iOS网络加载启动图

最新推荐文章于 2025-06-10 15:02:39 发布

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最新推荐文章于 2025-06-10 15:02:39 发布

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本文链接：https://blog.youkuaiyun.com/sinat_35710100/article/details/52046366

本文介绍了如何在iOS应用中实现网络加载启动图。首先从LaunchScreen.storyboard中获取UIViewController，添加UIImageView并设置图片。根据默认存储的数据加载图片，若无则显示默认图片。接着使用AFNetworking下载图片，并保存到文档目录。最后，通过UIView动画实现3D过渡效果，并在动画完成后发起网络请求加载广告页面图片。

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// 这一步是获取 LaunchScreen.storyboard 里的 UIViewController,UIViewController 的 identifer 是 LaunchScreen
    UIViewController *viewController = [[ UIStoryboard storyboardWithName : @"LaunchScreen" bundle :[ NSBundle mainBundle ]] instantiateViewControllerWithIdentifier : @"LaunchScreen" ];
    UIView *launchView = viewController. view ;
    UIImageView * Imageview= [[ UIImageView alloc ] initWithFrame :[ UIScreen mainScreen ]. bounds ];
    [launchView addSubview :Imageview];
    [ self . view addSubview :launchView];

    // 这一步是获取上次网络请求下来的图片，如果存在就展示该图片，如果不存在就展示本地保存的名为 test 的图片
    NSMutableData * data = [[ NSUserDefaults standardUserDefaults ] objectForKey : @"imageu" ];
    if (data. length > 0 ) {
         Imageview. image = [ UIImage imageWithData :data];
    } else {

     Imageview. image = [ UIImage imageNamed : @"Test" ];
    }



// 下面这段代码，是调用 AFN 下载文件的方法，异步
    NSURLSessionConfiguration *configuration = [ NSURLSessionConfiguration defaultSessionConfiguration ];
    AFURLSessionManager *manager = [[ AFURLSessionManager alloc ] initWithSessionConfiguration :configuration];
    NSURL *URL = [ NSURL URLWithString : @"http://s16.sinaimg.cn/large/005vePOgzy70Rd3a9pJdf&690" ];
    NSURLRequest *request = [ NSURLRequest requestWithURL :URL];
    NSURLSessionDownloadTask *downloadTask = [manager downloadTaskWithRequest :request progress : nil destination :^ NSURL *( NSURL *targetPath, NSURLResponse *response) {

        NSURL *documentsDirectoryURL = [[ NSFileManager defaultManager ] URLForDirectory : NSDocumentDirectory inDomain : NSUserDomainMask appropriateForURL : nil create : NO error : nil ];
        return [documentsDirectoryURL URLByAppendingPathComponent :[response suggestedFilename ]];
    } completionHandler :^( NSURLResponse *response, NSURL *filePath, NSError *error) {
        NSLog ( @"File downloaded to: %@" , filePath);

        NSData * image = [ NSData dataWithContentsOfURL :filePath];
        [[ NSUserDefaults standardUserDefaults ] setObject :image forKey : @"imageu" ];


    }];
    [downloadTask resume ];


    // 这段代码，可以实现第二张图片有 3D 的动画效果，动画结束后，进行同步的网络请求，请求的是广告页图片
    [ UIView animateWithDuration :3 .0f delay : 0.0f options : UIViewAnimationOptionBeginFromCurrentState animations :^{

        //launchView.alpha = 0.0f;
        launchView. layer . transform = CATransform3DScale ( CATransform3DIdentity , 1.5f , 1.5f , 1.0f );
    } completion :^( BOOL finished) {


                NSString * ad_imgUrl = @"http://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E5%9B%BE%E7%89%87&pn=0&spn=0&di=125546894880&pi=&rn=1&tn=baiduimagedetail&ie=utf-8&oe=utf-8&cl=2&lm=-1&cs=1003704465%2C1400426357&os=4246966059%2C4277404619&simid=4210997991%2C798394471&adpicid=0&ln=30&fr=ala&fm=&sme=&cg=&bdtype=0&oriquery=&objurl=http%3A%2F%2Fpic25.nipic.com%2F20121112%2F5955207_224247025000_2.jpg&fromurl=ippr_z2C%24qAzdH3FAzdH3Fooo_z%26e3Bgtrtv_z%26e3Bv54AzdH3Ffi5oAzdH3FnAzdH3F0nAzdH3F0al8l0mhdj9v1c9n_z%26e3Bip4s&gsm=0" ;
                AppDelegate *appDelegate = ( AppDelegate *)[[ UIApplication sharedApplication ] delegate ];
                [ BBLaunchAdMonitor showAdAtPath :ad_imgUrl
                                         onView :appDelegate. window . rootViewController . view
                                   timeInterval : 5
                               detailParameters : @{ @"carId" : @(0001) , @"name" : @" 0007 " } ];
                   [launchView removeFromSuperview ];

}];