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标题: iphone - 如何在 ScrollView 图像中添加背景图像 [打印本页]

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作者: 菜鸟教程小白    时间: 2022-12-13 10:06
标题: iphone - 如何在 ScrollView 图像中添加背景图像

我想为 ScrollView 中的每个图像添加背景图像 bgImageView.image = [UIImage imageNamed"frame_trans"];，但是 ScrollView 扩展而不是添加图像每张图片背后，我做错了什么？

编辑:添加了工作代码，感谢 ColdLogic。

这是我的旧 ScrollView

我想添加回形针

但当前代码会这样做。

代码:

//init scrollview in location on screen
//scrollview = [[UIScrollView alloc] initWithFrame:CGRectMake(30, 100, 278, 290)];   
//scrollview.backgroundColor = [UIColor redColor];
//pass image filenames
NSMutableArray *fileNames = Info.imageFiles; //[[[NSMutableArray alloc] init] autorelease];
//setup the array of uiimageviews
NSMutableArray *imgArray = [[NSMutableArray alloc] init];
NSMutableArray *bgImgArray = [[NSMutableArray alloc] init];       
//loop through the array imgNames to add file names to imgArray
for (NSString *imageName in fileNames) {
    NSString *tempIMGName = [NSString stringWithFormat"data/%i/%@",Info.ID, imageName];
    NSLog(@"tempIMG %@",tempIMGName);
    UIImageView *imageView = [[UIImageView alloc] init];
    UIImageView *bgImageView = [[UIImageView alloc] init];;
    imageView.image = [UIImage imageNamed:tempIMGName];
    bgImageView.image = [UIImage imageNamed"frame_trans"];
    imageView.contentMode = UIViewContentModeScaleAspectFit;
    CGAffineTransform newTransform = CGAffineTransformMakeRotation((CGFloat)(-3 * M_PI / 180.0));
    imageView.layer.affineTransform = newTransform;//CGAffineTransformMakeRotation(degreesToRadians(10));
    [imgArray addObject:imageView];
    [bgImgArray addObject:bgImageView];
    [imageView release];
    [bgImageView release];
}

CGSize pageSize = scrollview.frame.size; 

NSUInteger page = 0;

for (UIView *bgViewForScrollView in bgImgArray) {

    [scrollview addSubview:bgViewForScrollView];

    bgViewForScrollView.frame = CGRectMake(pageSize.width * page++ +10, 0, pageSize.width -20 , pageSize.height);


    // making use of the scrollView's frame size (pageSize) so we need to;
    // +10 to left offset of image pos (1/2 the gap)
    // -20 for UIImageView's width (to leave 10 gap at left and right)

}

NSUInteger page1 = 0;
for (UIView *viewForScrollView in imgArray) {

    [scrollview addSubview:viewForScrollView];
    viewForScrollView.frame = CGRectMake(pageSize.width * page1++ +10, 0, pageSize.width -20 , pageSize.height);

    // making use of the scrollView's frame size (pageSize) so we need to;
    // +10 to left offset of image pos (1/2 the gap)
    // -20 for UIImageView's width (to leave 10 gap at left and right)
}

//add scroll view to view
[self.view addSubview:scrollview];
[self.view bringSubviewToFront:scrollview];
scrollview.contentSize = CGSizeMake(pageSize.width * [imgArray count], pageSize.height);

//scrollview.contentSize = CGSizeMake(320 *viewcount + 20, 290 );
scrollview.showsHorizontalScrollIndicator =NO;
[scrollview setPagingEnabled:YES];
scrollview.delegate =self;

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Best Answer-推荐答案

问题是您在为背景 View 创建框架时使用 page++，然后在开始为图像创建框架时没有重置它。 page 将有一个值 3 进入 imgArray 的 for 循环，使其位于第 4 个索引处。

for (UIView *bgViewForScrollView in bgImgArray) {
    //code
}

//ADD THIS LINE OF CODE
page = 0;

for (UIView *viewForScrollView in imgArray) {
    //Code
}

关于iphone - 如何在 ScrollView 图像中添加背景图像，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/8359253/

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