DownloadButton是可自定义的AppStore风格的下载按钮。可自定义设计组件，用IB进行编辑。使用示例：
#pragma mark - PKDownloadButtonDelegate- (void)downloadButtonTapped:(PKDownloadButton *)downloadButton currentState:(PKDownloadButtonState)state { switch (state) { case kPKDownloadButtonState_StartDownload: self.downloadButton.state = kPKDownloadButtonState_Pending; [self.pendingSimulator startDownload]; break; case kPKDownloadButtonState_Pending: [self.pendingSimulator cancelDownload]; self.downloadButton.state = kPKDownloadButtonState_StartDownload; break; case kPKDownloadButtonState_Downloading: [self.downloaderSimulator cancelDownload]; self.downloadButton.state = kPKDownloadButtonState_StartDownload; break; case kPKDownloadButtonState_Downloaded: self.downloadButton.state = kPKDownloadButtonState_StartDownload; self.imageView.hidden = YES; break; default: NSAssert(NO, @"unsupported state"); break; }}#pragma mark - DownloaderSimulatorDelegate- (void)simulator:(PKDownloaderSimulator *)simulator didUpdateProgress:(double)progress { if (simulator == self.pendingSimulator) { if (progress == 1.) { self.downloadButton.state = kPKDownloadButtonState_Downloading; [self.downloaderSimulator startDownload]; } } else if (simulator == self.downloaderSimulator) { self.downloadButton.stopDownloadButton.progress = progress; if (progress == 1) { self.downloadButton.state = kPKDownloadButtonState_Downloaded; self.imageView.hidden = NO; } }}
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