DownloadButton 介绍
DownloadButton 是可自定义的 App Store 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;
}
}
}
