Question

对目标C和SOS发展(来自PHP)来说,是一个比较简单的问题,我似乎无法找到答案:

我也看到了一个分裂的例子。浏览设计,如果一个用户在主意中点击某一项目时将网页装入《详细观点》。我全力以赴,但愿以网络观点取代形象。因此,我修改了装上UIImage的电灯,而不是装上网上电文。我所期望的是,这相当于这一法典:

NSString *urlString = [pagesAddress objectAtIndex:indexPath.row];
NSURL *url = [NSURL URLWithString:urlString];

// these 2 is where I get lost with the images.
NSURLRequest = *request = [NSURLRequest requestWithURL:url];
[detailViewController.webView loadRequest:request];

我来到这里:

NSString *imageName = [pagesAddress objectAtIndex:indexPath.row];
UIImage *myImage = [UIImage imageNamed:imageName];

// missing the last 2 calls: one to tell Xcode that it s an image "request" I want and the second to load the actual image (based on it s name that is already in an array) into the ImageView.

感谢。

PS

我试图这样做:

NSString *imageName = [pagesAddress objectAtIndex:indexPath .row];
[detailViewController.imageView setImage:[UIImage imageNamed:imageName]];

这只是第一个形象,然后在我试图显示最后一个形象时坠毁。

Answer 1

最后,在我修改法典时,解决办法是这两行:

NSString *imageName = [pagesAddress objectAtIndex:indexPath.row];
[detailViewController.imageView setImage:[UIImage imageNamed:imageName]];

通知说,我不得不改变把国家安全局改成统一分类或X代码的定点。飞机倒塌的原因是,在我有图像名称的阵列中,我把3个图像放入一个条目(主要是我忘了 com!)这样,它就已经消失了。

时间:

你给我的信

UIImageView *imageView = [[UIImageView alloc] initWithFrame:self.view.bounds];

is unnecessary because I already have a view created, it would create another view which I never used. Also, replacing it with CGRect seems overkill if I already have a UIImage placeholder no?

无论如何,它现在运作,我非常感谢所有帮助。带有目标C的iPad发育是一条非常棘手的道路,我期望我会把更多的东西.在你们身上。

乘客。

Answer 2

为此:

UIImage *myImage = [[UIImage alloc] initWithData:[NSData dataWithConentsOfURL:[NSURL URLWithString:urlString];
// don t know if you already got the following?
UIImageView *imageView = [[UIImageView alloc] initWithFrame:self.view.bounds];
[imageView setImage:myImage];
[self.view addSubview:imageView];

第1行是同步的(=阻塞),因此,在生产过程中,你应当为此使用<代码>-[NSURLRequeststart](但这一条更为复杂)。

或利用这些图像拍摄当地形象:

UIImage *myImage = [UIImage imageNamed:imageName];
// Now, follow the same steps as in the first code-example, just skip the first line.

Answer 3

引申(关于4.0和之后):

// Execute a block of code on a background thread.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),
               ^(void) 
{
    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
    UIImage* image = [UIImage imageWithData:[NSData dataWithContentsOfURL:url]];
    // When IO is done and image created, set it on the main thread.
    dispatch_async(dispatch_get_main_queue(), 
                   ^(void) 
    {
        imageView.image = image;
    });
    [pool release];
});

友情链接