Question

大家好我使用进度条指示我的应用程序中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，直到那时它是卡住了，没有任何进展。如何解决这个问题。任何人都可以帮助我。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

每隔1/10秒在主线程上创建一个计时器。让它击中你的“makeMyProgressBarMoving”功能。

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

然后编辑您的函数，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];

}

进度条没有显示iphone中的一步一步进展

1 个答案: