2019獨角獸企業重金招聘Python工程師標準>>>

- (void) incrementBar: (id) timer {amountDone += 1.0f;[progressView setProgress: (amountDone / 20.0)];if (amountDone > 20.0){[self.actionSheet dismissWithClickedButtonIndex:0 animated:YES];self.actionSheet = nil;[timer invalidate];} }// Load the progress bar onto an actionsheet backing -(void) action: (UIBarButtonItem *) item {amountDone = 0.0f;self.actionSheet = [[[UIActionSheet alloc] initWithTitle:@"Downloading data. Please Wait\n\n\n" delegate:nil cancelButtonTitle:nil destructiveButtonTitle: nil otherButtonTitles: nil] autorelease];progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0.0f, 40.0f, 220.0f, 90.0f)];[progressView setProgressViewStyle: UIProgressViewStyleDefault];[actionSheet addSubview:progressView];[progressView release];// Create the demonstration updates[progressView setProgress:(amountDone = 0.0f)];[NSTimer scheduledTimerWithTimeInterval: 0.35 target: self selector:@selector(incrementBar:) userInfo: nil repeats: YES];[actionSheet showInView:self.view];progressView.center = CGPointMake(actionSheet.center.x, progressView.center.y); } 效果如下：

轉載于:https://my.oschina.net/u/936286/blog/131216

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