iOS QLPreviewController 预览pdf wo

iOS中预览文档可以使用QLPreviewController

创建一个QLPreviewController实例，设置数据源和代理

- (void)clickBtn:(UIButton *)btn {
    QLPreviewController *previewController = [[QLPreviewController alloc] init];
    previewController.dataSource = self;
    previewController.delegate = self;
    [self presentViewController:previewController animated:YES completion:nil];
    
}

实现协议方法

#pragma mark - QLPreviewControllerDataSource
- (NSInteger)numberOfPreviewItemsInPreviewController:(QLPreviewController *)controller {
    return 1;
}

- (id <QLPreviewItem>)previewController:(QLPreviewController *)controller previewItemAtIndex:(NSInteger)index {
    
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"iOS并发编程指南.pdf" ofType:nil];
    return [NSURL fileURLWithPath:filePath];
}

- (void)previewControllerWillDismiss:(QLPreviewController *)controller {
    NSLog(@"视图即将dismiss");
}