ios - UIProgressView 未按预期更新

Question

遵循 this question 中概述的答案，我设法让 UIProgressView 有点工作，但它似乎在它应该之前完成更新(即栏“填满”)。

我尝试添加一些日志语句来查看发生了什么:

float actual = [_progressBar progress];

if (actual < 1) {
    _progressBar.progress = actual + ((float)numberOfFIlesAlreadyDownloaded/(float)numberOfFilesToBeDownloaded);

    NSLog(@"progress = %f", _progressBar.progress);
    NSLog(@"expected = %d", numberOfFilesToBeDownloaded);
    NSLog(@"received = %d", numberOfFIlesAlreadyDownloaded);
    NSLog(@"actual = %f", actual);

    [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(animateProgressBar) userInfo:nil repeats:NO];
}

输出:

 progress = 0.114286
 expected = 35
 received = 4
 actual = 0.000000
 progress = 0.285714
 expected = 35
 received = 6
 actual = 0.114286
 progress = 0.571429
 expected = 35
 received = 10
 actual = 0.285714
 progress = 0.857143
 expected = 35
 received = 10
 actual = 0.571429
 progress = 1.000000
 expected = 35
 received = 10
 actual = 0.857143 // this is the last output

这表明即使文件已经收到的值没有增加，进度仍在增加，我不明白为什么。

我有一种感觉，我错过了一些明显的东西，但如果有人能指出我做错了什么，我将不胜感激？谢谢。

Answer 1

假设 50% 的文件已下载，那么进度将为 0.5。接下来，如果下载有延迟，它仍然会根据 _progressBar.progress = effective + ((float)numberOfFIlesAlreadyDownloaded/(float)numberOfFilesToBeDownloaded);

添加

因此，请详细了解如何调用此函数，这将解决问题