如何在 iOS 中每分钟重新加载一个视图？

Question

我有以下问题 - 我有一个收音机应用程序。我正在从 Web HTML 元素解析当前歌曲的标题并将其显示在标签中。我每分钟都在我的函数中用

NSTimer

加载这个元素，看看它是否已被更改。这是我的功能：

-(void)parsing
{
    NSURL *url = [NSURL URLWithString:@"http://live.radioeuphoria.bg:41232/played.html?sid=1"];
    NSData *webData = [NSData dataWithContentsOfURL:url];
    NSString *xPathQuery = @"//tr[2]/td[2]";
    TFHpple *parser = [TFHpple hppleWithHTMLData: webData];
    NSArray *array = [parser searchWithXPathQuery:xPathQuery];
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
    {
        CLTickerView *ticker = [[CLTickerView alloc] initWithFrame:CGRectMake(200, 798, 556, 50)]; // movable text
        for (TFHppleElement *element in array)
        {
            ticker.marqueeStr = [[element firstChild] content];
        }
    // ticker.marqueeStr = @"Current song's title";
        ticker.marqueeFont = [UIFont boldSystemFontOfSize:42];
        [self.view addSubview:ticker];
        NSLog(@"bla bla");
    }
    else
    {
        CLTickerView *ticker = [[CLTickerView alloc] initWithFrame:CGRectMake(86, 346, 230, 30)]; // movable text
        for (TFHppleElement *element in array)
        {
            ticker.marqueeStr = [[element firstChild] content];
        }
        ticker.marqueeFont = [UIFont boldSystemFontOfSize:22];
        [self.view addSubview:ticker];
        NSLog(@"bla bla");
    }
}

在我的

viewDidLoad

我这样做：

- (void)viewDidLoad
{
    [self parsing];
    timer = [NSTimer scheduledTimerWithTimeInterval:60.0 target:self selector:@selector(parsing) userInfo:nil repeats:YES];
    [super viewDidLoad];

}

以这种方式，标签每分钟都会出现在旧标签上，而不是替换它。如何用新视图替换我正在显示的旧视图 (

[self.view addSubview:ticker];

)？

Answer 1

一次参考这个

     -(void)parsing
        {
            NSURL *url = [NSURL URLWithString:@"http://live.radioeuphoria.bg:41232/played.html?sid=1"];
            NSData *webData = [NSData dataWithContentsOfURL:url];
            NSString *xPathQuery = @"//tr[2]/td[2]";
            TFHpple *parser = [TFHpple hppleWithHTMLData: webData];
            NSArray *array = [parser searchWithXPathQuery:xPathQuery];
            if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
            {
                CLTickerView *ticker = [[CLTickerView alloc] initWithFrame:CGRectMake(200, 798, 556, 50)]; 
    // here every time you are creating ticker that's why it overlaps remove this on here and add in viewDidload (define ticker globally). 

                for (TFHppleElement *element in array)
                {
                    ticker.marqueeStr = [[element firstChild] content];
                }
            // ticker.marqueeStr = @"Current song's title";
                ticker.marqueeFont = [UIFont boldSystemFontOfSize:42];
                [self.view addSubview:ticker];
                NSLog(@"bla bla");
            }
            else
            {
                CLTickerView *ticker = [[CLTickerView alloc] initWithFrame:CGRectMake(86, 346, 230, 30)];
 // here every time you are creating ticker that's why it overlaps remove this on here and add in viewDidload (define ticker globally).
                for (TFHppleElement *element in array)
                {
                    ticker.marqueeStr = [[element firstChild] content];
                }
                ticker.marqueeFont = [UIFont boldSystemFontOfSize:22];
                [self.view addSubview:ticker];
                NSLog(@"bla bla");
            }
        }