iphone - 进度条不显示 iphone 中的逐步进度

Question

大家好，我在我的应用程序中使用进度条来指示 xml 解析的状态。但它没有显示逐步更新，而是在整个 xml 解析结束后加载进度条，直到那个时候卡住了，没有显示任何进展。如何解决这个问题。谁能帮帮我。我使用下面的代码

IBOutlet UIProgressView * threadProgressView;

threadProgressView.progress = 0.0;
[self performSelectorOnMainThread:@selector(makeMyProgressBarMoving) withObject:nil waitUntilDone:NO];

- (void)makeMyProgressBarMoving
{
    float actual = [threadProgressView progress];
    if (actual < 1) {
        threadProgressView.progress = actual + ((float)1/(float)10);
        [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(makeMyProgressBarMoving) userInfo:nil repeats:NO];
    }
    else{
        /* something else */ 
    }
} 

Answer 1

1. 每 1/10 秒在主线程上创建一个计时器。让它达到你的“makeMyProgressBarMoving”功能。

   myTimer = [NSTimer scheduledTimerWithTimeInterval:.1 target:self selector:@selector(makeMyProgressBarMoving) userInfo:nil repeats:YES];
   

然后将您的函数编辑为如下所示:

- (void)makeMyProgressBarMoving {

      float actual = [threadProgressView progress];
      if (actual < 1) {
         threadProgressView.progress = actual + ((float)1/(float)10);
       return;
     }

    //if you got here that means the progress view is greater than 1 so now you can kill your timer that you had running every 1/10th of a second. 

    [myTimer invalidate];

}