"美团"APP学习记录知识点

1.APP进入加载广告视图展示:

-(void)initAdvView{

// 判断图片是否已经存在
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
    NSString *filePath = [[paths objectAtIndex:] stringByAppendingPathComponent:[NSString stringWithFormat:@"loading.png"]];

    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL isDir = FALSE;
    BOOL isExit = [fileManager fileExistsAtPath:filePath isDirectory:&isDir];
    if (isExit) {
        NSLog(@"存在");
        _advImage = [[UIImageView alloc]initWithFrame:CGRectMake(, , screen_width, screen_height)];
//        [_advImage setImage:[UIImage imageNamed:@"loading.png"]];
        [_advImage setImage:[UIImage imageWithContentsOfFile:filePath]];
        [self.window addSubview:_advImage];
        [self performSelector:@selector(removeAdvImage) withObject:nil afterDelay:];

        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, ), ^{
            //加载启动广告并保存到本地沙盒，因为保存的图片较大，每次运行都要保存，所以注掉了
           // [self getLoadingImage];
        });
    }else{
        NSLog(@"不存在");
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, ), ^{
             // 不存在则网络请求,下载图片保存
            [self getLoadingImage];
        });
    }
}

// 图片移除
-(void)removeAdvImage{
    [UIView animateWithDuration:0.3f animations:^{
        _advImage.transform = CGAffineTransformMakeScale(0.5f, 0.5f);
        _advImage.alpha = .f;
    } completion:^(BOOL finished) {
        [_advImage removeFromSuperview];
    }];
}

网络获取图片:

//获取启动广告图片，采用后台推送时执行请求
-(void)getLoadingImage{
    //分辨率
    CGFloat scale_screen = [UIScreen mainScreen].scale;
    NSLog(@"%.0f    %.0f",screen_width*scale_screen,screen_height*scale_screen);
    int scaleW = (int)screen_width*scale_screen;
    int scaleH = (int)screen_height*scale_screen;

    NSString *urlStr = [NSString stringWithFormat:@"http://api.meituan.com/config/v1/loading/check.json?app_name=group&app_version=5.7&ci=1&city_id=1&client=iphone&movieBundleVersion=100&msid=48E2B810-805D-4821-9CDD-D5C9E01BC98A2015-07-15-15-51824&platform=iphone&resolution=%d%@%d&userid=10086&utm_campaign=AgroupBgroupD100Fa20141120nanning__m1__leftflow___ab_pindaochangsha__a__leftflow___ab_gxtest__gd__leftflow___ab_gxhceshi__nostrategy__leftflow___ab_i550poi_ktv__d__j___ab_chunceshishuju__a__a___ab_gxh_82__nostrategy__leftflow___ab_i_group_5_3_poidetaildeallist__a__b___b1junglehomepagecatesort__b__leftflow___ab_gxhceshi0202__b__a___ab_pindaoquxincelue0630__b__b1___ab_i550poi_xxyl__b__leftflow___ab_i_group_5_6_searchkuang__a__leftflow___i_group_5_2_deallist_poitype__d__d___ab_pindaoshenyang__a__leftflow___ab_b_food_57_purepoilist_extinfo__a__a___ab_waimaiwending__a__a___ab_waimaizhanshi__b__b1___ab_i550poi_lr__d__leftflow___ab_i_group_5_5_onsite__b__b___ab_xinkeceshi__b__leftflowGhomepage&utm_content=4B8C0B46F5B0527D55EA292904FD7E12E48FB7BEA8DF50BFE7828AF7F20BB08D&utm_medium=iphone&utm_source=AppStore&utm_term=5.7&uuid=4B8C0B46F5B0527D55EA292904FD7E12E48FB7BEA8DF50BFE7828AF7F20BB08D&version_name=5.7",scaleW,@"%2A",scaleH];

    [[NetworkSingleton sharedManager] getAdvLoadingImage:nil url:urlStr successBlock:^(id responseBody){
        NSLog(@"获取启动广告图片成功");
        NSMutableArray *dataArray = [responseBody objectForKey:@"data"];
        NSLog(@"dataArray:%@",dataArray);
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, ), ^{
            if (dataArray.count>) {
                NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:[dataArray[] objectForKey:@"imageUrl"]]];
                UIImage *image = [UIImage imageWithData:data];

                NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);

                NSString *filePath = [[paths objectAtIndex:] stringByAppendingPathComponent:[NSString stringWithFormat:@"loading.png"]];   // 保存文件的名称
                //    BOOL result = [UIImagePNGRepresentation() writeToFile: filePath    atomically:YES]; // 保存成功会返回YES
                NSLog(@"paths:%@    %@",paths,filePath);
                [UIImagePNGRepresentation(image) writeToFile:filePath atomically:YES];

            }
        });

    } failureBlock:^(NSString *error){
        NSLog(@"获取启动广告图片失败：%@",error);
    }];
}

2.刷新自定义gif图片:

-(void)setUpTableView{
    //添加下拉的动画图片
    //设置下拉刷新回调
    [self.tableView addGifHeaderWithRefreshingTarget:self refreshingAction:@selector(refreshData)];

    //设置普通状态的动画图片
    NSMutableArray *idleImages = [NSMutableArray array];
    for (NSUInteger i = ; i<=; ++i) {
        UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"dropdown_anim__000%zd",i]];
        [idleImages addObject:image];
    }
    [self.tableView.gifHeader setImages:idleImages forState:MJRefreshHeaderStateIdle];

    //设置即将刷新状态的动画图片
    NSMutableArray *refreshingImages = [NSMutableArray array];
    for (NSInteger i = ; i<=; i++) {
        UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"dropdown_loading_0%zd",i]];
        [refreshingImages addObject:image];
    }
    [self.tableView.gifHeader setImages:refreshingImages forState:MJRefreshHeaderStatePulling];

    //设置正在刷新是的动画图片
    [self.tableView.gifHeader setImages:refreshingImages forState:MJRefreshHeaderStateRefreshing];

    //马上进入刷新状态
    [self.tableView.gifHeader beginRefreshing];
}