [userDefaults objectForKey:@"property_images"];
NSLog(@"GGG %@",arrayOfImages);


//self.imagesData=[[NSArray alloc]init];
self.imagesData = arrayOfImages;  //[_Image1 mutableCopy];  //@[@"image1.jpg", @"image2.jpg", @"image3.jpg"];
NSLog(@"Image Array is %@",_imagesData);
for(int i=0; i<self.imagesData.count;i++){
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(CGRectGetWidth(self.view.frame) * i, 0, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.scrollView.frame))];
    imageView.contentMode = UIViewContentModeScaleAspectFill;
    imageView.image = [UIImage imageNamed:[self.imagesData objectAtIndex:i]];
    [self.scrollView addSubview:imageView];
}
self.scrollView.delegate = self;
index=0;


// Progammatically init a TAPageControl with a custom dot view.
self.customPageControl2 = [[TAPageControl alloc] initWithFrame:CGRectMake(20,self.scrollView.frame.origin.y+self.scrollView.frame.size.height,self.scrollView.frame.size.width,40)];//CGRectMake(0, CGRectGetMaxY(self.scrollView.frame) - 100, CGRectGetWidth(self.scrollView.frame), 40)
// Example for touch bullet event
self.customPageControl2.delegate      = self;
self.customPageControl2.numberOfPages = self.imagesData.count;
self.customPageControl2.dotSize       = CGSizeMake(20, 20);
self.scrollView.contentSize = CGSizeMake(CGRectGetWidth(self.view.frame) * self.imagesData.count, CGRectGetHeight(self.scrollView.frame));
[self.view addSubview:self.customPageControl2];

滑块的其他功能就是这个，

-(void)viewDidAppear:(BOOL)animated{
        timer=[NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(runImages) userInfo:nil repeats:YES];
  }

-(void)viewDidDisappear:(BOOL)animated{
    if (timer) {
        [timer invalidate];
        timer=nil;
    }
}



 -(void)runImages{
        self.customPageControl2.currentPage=index;
        if (index==self.imagesData.count-1) {
            index=0;
        }else{
            index++;
        }
        [self TAPageControl:self.customPageControl2 didSelectPageAtIndex:index];
    }

        - (void)viewDidLayoutSubviews
    {
        [super viewDidLayoutSubviews];


    }

        - (void)scrollViewDidScroll:(UIScrollView *)scrollView
    {
        NSInteger pageIndex = scrollView.contentOffset.x / CGRectGetWidth(scrollView.frame);
        self.customPageControl2.currentPage = pageIndex;
        index=pageIndex;
    }
    // Example of use of delegate for second scroll view to respond to bullet touch event
    - (void)TAPageControl:(TAPageControl *)pageControl didSelectPageAtIndex:

        (NSInteger)currentIndex
    {
        index=currentIndex;
        [self.scrollView scrollRectToVisible:CGRectMake(CGRectGetWidth(self.view.frame) * currentIndex, 0, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.scrollView.frame)) animated:YES];
    }

Answer 1

尝试使用SDWebImage Library从服务器下载图像。

目标-C：

  for(int i=0; i<self.imagesData.count;i++){
        UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(CGRectGetWidth(self.view.frame) * i, 0, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.scrollView.frame))];
        imageView.contentMode = UIViewContentModeScaleAspectFill;
       [imageView sd_setImageWithURL:[NSURL URLWithString:[self.imagesData objectAtIndex:i]
        placeholderImage:[UIImage imageNamed:@"placeholder.png"]];    
       [self.scrollView addSubview:imageView];
    }

整个代码

{{1}}

SDWebImage Source

Answer 2

这是scrollView的基本设置：

//data
NSArray * imageArray = @[@"a.jpg",@"b.jpg",@"c.jpg"];

//view
UIScrollView * scrollView = [UIScrollView new];
scrollView.frame = CGRectMake(0, 0, 320, 200);
[self.view addSubview:scrollView];

//add in
float x = 0;
float imageWidth = 320;
for (int n = 0; n < imageArray.count; n++){

    UIImageView * iv = [UIImageView new];
    iv.frame = CGRectMake(x, 0, imageWidth, 200);
    iv.image = [UIImage imageNamed:imageArray[n]];
    iv.contentMode = UIViewContentModeScaleAspectFill;
    iv.clipsToBounds = true;
    [scrollView addSubview:iv];

    x+=imageWidth;
}

//update content size
scrollView.contentSize = CGSizeMake(x, 200);

在IOS中将图像数组加载到滑块中

2 个答案: