指示器ActivityIndicatorView,俗称小菊花。进度条ProgressView不言而喻,就是显示进度的加载条。现在我们来模拟下载的过程。点击下面的Download按钮,使指示器ActivityIndicatorView动起来,并且使进度条ProgressView的进度每隔0.1s使进度加上1%,当进度达到100%时,停止指示器ActivityIndicatorView和进度条ProgressView。
//单击按钮触发的事件 - (IBAction)startProgress:(UIButton *)sender { //isDownloading初始状态为NO if(isDownloading==NO){ self.progressView.progress = 0; timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(startDownload) userInfo:nil repeats:YES]; NSLog(@"initialize timer finish"); isDownloading=YES; [self.indicator startAnimating]; } } //自定义模拟下载的事件,对应NSTimer绑定的事件 -(void)startDownload{ self.progressView.progress = self.progressView.progress + 0.01; NSLog(@"progress = %f",self.progressView.progress); if(self.progressView.progress==1){ [timer invalidate]; NSLog(@"download finish"); [self.indicator stopAnimating]; isDownloading=NO; } }